The Tor Browser: comparison intl/icu/source/i18n/unicode/decimfmt.h

--1:000000000000
+:68894be097fc
+/*
+********************************************************************************
+*   Copyright (C) 1997-2013, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+********************************************************************************
+*
+* File DECIMFMT.H
+*
+* Modification History:
+*
+*   Date        Name        Description
+*   02/19/97    aliu        Converted from java.
+*   03/20/97    clhuang     Updated per C++ implementation.
+*   04/03/97    aliu        Rewrote parsing and formatting completely, and
+*                           cleaned up and debugged.  Actually works now.
+*   04/17/97    aliu        Changed DigitCount to int per code review.
+*   07/10/97    helena      Made ParsePosition a class and get rid of the function
+*                           hiding problems.
+*   09/09/97    aliu        Ported over support for exponential formats.
+*   07/20/98    stephen     Changed documentation
+*   01/30/13    emmons      Added Scaling methods
+********************************************************************************
+*/
+#ifndef DECIMFMT_H
+#define DECIMFMT_H
+#include "unicode/utypes.h"
+/**
+* \file
+* \brief C++ API: Formats decimal numbers.
+*/
+#if !UCONFIG_NO_FORMATTING
+#include "unicode/dcfmtsym.h"
+#include "unicode/numfmt.h"
+#include "unicode/locid.h"
+#include "unicode/fpositer.h"
+#include "unicode/stringpiece.h"
+#include "unicode/curramt.h"
+#include "unicode/enumset.h"
+/**
+* \def UNUM_DECIMALFORMAT_INTERNAL_SIZE
+* @internal
+*/
+#if UCONFIG_FORMAT_FASTPATHS_49
+#define UNUM_DECIMALFORMAT_INTERNAL_SIZE 16
+#endif
+U_NAMESPACE_BEGIN
+class DigitList;
+class ChoiceFormat;
+class CurrencyPluralInfo;
+class Hashtable;
+class UnicodeSet;
+class FieldPositionHandler;
+class DecimalFormatStaticSets;
+class FixedDecimal;
+// explicit template instantiation. see digitlst.h
+#if defined (_MSC_VER)
+template class U_I18N_API    EnumSet<UNumberFormatAttribute,
+UNUM_MAX_NONBOOLEAN_ATTRIBUTE+1,
+UNUM_LIMIT_BOOLEAN_ATTRIBUTE>;
+#endif
+/**
+* DecimalFormat is a concrete subclass of NumberFormat that formats decimal
+* numbers. It has a variety of features designed to make it possible to parse
+* and format numbers in any locale, including support for Western, Arabic, or
+* Indic digits.  It also supports different flavors of numbers, including
+* integers ("123"), fixed-point numbers ("123.4"), scientific notation
+* ("1.23E4"), percentages ("12%"), and currency amounts ("$123", "USD123",
+* "123 US dollars").  All of these flavors can be easily localized.
+*
+* <p>To obtain a NumberFormat for a specific locale (including the default
+* locale) call one of NumberFormat's factory methods such as
+* createInstance(). Do not call the DecimalFormat constructors directly, unless
+* you know what you are doing, since the NumberFormat factory methods may
+* return subclasses other than DecimalFormat.
+*
+* <p><strong>Example Usage</strong>
+*
+* \code
+*     // Normally we would have a GUI with a menu for this
+*     int32_t locCount;
+*     const Locale* locales = NumberFormat::getAvailableLocales(locCount);
+*
+*     double myNumber = -1234.56;
+*     UErrorCode success = U_ZERO_ERROR;
+*     NumberFormat* form;
+*
+*     // Print out a number with the localized number, currency and percent
+*     // format for each locale.
+*     UnicodeString countryName;
+*     UnicodeString displayName;
+*     UnicodeString str;
+*     UnicodeString pattern;
+*     Formattable fmtable;
+*     for (int32_t j = 0; j < 3; ++j) {
+*         cout << endl << "FORMAT " << j << endl;
+*         for (int32_t i = 0; i < locCount; ++i) {
+*             if (locales[i].getCountry(countryName).size() == 0) {
+*                 // skip language-only
+*                 continue;
+*             }
+*             switch (j) {
+*             case 0:
+*                 form = NumberFormat::createInstance(locales[i], success ); break;
+*             case 1:
+*                 form = NumberFormat::createCurrencyInstance(locales[i], success ); break;
+*             default:
+*                 form = NumberFormat::createPercentInstance(locales[i], success ); break;
+*             }
+*             if (form) {
+*                 str.remove();
+*                 pattern = ((DecimalFormat*)form)->toPattern(pattern);
+*                 cout << locales[i].getDisplayName(displayName) << ": " << pattern;
+*                 cout << "  ->  " << form->format(myNumber,str) << endl;
+*                 form->parse(form->format(myNumber,str), fmtable, success);
+*                 delete form;
+*             }
+*         }
+*     }
+* \endcode
+* <P>
+* Another example use createInstance(style)
+* <P>
+* <pre>
+* <strong>// Print out a number using the localized number, currency,
+* // percent, scientific, integer, iso currency, and plural currency
+* // format for each locale</strong>
+* Locale* locale = new Locale("en", "US");
+* double myNumber = 1234.56;
+* UErrorCode success = U_ZERO_ERROR;
+* UnicodeString str;
+* Formattable fmtable;
+* for (int j=NumberFormat::kNumberStyle;
+*      j<=NumberFormat::kPluralCurrencyStyle;
+*      ++j) {
+*     NumberFormat* format = NumberFormat::createInstance(locale, j, success);
+*     str.remove();
+*     cout << "format result " << form->format(myNumber, str) << endl;
+*     format->parse(form->format(myNumber, str), fmtable, success);
+* }</pre>
+*
+*
+* <p><strong>Patterns</strong>
+*
+* <p>A DecimalFormat consists of a <em>pattern</em> and a set of
+* <em>symbols</em>.  The pattern may be set directly using
+* applyPattern(), or indirectly using other API methods which
+* manipulate aspects of the pattern, such as the minimum number of integer
+* digits.  The symbols are stored in a DecimalFormatSymbols
+* object.  When using the NumberFormat factory methods, the
+* pattern and symbols are read from ICU's locale data.
+*
+* <p><strong>Special Pattern Characters</strong>
+*
+* <p>Many characters in a pattern are taken literally; they are matched during
+* parsing and output unchanged during formatting.  Special characters, on the
+* other hand, stand for other characters, strings, or classes of characters.
+* For example, the '#' character is replaced by a localized digit.  Often the
+* replacement character is the same as the pattern character; in the U.S. locale,
+* the ',' grouping character is replaced by ','.  However, the replacement is
+* still happening, and if the symbols are modified, the grouping character
+* changes.  Some special characters affect the behavior of the formatter by
+* their presence; for example, if the percent character is seen, then the
+* value is multiplied by 100 before being displayed.
+*
+* <p>To insert a special character in a pattern as a literal, that is, without
+* any special meaning, the character must be quoted.  There are some exceptions to
+* this which are noted below.
+*
+* <p>The characters listed here are used in non-localized patterns.  Localized
+* patterns use the corresponding characters taken from this formatter's
+* DecimalFormatSymbols object instead, and these characters lose
+* their special status.  Two exceptions are the currency sign and quote, which
+* are not localized.
+*
+* <table border=0 cellspacing=3 cellpadding=0>
+*   <tr bgcolor="#ccccff">
+*     <td align=left><strong>Symbol</strong>
+*     <td align=left><strong>Location</strong>
+*     <td align=left><strong>Localized?</strong>
+*     <td align=left><strong>Meaning</strong>
+*   <tr valign=top>
+*     <td><code>0</code>
+*     <td>Number
+*     <td>Yes
+*     <td>Digit
+*   <tr valign=top bgcolor="#eeeeff">
+*     <td><code>1-9</code>
+*     <td>Number
+*     <td>Yes
+*     <td>'1' through '9' indicate rounding.
+*   <tr valign=top>
+*     <td><code>\htmlonly&#x40;\endhtmlonly</code> <!--doxygen doesn't like @-->
+*     <td>Number
+*     <td>No
+*     <td>Significant digit
+*   <tr valign=top bgcolor="#eeeeff">
+*     <td><code>#</code>
+*     <td>Number
+*     <td>Yes
+*     <td>Digit, zero shows as absent
+*   <tr valign=top>
+*     <td><code>.</code>
+*     <td>Number
+*     <td>Yes
+*     <td>Decimal separator or monetary decimal separator
+*   <tr valign=top bgcolor="#eeeeff">
+*     <td><code>-</code>
+*     <td>Number
+*     <td>Yes
+*     <td>Minus sign
+*   <tr valign=top>
+*     <td><code>,</code>
+*     <td>Number
+*     <td>Yes
+*     <td>Grouping separator
+*   <tr valign=top bgcolor="#eeeeff">
+*     <td><code>E</code>
+*     <td>Number
+*     <td>Yes
+*     <td>Separates mantissa and exponent in scientific notation.
+*         <em>Need not be quoted in prefix or suffix.</em>
+*   <tr valign=top>
+*     <td><code>+</code>
+*     <td>Exponent
+*     <td>Yes
+*     <td>Prefix positive exponents with localized plus sign.
+*         <em>Need not be quoted in prefix or suffix.</em>
+*   <tr valign=top bgcolor="#eeeeff">
+*     <td><code>;</code>
+*     <td>Subpattern boundary
+*     <td>Yes
+*     <td>Separates positive and negative subpatterns
+*   <tr valign=top>
+*     <td><code>\%</code>
+*     <td>Prefix or suffix
+*     <td>Yes
+*     <td>Multiply by 100 and show as percentage
+*   <tr valign=top bgcolor="#eeeeff">
+*     <td><code>\\u2030</code>
+*     <td>Prefix or suffix
+*     <td>Yes
+*     <td>Multiply by 1000 and show as per mille
+*   <tr valign=top>
+*     <td><code>\htmlonly&curren;\endhtmlonly</code> (<code>\\u00A4</code>)
+*     <td>Prefix or suffix
+*     <td>No
+*     <td>Currency sign, replaced by currency symbol.  If
+*         doubled, replaced by international currency symbol.
+*         If tripled, replaced by currency plural names, for example,
+*         "US dollar" or "US dollars" for America.
+*         If present in a pattern, the monetary decimal separator
+*         is used instead of the decimal separator.
+*   <tr valign=top bgcolor="#eeeeff">
+*     <td><code>'</code>
+*     <td>Prefix or suffix
+*     <td>No
+*     <td>Used to quote special characters in a prefix or suffix,
+*         for example, <code>"'#'#"</code> formats 123 to
+*         <code>"#123"</code>.  To create a single quote
+*         itself, use two in a row: <code>"# o''clock"</code>.
+*   <tr valign=top>
+*     <td><code>*</code>
+*     <td>Prefix or suffix boundary
+*     <td>Yes
+*     <td>Pad escape, precedes pad character
+* </table>
+*
+* <p>A DecimalFormat pattern contains a postive and negative
+* subpattern, for example, "#,##0.00;(#,##0.00)".  Each subpattern has a
+* prefix, a numeric part, and a suffix.  If there is no explicit negative
+* subpattern, the negative subpattern is the localized minus sign prefixed to the
+* positive subpattern. That is, "0.00" alone is equivalent to "0.00;-0.00".  If there
+* is an explicit negative subpattern, it serves only to specify the negative
+* prefix and suffix; the number of digits, minimal digits, and other
+* characteristics are ignored in the negative subpattern. That means that
+* "#,##0.0#;(#)" has precisely the same result as "#,##0.0#;(#,##0.0#)".
+*
+* <p>The prefixes, suffixes, and various symbols used for infinity, digits,
+* thousands separators, decimal separators, etc. may be set to arbitrary
+* values, and they will appear properly during formatting.  However, care must
+* be taken that the symbols and strings do not conflict, or parsing will be
+* unreliable.  For example, either the positive and negative prefixes or the
+* suffixes must be distinct for parse() to be able
+* to distinguish positive from negative values.  Another example is that the
+* decimal separator and thousands separator should be distinct characters, or
+* parsing will be impossible.
+*
+* <p>The <em>grouping separator</em> is a character that separates clusters of
+* integer digits to make large numbers more legible.  It commonly used for
+* thousands, but in some locales it separates ten-thousands.  The <em>grouping
+* size</em> is the number of digits between the grouping separators, such as 3
+* for "100,000,000" or 4 for "1 0000 0000". There are actually two different
+* grouping sizes: One used for the least significant integer digits, the
+* <em>primary grouping size</em>, and one used for all others, the
+* <em>secondary grouping size</em>.  In most locales these are the same, but
+* sometimes they are different. For example, if the primary grouping interval
+* is 3, and the secondary is 2, then this corresponds to the pattern
+* "#,##,##0", and the number 123456789 is formatted as "12,34,56,789".  If a
+* pattern contains multiple grouping separators, the interval between the last
+* one and the end of the integer defines the primary grouping size, and the
+* interval between the last two defines the secondary grouping size. All others
+* are ignored, so "#,##,###,####" == "###,###,####" == "##,#,###,####".
+*
+* <p>Illegal patterns, such as "#.#.#" or "#.###,###", will cause
+* DecimalFormat to set a failing UErrorCode.
+*
+* <p><strong>Pattern BNF</strong>
+*
+* <pre>
+* pattern    := subpattern (';' subpattern)?
+* subpattern := prefix? number exponent? suffix?
+* number     := (integer ('.' fraction)?) | sigDigits
+* prefix     := '\\u0000'..'\\uFFFD' - specialCharacters
+* suffix     := '\\u0000'..'\\uFFFD' - specialCharacters
+* integer    := '#'* '0'* '0'
+* fraction   := '0'* '#'*
+* sigDigits  := '#'* '@' '@'* '#'*
+* exponent   := 'E' '+'? '0'* '0'
+* padSpec    := '*' padChar
+* padChar    := '\\u0000'..'\\uFFFD' - quote
+* &nbsp;
+* Notation:
+*   X*       0 or more instances of X
+*   X?       0 or 1 instances of X
+*   X|Y      either X or Y
+*   C..D     any character from C up to D, inclusive
+*   S-T      characters in S, except those in T
+* </pre>
+* The first subpattern is for positive numbers. The second (optional)
+* subpattern is for negative numbers.
+*
+* <p>Not indicated in the BNF syntax above:
+*
+* <ul><li>The grouping separator ',' can occur inside the integer and
+* sigDigits elements, between any two pattern characters of that
+* element, as long as the integer or sigDigits element is not
+* followed by the exponent element.
+*
+* <li>Two grouping intervals are recognized: That between the
+*     decimal point and the first grouping symbol, and that
+*     between the first and second grouping symbols. These
+*     intervals are identical in most locales, but in some
+*     locales they differ. For example, the pattern
+*     &quot;#,##,###&quot; formats the number 123456789 as
+*     &quot;12,34,56,789&quot;.</li>
+*
+* <li>The pad specifier <code>padSpec</code> may appear before the prefix,
+* after the prefix, before the suffix, after the suffix, or not at all.
+*
+* <li>In place of '0', the digits '1' through '9' may be used to
+* indicate a rounding increment.
+* </ul>
+*
+* <p><strong>Parsing</strong>
+*
+* <p>DecimalFormat parses all Unicode characters that represent
+* decimal digits, as defined by u_charDigitValue().  In addition,
+* DecimalFormat also recognizes as digits the ten consecutive
+* characters starting with the localized zero digit defined in the
+* DecimalFormatSymbols object.  During formatting, the
+* DecimalFormatSymbols-based digits are output.
+*
+* <p>During parsing, grouping separators are ignored if in lenient mode;
+* otherwise, if present, they must be in appropriate positions.
+*
+* <p>For currency parsing, the formatter is able to parse every currency
+* style formats no matter which style the formatter is constructed with.
+* For example, a formatter instance gotten from
+* NumberFormat.getInstance(ULocale, NumberFormat.CURRENCYSTYLE) can parse
+* formats such as "USD1.00" and "3.00 US dollars".
+*
+* <p>If parse(UnicodeString&,Formattable&,ParsePosition&)
+* fails to parse a string, it leaves the parse position unchanged.
+* The convenience method parse(UnicodeString&,Formattable&,UErrorCode&)
+* indicates parse failure by setting a failing
+* UErrorCode.
+*
+* <p><strong>Formatting</strong>
+*
+* <p>Formatting is guided by several parameters, all of which can be
+* specified either using a pattern or using the API.  The following
+* description applies to formats that do not use <a href="#sci">scientific
+* notation</a> or <a href="#sigdig">significant digits</a>.
+*
+* <ul><li>If the number of actual integer digits exceeds the
+* <em>maximum integer digits</em>, then only the least significant
+* digits are shown.  For example, 1997 is formatted as "97" if the
+* maximum integer digits is set to 2.
+*
+* <li>If the number of actual integer digits is less than the
+* <em>minimum integer digits</em>, then leading zeros are added.  For
+* example, 1997 is formatted as "01997" if the minimum integer digits
+* is set to 5.
+*
+* <li>If the number of actual fraction digits exceeds the <em>maximum
+* fraction digits</em>, then rounding is performed to the
+* maximum fraction digits.  For example, 0.125 is formatted as "0.12"
+* if the maximum fraction digits is 2.  This behavior can be changed
+* by specifying a rounding increment and/or a rounding mode.
+*
+* <li>If the number of actual fraction digits is less than the
+* <em>minimum fraction digits</em>, then trailing zeros are added.
+* For example, 0.125 is formatted as "0.1250" if the mimimum fraction
+* digits is set to 4.
+*
+* <li>Trailing fractional zeros are not displayed if they occur
+* <em>j</em> positions after the decimal, where <em>j</em> is less
+* than the maximum fraction digits. For example, 0.10004 is
+* formatted as "0.1" if the maximum fraction digits is four or less.
+* </ul>
+*
+* <p><strong>Special Values</strong>
+*
+* <p><code>NaN</code> is represented as a single character, typically
+* <code>\\uFFFD</code>.  This character is determined by the
+* DecimalFormatSymbols object.  This is the only value for which
+* the prefixes and suffixes are not used.
+*
+* <p>Infinity is represented as a single character, typically
+* <code>\\u221E</code>, with the positive or negative prefixes and suffixes
+* applied.  The infinity character is determined by the
+* DecimalFormatSymbols object.
+*
+* <a name="sci"><strong>Scientific Notation</strong></a>
+*
+* <p>Numbers in scientific notation are expressed as the product of a mantissa
+* and a power of ten, for example, 1234 can be expressed as 1.234 x 10<sup>3</sup>. The
+* mantissa is typically in the half-open interval [1.0, 10.0) or sometimes [0.0, 1.0),
+* but it need not be.  DecimalFormat supports arbitrary mantissas.
+* DecimalFormat can be instructed to use scientific
+* notation through the API or through the pattern.  In a pattern, the exponent
+* character immediately followed by one or more digit characters indicates
+* scientific notation.  Example: "0.###E0" formats the number 1234 as
+* "1.234E3".
+*
+* <ul>
+* <li>The number of digit characters after the exponent character gives the
+* minimum exponent digit count.  There is no maximum.  Negative exponents are
+* formatted using the localized minus sign, <em>not</em> the prefix and suffix
+* from the pattern.  This allows patterns such as "0.###E0 m/s".  To prefix
+* positive exponents with a localized plus sign, specify '+' between the
+* exponent and the digits: "0.###E+0" will produce formats "1E+1", "1E+0",
+* "1E-1", etc.  (In localized patterns, use the localized plus sign rather than
+* '+'.)
+*
+* <li>The minimum number of integer digits is achieved by adjusting the
+* exponent.  Example: 0.00123 formatted with "00.###E0" yields "12.3E-4".  This
+* only happens if there is no maximum number of integer digits.  If there is a
+* maximum, then the minimum number of integer digits is fixed at one.
+*
+* <li>The maximum number of integer digits, if present, specifies the exponent
+* grouping.  The most common use of this is to generate <em>engineering
+* notation</em>, in which the exponent is a multiple of three, e.g.,
+* "##0.###E0".  The number 12345 is formatted using "##0.####E0" as "12.345E3".
+*
+* <li>When using scientific notation, the formatter controls the
+* digit counts using significant digits logic.  The maximum number of
+* significant digits limits the total number of integer and fraction
+* digits that will be shown in the mantissa; it does not affect
+* parsing.  For example, 12345 formatted with "##0.##E0" is "12.3E3".
+* See the section on significant digits for more details.
+*
+* <li>The number of significant digits shown is determined as
+* follows: If areSignificantDigitsUsed() returns false, then the
+* minimum number of significant digits shown is one, and the maximum
+* number of significant digits shown is the sum of the <em>minimum
+* integer</em> and <em>maximum fraction</em> digits, and is
+* unaffected by the maximum integer digits.  If this sum is zero,
+* then all significant digits are shown.  If
+* areSignificantDigitsUsed() returns true, then the significant digit
+* counts are specified by getMinimumSignificantDigits() and
+* getMaximumSignificantDigits().  In this case, the number of
+* integer digits is fixed at one, and there is no exponent grouping.
+*
+* <li>Exponential patterns may not contain grouping separators.
+* </ul>
+*
+* <a name="sigdig"><strong>Significant Digits</strong></a>
+*
+* <code>DecimalFormat</code> has two ways of controlling how many
+* digits are shows: (a) significant digits counts, or (b) integer and
+* fraction digit counts.  Integer and fraction digit counts are
+* described above.  When a formatter is using significant digits
+* counts, the number of integer and fraction digits is not specified
+* directly, and the formatter settings for these counts are ignored.
+* Instead, the formatter uses however many integer and fraction
+* digits are required to display the specified number of significant
+* digits.  Examples:
+*
+* <table border=0 cellspacing=3 cellpadding=0>
+*   <tr bgcolor="#ccccff">
+*     <td align=left>Pattern
+*     <td align=left>Minimum significant digits
+*     <td align=left>Maximum significant digits
+*     <td align=left>Number
+*     <td align=left>Output of format()
+*   <tr valign=top>
+*     <td><code>\@\@\@</code>
+*     <td>3
+*     <td>3
+*     <td>12345
+*     <td><code>12300</code>
+*   <tr valign=top bgcolor="#eeeeff">
+*     <td><code>\@\@\@</code>
+*     <td>3
+*     <td>3
+*     <td>0.12345
+*     <td><code>0.123</code>
+*   <tr valign=top>
+*     <td><code>\@\@##</code>
+*     <td>2
+*     <td>4
+*     <td>3.14159
+*     <td><code>3.142</code>
+*   <tr valign=top bgcolor="#eeeeff">
+*     <td><code>\@\@##</code>
+*     <td>2
+*     <td>4
+*     <td>1.23004
+*     <td><code>1.23</code>
+* </table>
+*
+* <ul>
+* <li>Significant digit counts may be expressed using patterns that
+* specify a minimum and maximum number of significant digits.  These
+* are indicated by the <code>'@'</code> and <code>'#'</code>
+* characters.  The minimum number of significant digits is the number
+* of <code>'@'</code> characters.  The maximum number of significant
+* digits is the number of <code>'@'</code> characters plus the number
+* of <code>'#'</code> characters following on the right.  For
+* example, the pattern <code>"@@@"</code> indicates exactly 3
+* significant digits.  The pattern <code>"@##"</code> indicates from
+* 1 to 3 significant digits.  Trailing zero digits to the right of
+* the decimal separator are suppressed after the minimum number of
+* significant digits have been shown.  For example, the pattern
+* <code>"@##"</code> formats the number 0.1203 as
+* <code>"0.12"</code>.
+*
+* <li>If a pattern uses significant digits, it may not contain a
+* decimal separator, nor the <code>'0'</code> pattern character.
+* Patterns such as <code>"@00"</code> or <code>"@.###"</code> are
+* disallowed.
+*
+* <li>Any number of <code>'#'</code> characters may be prepended to
+* the left of the leftmost <code>'@'</code> character.  These have no
+* effect on the minimum and maximum significant digits counts, but
+* may be used to position grouping separators.  For example,
+* <code>"#,#@#"</code> indicates a minimum of one significant digits,
+* a maximum of two significant digits, and a grouping size of three.
+*
+* <li>In order to enable significant digits formatting, use a pattern
+* containing the <code>'@'</code> pattern character.  Alternatively,
+* call setSignificantDigitsUsed(TRUE).
+*
+* <li>In order to disable significant digits formatting, use a
+* pattern that does not contain the <code>'@'</code> pattern
+* character. Alternatively, call setSignificantDigitsUsed(FALSE).
+*
+* <li>The number of significant digits has no effect on parsing.
+*
+* <li>Significant digits may be used together with exponential notation. Such
+* patterns are equivalent to a normal exponential pattern with a minimum and
+* maximum integer digit count of one, a minimum fraction digit count of
+* <code>getMinimumSignificantDigits() - 1</code>, and a maximum fraction digit
+* count of <code>getMaximumSignificantDigits() - 1</code>. For example, the
+* pattern <code>"@@###E0"</code> is equivalent to <code>"0.0###E0"</code>.
+*
+* <li>If signficant digits are in use, then the integer and fraction
+* digit counts, as set via the API, are ignored.  If significant
+* digits are not in use, then the signficant digit counts, as set via
+* the API, are ignored.
+*
+* </ul>
+*
+* <p><strong>Padding</strong>
+*
+* <p>DecimalFormat supports padding the result of
+* format() to a specific width.  Padding may be specified either
+* through the API or through the pattern syntax.  In a pattern the pad escape
+* character, followed by a single pad character, causes padding to be parsed
+* and formatted.  The pad escape character is '*' in unlocalized patterns, and
+* can be localized using DecimalFormatSymbols::setSymbol() with a
+* DecimalFormatSymbols::kPadEscapeSymbol
+* selector.  For example, <code>"$*x#,##0.00"</code> formats 123 to
+* <code>"$xx123.00"</code>, and 1234 to <code>"$1,234.00"</code>.
+*
+* <ul>
+* <li>When padding is in effect, the width of the positive subpattern,
+* including prefix and suffix, determines the format width.  For example, in
+* the pattern <code>"* #0 o''clock"</code>, the format width is 10.
+*
+* <li>The width is counted in 16-bit code units (UChars).
+*
+* <li>Some parameters which usually do not matter have meaning when padding is
+* used, because the pattern width is significant with padding.  In the pattern
+* "* ##,##,#,##0.##", the format width is 14.  The initial characters "##,##,"
+* do not affect the grouping size or maximum integer digits, but they do affect
+* the format width.
+*
+* <li>Padding may be inserted at one of four locations: before the prefix,
+* after the prefix, before the suffix, or after the suffix.  If padding is
+* specified in any other location, applyPattern()
+* sets a failing UErrorCode.  If there is no prefix,
+* before the prefix and after the prefix are equivalent, likewise for the
+* suffix.
+*
+* <li>When specified in a pattern, the 32-bit code point immediately
+* following the pad escape is the pad character. This may be any character,
+* including a special pattern character. That is, the pad escape
+* <em>escapes</em> the following character. If there is no character after
+* the pad escape, then the pattern is illegal.
+*
+* </ul>
+*
+* <p><strong>Rounding</strong>
+*
+* <p>DecimalFormat supports rounding to a specific increment.  For
+* example, 1230 rounded to the nearest 50 is 1250.  1.234 rounded to the
+* nearest 0.65 is 1.3.  The rounding increment may be specified through the API
+* or in a pattern.  To specify a rounding increment in a pattern, include the
+* increment in the pattern itself.  "#,#50" specifies a rounding increment of
+* 50.  "#,##0.05" specifies a rounding increment of 0.05.
+*
+* <p>In the absense of an explicit rounding increment numbers are
+* rounded to their formatted width.
+*
+* <ul>
+* <li>Rounding only affects the string produced by formatting.  It does
+* not affect parsing or change any numerical values.
+*
+* <li>A <em>rounding mode</em> determines how values are rounded; see
+* DecimalFormat::ERoundingMode.  The default rounding mode is
+* DecimalFormat::kRoundHalfEven.  The rounding mode can only be set
+* through the API; it can not be set with a pattern.
+*
+* <li>Some locales use rounding in their currency formats to reflect the
+* smallest currency denomination.
+*
+* <li>In a pattern, digits '1' through '9' specify rounding, but otherwise
+* behave identically to digit '0'.
+* </ul>
+*
+* <p><strong>Synchronization</strong>
+*
+* <p>DecimalFormat objects are not synchronized.  Multiple
+* threads should not access one formatter concurrently.
+*
+* <p><strong>Subclassing</strong>
+*
+* <p><em>User subclasses are not supported.</em> While clients may write
+* subclasses, such code will not necessarily work and will not be
+* guaranteed to work stably from release to release.
+*/
+class U_I18N_API DecimalFormat: public NumberFormat {
+public:
+/**
+* Rounding mode.
+* @stable ICU 2.4
+*/
+enum ERoundingMode {
+kRoundCeiling,  /**< Round towards positive infinity */
+kRoundFloor,    /**< Round towards negative infinity */
+kRoundDown,     /**< Round towards zero */
+kRoundUp,       /**< Round away from zero */
+kRoundHalfEven, /**< Round towards the nearest integer, or
+towards the nearest even integer if equidistant */
+kRoundHalfDown, /**< Round towards the nearest integer, or
+towards zero if equidistant */
+kRoundHalfUp,   /**< Round towards the nearest integer, or
+away from zero if equidistant */
+/**
+*  Return U_FORMAT_INEXACT_ERROR if number does not format exactly.
+*  @stable ICU 4.8
+*/
+kRoundUnnecessary
+};
+/**
+* Pad position.
+* @stable ICU 2.4
+*/
+enum EPadPosition {
+kPadBeforePrefix,
+kPadAfterPrefix,
+kPadBeforeSuffix,
+kPadAfterSuffix
+};
+/**
+* Create a DecimalFormat using the default pattern and symbols
+* for the default locale. This is a convenient way to obtain a
+* DecimalFormat when internationalization is not the main concern.
+* <P>
+* To obtain standard formats for a given locale, use the factory methods
+* on NumberFormat such as createInstance. These factories will
+* return the most appropriate sub-class of NumberFormat for a given
+* locale.
+* @param status    Output param set to success/failure code. If the
+*                  pattern is invalid this will be set to a failure code.
+* @stable ICU 2.0
+*/
+DecimalFormat(UErrorCode& status);
+/**
+* Create a DecimalFormat from the given pattern and the symbols
+* for the default locale. This is a convenient way to obtain a
+* DecimalFormat when internationalization is not the main concern.
+* <P>
+* To obtain standard formats for a given locale, use the factory methods
+* on NumberFormat such as createInstance. These factories will
+* return the most appropriate sub-class of NumberFormat for a given
+* locale.
+* @param pattern   A non-localized pattern string.
+* @param status    Output param set to success/failure code. If the
+*                  pattern is invalid this will be set to a failure code.
+* @stable ICU 2.0
+*/
+DecimalFormat(const UnicodeString& pattern,
+UErrorCode& status);
+/**
+* Create a DecimalFormat from the given pattern and symbols.
+* Use this constructor when you need to completely customize the
+* behavior of the format.
+* <P>
+* To obtain standard formats for a given
+* locale, use the factory methods on NumberFormat such as
+* createInstance or createCurrencyInstance. If you need only minor adjustments
+* to a standard format, you can modify the format returned by
+* a NumberFormat factory method.
+*
+* @param pattern           a non-localized pattern string
+* @param symbolsToAdopt    the set of symbols to be used.  The caller should not
+*                          delete this object after making this call.
+* @param status            Output param set to success/failure code. If the
+*                          pattern is invalid this will be set to a failure code.
+* @stable ICU 2.0
+*/
+DecimalFormat(  const UnicodeString& pattern,
+DecimalFormatSymbols* symbolsToAdopt,
+UErrorCode& status);
+#ifndef U_HIDE_INTERNAL_API
+/**
+* This API is for ICU use only.
+* Create a DecimalFormat from the given pattern, symbols, and style.
+*
+* @param pattern           a non-localized pattern string
+* @param symbolsToAdopt    the set of symbols to be used.  The caller should not
+*                          delete this object after making this call.
+* @param style             style of decimal format
+* @param status            Output param set to success/failure code. If the
+*                          pattern is invalid this will be set to a failure code.
+* @internal
+*/
+DecimalFormat(  const UnicodeString& pattern,
+DecimalFormatSymbols* symbolsToAdopt,
+UNumberFormatStyle style,
+UErrorCode& status);
+#if UCONFIG_HAVE_PARSEALLINPUT
+/**
+* @internal
+*/
+void setParseAllInput(UNumberFormatAttributeValue value);
+#endif
+#endif  /* U_HIDE_INTERNAL_API */
+/**
+* Set an integer attribute on this DecimalFormat.
+* May return U_UNSUPPORTED_ERROR if this instance does not support
+* the specified attribute.
+* @param attr the attribute to set
+* @param newvalue new value
+* @param status the error type
+* @return *this - for chaining (example: format.setAttribute(...).setAttribute(...) )
+* @draft ICU 51
+*/
+virtual DecimalFormat& setAttribute( UNumberFormatAttribute attr,
+int32_t newvalue,
+UErrorCode &status);
+/**
+* Get an integer
+* May return U_UNSUPPORTED_ERROR if this instance does not support
+* the specified attribute.
+* @param attr the attribute to set
+* @param status the error type
+* @return the attribute value. Undefined if there is an error.
+* @draft ICU 51
+*/
+virtual int32_t getAttribute( UNumberFormatAttribute attr,
+UErrorCode &status) const;
+/**
+* Create a DecimalFormat from the given pattern and symbols.
+* Use this constructor when you need to completely customize the
+* behavior of the format.
+* <P>
+* To obtain standard formats for a given
+* locale, use the factory methods on NumberFormat such as
+* createInstance or createCurrencyInstance. If you need only minor adjustments
+* to a standard format, you can modify the format returned by
+* a NumberFormat factory method.
+*
+* @param pattern           a non-localized pattern string
+* @param symbolsToAdopt    the set of symbols to be used.  The caller should not
+*                          delete this object after making this call.
+* @param parseError        Output param to receive errors occured during parsing
+* @param status            Output param set to success/failure code. If the
+*                          pattern is invalid this will be set to a failure code.
+* @stable ICU 2.0
+*/
+DecimalFormat(  const UnicodeString& pattern,
+DecimalFormatSymbols* symbolsToAdopt,
+UParseError& parseError,
+UErrorCode& status);
+/**
+* Create a DecimalFormat from the given pattern and symbols.
+* Use this constructor when you need to completely customize the
+* behavior of the format.
+* <P>
+* To obtain standard formats for a given
+* locale, use the factory methods on NumberFormat such as
+* createInstance or createCurrencyInstance. If you need only minor adjustments
+* to a standard format, you can modify the format returned by
+* a NumberFormat factory method.
+*
+* @param pattern           a non-localized pattern string
+* @param symbols   the set of symbols to be used
+* @param status            Output param set to success/failure code. If the
+*                          pattern is invalid this will be set to a failure code.
+* @stable ICU 2.0
+*/
+DecimalFormat(  const UnicodeString& pattern,
+const DecimalFormatSymbols& symbols,
+UErrorCode& status);
+/**
+* Copy constructor.
+*
+* @param source    the DecimalFormat object to be copied from.
+* @stable ICU 2.0
+*/
+DecimalFormat(const DecimalFormat& source);
+/**
+* Assignment operator.
+*
+* @param rhs    the DecimalFormat object to be copied.
+* @stable ICU 2.0
+*/
+DecimalFormat& operator=(const DecimalFormat& rhs);
+/**
+* Destructor.
+* @stable ICU 2.0
+*/
+virtual ~DecimalFormat();
+/**
+* Clone this Format object polymorphically. The caller owns the
+* result and should delete it when done.
+*
+* @return    a polymorphic copy of this DecimalFormat.
+* @stable ICU 2.0
+*/
+virtual Format* clone(void) const;
+/**
+* Return true if the given Format objects are semantically equal.
+* Objects of different subclasses are considered unequal.
+*
+* @param other    the object to be compared with.
+* @return         true if the given Format objects are semantically equal.
+* @stable ICU 2.0
+*/
+virtual UBool operator==(const Format& other) const;
+using NumberFormat::format;
+/**
+* Format a double or long number using base-10 representation.
+*
+* @param number    The value to be formatted.
+* @param appendTo  Output parameter to receive result.
+*                  Result is appended to existing contents.
+* @param pos       On input: an alignment field, if desired.
+*                  On output: the offsets of the alignment field.
+* @return          Reference to 'appendTo' parameter.
+* @stable ICU 2.0
+*/
+virtual UnicodeString& format(double number,
+UnicodeString& appendTo,
+FieldPosition& pos) const;
+/**
+* Format a double or long number using base-10 representation.
+*
+* @param number    The value to be formatted.
+* @param appendTo  Output parameter to receive result.
+*                  Result is appended to existing contents.
+* @param pos       On input: an alignment field, if desired.
+*                  On output: the offsets of the alignment field.
+* @param status
+* @return          Reference to 'appendTo' parameter.
+* @internal
+*/
+virtual UnicodeString& format(double number,
+UnicodeString& appendTo,
+FieldPosition& pos,
+UErrorCode &status) const;
+/**
+* Format a double or long number using base-10 representation.
+*
+* @param number    The value to be formatted.
+* @param appendTo  Output parameter to receive result.
+*                  Result is appended to existing contents.
+* @param posIter   On return, can be used to iterate over positions
+*                  of fields generated by this format call.
+*                  Can be NULL.
+* @param status    Output param filled with success/failure status.
+* @return          Reference to 'appendTo' parameter.
+* @stable 4.4
+*/
+virtual UnicodeString& format(double number,
+UnicodeString& appendTo,
+FieldPositionIterator* posIter,
+UErrorCode& status) const;
+/**
+* Format a long number using base-10 representation.
+*
+* @param number    The value to be formatted.
+* @param appendTo  Output parameter to receive result.
+*                  Result is appended to existing contents.
+* @param pos       On input: an alignment field, if desired.
+*                  On output: the offsets of the alignment field.
+* @return          Reference to 'appendTo' parameter.
+* @stable ICU 2.0
+*/
+virtual UnicodeString& format(int32_t number,
+UnicodeString& appendTo,
+FieldPosition& pos) const;
+/**
+* Format a long number using base-10 representation.
+*
+* @param number    The value to be formatted.
+* @param appendTo  Output parameter to receive result.
+*                  Result is appended to existing contents.
+* @param pos       On input: an alignment field, if desired.
+*                  On output: the offsets of the alignment field.
+* @return          Reference to 'appendTo' parameter.
+* @internal
+*/
+virtual UnicodeString& format(int32_t number,
+UnicodeString& appendTo,
+FieldPosition& pos,
+UErrorCode &status) const;
+/**
+* Format a long number using base-10 representation.
+*
+* @param number    The value to be formatted.
+* @param appendTo  Output parameter to receive result.
+*                  Result is appended to existing contents.
+* @param posIter   On return, can be used to iterate over positions
+*                  of fields generated by this format call.
+*                  Can be NULL.
+* @param status    Output param filled with success/failure status.
+* @return          Reference to 'appendTo' parameter.
+* @stable 4.4
+*/
+virtual UnicodeString& format(int32_t number,
+UnicodeString& appendTo,
+FieldPositionIterator* posIter,
+UErrorCode& status) const;
+/**
+* Format an int64 number using base-10 representation.
+*
+* @param number    The value to be formatted.
+* @param appendTo  Output parameter to receive result.
+*                  Result is appended to existing contents.
+* @param pos       On input: an alignment field, if desired.
+*                  On output: the offsets of the alignment field.
+* @return          Reference to 'appendTo' parameter.
+* @stable ICU 2.8
+*/
+virtual UnicodeString& format(int64_t number,
+UnicodeString& appendTo,
+FieldPosition& pos) const;
+/**
+* Format an int64 number using base-10 representation.
+*
+* @param number    The value to be formatted.
+* @param appendTo  Output parameter to receive result.
+*                  Result is appended to existing contents.
+* @param pos       On input: an alignment field, if desired.
+*                  On output: the offsets of the alignment field.
+* @return          Reference to 'appendTo' parameter.
+* @internal
+*/
+virtual UnicodeString& format(int64_t number,
+UnicodeString& appendTo,
+FieldPosition& pos,
+UErrorCode &status) const;
+/**
+* Format an int64 number using base-10 representation.
+*
+* @param number    The value to be formatted.
+* @param appendTo  Output parameter to receive result.
+*                  Result is appended to existing contents.
+* @param posIter   On return, can be used to iterate over positions
+*                  of fields generated by this format call.
+*                  Can be NULL.
+* @param status    Output param filled with success/failure status.
+* @return          Reference to 'appendTo' parameter.
+* @stable 4.4
+*/
+virtual UnicodeString& format(int64_t number,
+UnicodeString& appendTo,
+FieldPositionIterator* posIter,
+UErrorCode& status) const;
+/**
+* Format a decimal number.
+* The syntax of the unformatted number is a "numeric string"
+* as defined in the Decimal Arithmetic Specification, available at
+* http://speleotrove.com/decimal
+*
+* @param number    The unformatted number, as a string.
+* @param appendTo  Output parameter to receive result.
+*                  Result is appended to existing contents.
+* @param posIter   On return, can be used to iterate over positions
+*                  of fields generated by this format call.
+*                  Can be NULL.
+* @param status    Output param filled with success/failure status.
+* @return          Reference to 'appendTo' parameter.
+* @stable 4.4
+*/
+virtual UnicodeString& format(const StringPiece &number,
+UnicodeString& appendTo,
+FieldPositionIterator* posIter,
+UErrorCode& status) const;
+/**
+* Format a decimal number.
+* The number is a DigitList wrapper onto a floating point decimal number.
+* The default implementation in NumberFormat converts the decimal number
+* to a double and formats that.
+*
+* @param number    The number, a DigitList format Decimal Floating Point.
+* @param appendTo  Output parameter to receive result.
+*                  Result is appended to existing contents.
+* @param posIter   On return, can be used to iterate over positions
+*                  of fields generated by this format call.
+* @param status    Output param filled with success/failure status.
+* @return          Reference to 'appendTo' parameter.
+* @internal
+*/
+virtual UnicodeString& format(const DigitList &number,
+UnicodeString& appendTo,
+FieldPositionIterator* posIter,
+UErrorCode& status) const;
+/**
+* Format a decimal number.
+* The number is a DigitList wrapper onto a floating point decimal number.
+* The default implementation in NumberFormat converts the decimal number
+* to a double and formats that.
+*
+* @param number    The number, a DigitList format Decimal Floating Point.
+* @param appendTo  Output parameter to receive result.
+*                  Result is appended to existing contents.
+* @param pos       On input: an alignment field, if desired.
+*                  On output: the offsets of the alignment field.
+* @param status    Output param filled with success/failure status.
+* @return          Reference to 'appendTo' parameter.
+* @internal
+*/
+virtual UnicodeString& format(const DigitList &number,
+UnicodeString& appendTo,
+FieldPosition& pos,
+UErrorCode& status) const;
+using NumberFormat::parse;
+/**
+* Parse the given string using this object's choices. The method
+* does string comparisons to try to find an optimal match.
+* If no object can be parsed, index is unchanged, and NULL is
+* returned.  The result is returned as the most parsimonious
+* type of Formattable that will accomodate all of the
+* necessary precision.  For example, if the result is exactly 12,
+* it will be returned as a long.  However, if it is 1.5, it will
+* be returned as a double.
+*
+* @param text           The text to be parsed.
+* @param result         Formattable to be set to the parse result.
+*                       If parse fails, return contents are undefined.
+* @param parsePosition  The position to start parsing at on input.
+*                       On output, moved to after the last successfully
+*                       parse character. On parse failure, does not change.
+* @see Formattable
+* @stable ICU 2.0
+*/
+virtual void parse(const UnicodeString& text,
+Formattable& result,
+ParsePosition& parsePosition) const;
+/**
+* Parses text from the given string as a currency amount.  Unlike
+* the parse() method, this method will attempt to parse a generic
+* currency name, searching for a match of this object's locale's
+* currency display names, or for a 3-letter ISO currency code.
+* This method will fail if this format is not a currency format,
+* that is, if it does not contain the currency pattern symbol
+* (U+00A4) in its prefix or suffix.
+*
+* @param text the string to parse
+* @param pos  input-output position; on input, the position within text
+*             to match; must have 0 <= pos.getIndex() < text.length();
+*             on output, the position after the last matched character.
+*             If the parse fails, the position in unchanged upon output.
+* @return     if parse succeeds, a pointer to a newly-created CurrencyAmount
+*             object (owned by the caller) containing information about
+*             the parsed currency; if parse fails, this is NULL.
+* @stable ICU 49
+*/
+virtual CurrencyAmount* parseCurrency(const UnicodeString& text,
+ParsePosition& pos) const;
+/**
+* Returns the decimal format symbols, which is generally not changed
+* by the programmer or user.
+* @return desired DecimalFormatSymbols
+* @see DecimalFormatSymbols
+* @stable ICU 2.0
+*/
+virtual const DecimalFormatSymbols* getDecimalFormatSymbols(void) const;
+/**
+* Sets the decimal format symbols, which is generally not changed
+* by the programmer or user.
+* @param symbolsToAdopt DecimalFormatSymbols to be adopted.
+* @stable ICU 2.0
+*/
+virtual void adoptDecimalFormatSymbols(DecimalFormatSymbols* symbolsToAdopt);
+/**
+* Sets the decimal format symbols, which is generally not changed
+* by the programmer or user.
+* @param symbols DecimalFormatSymbols.
+* @stable ICU 2.0
+*/
+virtual void setDecimalFormatSymbols(const DecimalFormatSymbols& symbols);
+/**
+* Returns the currency plural format information,
+* which is generally not changed by the programmer or user.
+* @return desired CurrencyPluralInfo
+* @stable ICU 4.2
+*/
+virtual const CurrencyPluralInfo* getCurrencyPluralInfo(void) const;
+/**
+* Sets the currency plural format information,
+* which is generally not changed by the programmer or user.
+* @param toAdopt CurrencyPluralInfo to be adopted.
+* @stable ICU 4.2
+*/
+virtual void adoptCurrencyPluralInfo(CurrencyPluralInfo* toAdopt);
+/**
+* Sets the currency plural format information,
+* which is generally not changed by the programmer or user.
+* @param info Currency Plural Info.
+* @stable ICU 4.2
+*/
+virtual void setCurrencyPluralInfo(const CurrencyPluralInfo& info);
+/**
+* Get the positive prefix.
+*
+* @param result    Output param which will receive the positive prefix.
+* @return          A reference to 'result'.
+* Examples: +123, $123, sFr123
+* @stable ICU 2.0
+*/
+UnicodeString& getPositivePrefix(UnicodeString& result) const;
+/**
+* Set the positive prefix.
+*
+* @param newValue    the new value of the the positive prefix to be set.
+* Examples: +123, $123, sFr123
+* @stable ICU 2.0
+*/
+virtual void setPositivePrefix(const UnicodeString& newValue);
+/**
+* Get the negative prefix.
+*
+* @param result    Output param which will receive the negative prefix.
+* @return          A reference to 'result'.
+* Examples: -123, ($123) (with negative suffix), sFr-123
+* @stable ICU 2.0
+*/
+UnicodeString& getNegativePrefix(UnicodeString& result) const;
+/**
+* Set the negative prefix.
+*
+* @param newValue    the new value of the the negative prefix to be set.
+* Examples: -123, ($123) (with negative suffix), sFr-123
+* @stable ICU 2.0
+*/
+virtual void setNegativePrefix(const UnicodeString& newValue);
+/**
+* Get the positive suffix.
+*
+* @param result    Output param which will receive the positive suffix.
+* @return          A reference to 'result'.
+* Example: 123%
+* @stable ICU 2.0
+*/
+UnicodeString& getPositiveSuffix(UnicodeString& result) const;
+/**
+* Set the positive suffix.
+*
+* @param newValue    the new value of the positive suffix to be set.
+* Example: 123%
+* @stable ICU 2.0
+*/
+virtual void setPositiveSuffix(const UnicodeString& newValue);
+/**
+* Get the negative suffix.
+*
+* @param result    Output param which will receive the negative suffix.
+* @return          A reference to 'result'.
+* Examples: -123%, ($123) (with positive suffixes)
+* @stable ICU 2.0
+*/
+UnicodeString& getNegativeSuffix(UnicodeString& result) const;
+/**
+* Set the negative suffix.
+*
+* @param newValue    the new value of the negative suffix to be set.
+* Examples: 123%
+* @stable ICU 2.0
+*/
+virtual void setNegativeSuffix(const UnicodeString& newValue);
+/**
+* Get the multiplier for use in percent, permill, etc.
+* For a percentage, set the suffixes to have "%" and the multiplier to be 100.
+* (For Arabic, use arabic percent symbol).
+* For a permill, set the suffixes to have "\\u2031" and the multiplier to be 1000.
+*
+* @return    the multiplier for use in percent, permill, etc.
+* Examples: with 100, 1.23 -> "123", and "123" -> 1.23
+* @stable ICU 2.0
+*/
+int32_t getMultiplier(void) const;
+/**
+* Set the multiplier for use in percent, permill, etc.
+* For a percentage, set the suffixes to have "%" and the multiplier to be 100.
+* (For Arabic, use arabic percent symbol).
+* For a permill, set the suffixes to have "\\u2031" and the multiplier to be 1000.
+*
+* @param newValue    the new value of the multiplier for use in percent, permill, etc.
+* Examples: with 100, 1.23 -> "123", and "123" -> 1.23
+* @stable ICU 2.0
+*/
+virtual void setMultiplier(int32_t newValue);
+/**
+* Get the rounding increment.
+* @return A positive rounding increment, or 0.0 if a custom rounding
+* increment is not in effect.
+* @see #setRoundingIncrement
+* @see #getRoundingMode
+* @see #setRoundingMode
+* @stable ICU 2.0
+*/
+virtual double getRoundingIncrement(void) const;
+/**
+* Set the rounding increment.  In the absence of a rounding increment,
+*    numbers will be rounded to the number of digits displayed.
+* @param newValue A positive rounding increment, or 0.0 to
+* use the default rounding increment.
+* Negative increments are equivalent to 0.0.
+* @see #getRoundingIncrement
+* @see #getRoundingMode
+* @see #setRoundingMode
+* @stable ICU 2.0
+*/
+virtual void setRoundingIncrement(double newValue);
+/**
+* Get the rounding mode.
+* @return A rounding mode
+* @see #setRoundingIncrement
+* @see #getRoundingIncrement
+* @see #setRoundingMode
+* @stable ICU 2.0
+*/
+virtual ERoundingMode getRoundingMode(void) const;
+/**
+* Set the rounding mode.
+* @param roundingMode A rounding mode
+* @see #setRoundingIncrement
+* @see #getRoundingIncrement
+* @see #getRoundingMode
+* @stable ICU 2.0
+*/
+virtual void setRoundingMode(ERoundingMode roundingMode);
+/**
+* Get the width to which the output of format() is padded.
+* The width is counted in 16-bit code units.
+* @return the format width, or zero if no padding is in effect
+* @see #setFormatWidth
+* @see #getPadCharacterString
+* @see #setPadCharacter
+* @see #getPadPosition
+* @see #setPadPosition
+* @stable ICU 2.0
+*/
+virtual int32_t getFormatWidth(void) const;
+/**
+* Set the width to which the output of format() is padded.
+* The width is counted in 16-bit code units.
+* This method also controls whether padding is enabled.
+* @param width the width to which to pad the result of
+* format(), or zero to disable padding.  A negative
+* width is equivalent to 0.
+* @see #getFormatWidth
+* @see #getPadCharacterString
+* @see #setPadCharacter
+* @see #getPadPosition
+* @see #setPadPosition
+* @stable ICU 2.0
+*/
+virtual void setFormatWidth(int32_t width);
+/**
+* Get the pad character used to pad to the format width.  The
+* default is ' '.
+* @return a string containing the pad character. This will always
+* have a length of one 32-bit code point.
+* @see #setFormatWidth
+* @see #getFormatWidth
+* @see #setPadCharacter
+* @see #getPadPosition
+* @see #setPadPosition
+* @stable ICU 2.0
+*/
+virtual UnicodeString getPadCharacterString() const;
+/**
+* Set the character used to pad to the format width.  If padding
+* is not enabled, then this will take effect if padding is later
+* enabled.
+* @param padChar a string containing the pad charcter. If the string
+* has length 0, then the pad characer is set to ' '.  Otherwise
+* padChar.char32At(0) will be used as the pad character.
+* @see #setFormatWidth
+* @see #getFormatWidth
+* @see #getPadCharacterString
+* @see #getPadPosition
+* @see #setPadPosition
+* @stable ICU 2.0
+*/
+virtual void setPadCharacter(const UnicodeString &padChar);
+/**
+* Get the position at which padding will take place.  This is the location
+* at which padding will be inserted if the result of format()
+* is shorter than the format width.
+* @return the pad position, one of kPadBeforePrefix,
+* kPadAfterPrefix, kPadBeforeSuffix, or
+* kPadAfterSuffix.
+* @see #setFormatWidth
+* @see #getFormatWidth
+* @see #setPadCharacter
+* @see #getPadCharacterString
+* @see #setPadPosition
+* @see #EPadPosition
+* @stable ICU 2.0
+*/
+virtual EPadPosition getPadPosition(void) const;
+/**
+* Set the position at which padding will take place.  This is the location
+* at which padding will be inserted if the result of format()
+* is shorter than the format width.  This has no effect unless padding is
+* enabled.
+* @param padPos the pad position, one of kPadBeforePrefix,
+* kPadAfterPrefix, kPadBeforeSuffix, or
+* kPadAfterSuffix.
+* @see #setFormatWidth
+* @see #getFormatWidth
+* @see #setPadCharacter
+* @see #getPadCharacterString
+* @see #getPadPosition
+* @see #EPadPosition
+* @stable ICU 2.0
+*/
+virtual void setPadPosition(EPadPosition padPos);
+/**
+* Return whether or not scientific notation is used.
+* @return TRUE if this object formats and parses scientific notation
+* @see #setScientificNotation
+* @see #getMinimumExponentDigits
+* @see #setMinimumExponentDigits
+* @see #isExponentSignAlwaysShown
+* @see #setExponentSignAlwaysShown
+* @stable ICU 2.0
+*/
+virtual UBool isScientificNotation(void) const;
+/**
+* Set whether or not scientific notation is used. When scientific notation
+* is used, the effective maximum number of integer digits is <= 8.  If the
+* maximum number of integer digits is set to more than 8, the effective
+* maximum will be 1.  This allows this call to generate a 'default' scientific
+* number format without additional changes.
+* @param useScientific TRUE if this object formats and parses scientific
+* notation
+* @see #isScientificNotation
+* @see #getMinimumExponentDigits
+* @see #setMinimumExponentDigits
+* @see #isExponentSignAlwaysShown
+* @see #setExponentSignAlwaysShown
+* @stable ICU 2.0
+*/
+virtual void setScientificNotation(UBool useScientific);
+/**
+* Return the minimum exponent digits that will be shown.
+* @return the minimum exponent digits that will be shown
+* @see #setScientificNotation
+* @see #isScientificNotation
+* @see #setMinimumExponentDigits
+* @see #isExponentSignAlwaysShown
+* @see #setExponentSignAlwaysShown
+* @stable ICU 2.0
+*/
+virtual int8_t getMinimumExponentDigits(void) const;
+/**
+* Set the minimum exponent digits that will be shown.  This has no
+* effect unless scientific notation is in use.
+* @param minExpDig a value >= 1 indicating the fewest exponent digits
+* that will be shown.  Values less than 1 will be treated as 1.
+* @see #setScientificNotation
+* @see #isScientificNotation
+* @see #getMinimumExponentDigits
+* @see #isExponentSignAlwaysShown
+* @see #setExponentSignAlwaysShown
+* @stable ICU 2.0
+*/
+virtual void setMinimumExponentDigits(int8_t minExpDig);
+/**
+* Return whether the exponent sign is always shown.
+* @return TRUE if the exponent is always prefixed with either the
+* localized minus sign or the localized plus sign, false if only negative
+* exponents are prefixed with the localized minus sign.
+* @see #setScientificNotation
+* @see #isScientificNotation
+* @see #setMinimumExponentDigits
+* @see #getMinimumExponentDigits
+* @see #setExponentSignAlwaysShown
+* @stable ICU 2.0
+*/
+virtual UBool isExponentSignAlwaysShown(void) const;
+/**
+* Set whether the exponent sign is always shown.  This has no effect
+* unless scientific notation is in use.
+* @param expSignAlways TRUE if the exponent is always prefixed with either
+* the localized minus sign or the localized plus sign, false if only
+* negative exponents are prefixed with the localized minus sign.
+* @see #setScientificNotation
+* @see #isScientificNotation
+* @see #setMinimumExponentDigits
+* @see #getMinimumExponentDigits
+* @see #isExponentSignAlwaysShown
+* @stable ICU 2.0
+*/
+virtual void setExponentSignAlwaysShown(UBool expSignAlways);
+/**
+* Return the grouping size. Grouping size is the number of digits between
+* grouping separators in the integer portion of a number.  For example,
+* in the number "123,456.78", the grouping size is 3.
+*
+* @return    the grouping size.
+* @see setGroupingSize
+* @see NumberFormat::isGroupingUsed
+* @see DecimalFormatSymbols::getGroupingSeparator
+* @stable ICU 2.0
+*/
+int32_t getGroupingSize(void) const;
+/**
+* Set the grouping size. Grouping size is the number of digits between
+* grouping separators in the integer portion of a number.  For example,
+* in the number "123,456.78", the grouping size is 3.
+*
+* @param newValue    the new value of the grouping size.
+* @see getGroupingSize
+* @see NumberFormat::setGroupingUsed
+* @see DecimalFormatSymbols::setGroupingSeparator
+* @stable ICU 2.0
+*/
+virtual void setGroupingSize(int32_t newValue);
+/**
+* Return the secondary grouping size. In some locales one
+* grouping interval is used for the least significant integer
+* digits (the primary grouping size), and another is used for all
+* others (the secondary grouping size).  A formatter supporting a
+* secondary grouping size will return a positive integer unequal
+* to the primary grouping size returned by
+* getGroupingSize().  For example, if the primary
+* grouping size is 4, and the secondary grouping size is 2, then
+* the number 123456789 formats as "1,23,45,6789", and the pattern
+* appears as "#,##,###0".
+* @return the secondary grouping size, or a value less than
+* one if there is none
+* @see setSecondaryGroupingSize
+* @see NumberFormat::isGroupingUsed
+* @see DecimalFormatSymbols::getGroupingSeparator
+* @stable ICU 2.4
+*/
+int32_t getSecondaryGroupingSize(void) const;
+/**
+* Set the secondary grouping size. If set to a value less than 1,
+* then secondary grouping is turned off, and the primary grouping
+* size is used for all intervals, not just the least significant.
+*
+* @param newValue    the new value of the secondary grouping size.
+* @see getSecondaryGroupingSize
+* @see NumberFormat#setGroupingUsed
+* @see DecimalFormatSymbols::setGroupingSeparator
+* @stable ICU 2.4
+*/
+virtual void setSecondaryGroupingSize(int32_t newValue);
+/**
+* Allows you to get the behavior of the decimal separator with integers.
+* (The decimal separator will always appear with decimals.)
+*
+* @return    TRUE if the decimal separator always appear with decimals.
+* Example: Decimal ON: 12345 -> 12345.; OFF: 12345 -> 12345
+* @stable ICU 2.0
+*/
+UBool isDecimalSeparatorAlwaysShown(void) const;
+/**
+* Allows you to set the behavior of the decimal separator with integers.
+* (The decimal separator will always appear with decimals.)
+*
+* @param newValue    set TRUE if the decimal separator will always appear with decimals.
+* Example: Decimal ON: 12345 -> 12345.; OFF: 12345 -> 12345
+* @stable ICU 2.0
+*/
+virtual void setDecimalSeparatorAlwaysShown(UBool newValue);
+/**
+* Synthesizes a pattern string that represents the current state
+* of this Format object.
+*
+* @param result    Output param which will receive the pattern.
+*                  Previous contents are deleted.
+* @return          A reference to 'result'.
+* @see applyPattern
+* @stable ICU 2.0
+*/
+virtual UnicodeString& toPattern(UnicodeString& result) const;
+/**
+* Synthesizes a localized pattern string that represents the current
+* state of this Format object.
+*
+* @param result    Output param which will receive the localized pattern.
+*                  Previous contents are deleted.
+* @return          A reference to 'result'.
+* @see applyPattern
+* @stable ICU 2.0
+*/
+virtual UnicodeString& toLocalizedPattern(UnicodeString& result) const;
+/**
+* Apply the given pattern to this Format object.  A pattern is a
+* short-hand specification for the various formatting properties.
+* These properties can also be changed individually through the
+* various setter methods.
+* <P>
+* There is no limit to integer digits are set
+* by this routine, since that is the typical end-user desire;
+* use setMaximumInteger if you want to set a real value.
+* For negative numbers, use a second pattern, separated by a semicolon
+* <pre>
+* .      Example "#,#00.0#" -> 1,234.56
+* </pre>
+* This means a minimum of 2 integer digits, 1 fraction digit, and
+* a maximum of 2 fraction digits.
+* <pre>
+* .      Example: "#,#00.0#;(#,#00.0#)" for negatives in parantheses.
+* </pre>
+* In negative patterns, the minimum and maximum counts are ignored;
+* these are presumed to be set in the positive pattern.
+*
+* @param pattern    The pattern to be applied.
+* @param parseError Struct to recieve information on position
+*                   of error if an error is encountered
+* @param status     Output param set to success/failure code on
+*                   exit. If the pattern is invalid, this will be
+*                   set to a failure result.
+* @stable ICU 2.0
+*/
+virtual void applyPattern(const UnicodeString& pattern,
+UParseError& parseError,
+UErrorCode& status);
+/**
+* Sets the pattern.
+* @param pattern   The pattern to be applied.
+* @param status    Output param set to success/failure code on
+*                  exit. If the pattern is invalid, this will be
+*                  set to a failure result.
+* @stable ICU 2.0
+*/
+virtual void applyPattern(const UnicodeString& pattern,
+UErrorCode& status);
+/**
+* Apply the given pattern to this Format object.  The pattern
+* is assumed to be in a localized notation. A pattern is a
+* short-hand specification for the various formatting properties.
+* These properties can also be changed individually through the
+* various setter methods.
+* <P>
+* There is no limit to integer digits are set
+* by this routine, since that is the typical end-user desire;
+* use setMaximumInteger if you want to set a real value.
+* For negative numbers, use a second pattern, separated by a semicolon
+* <pre>
+* .      Example "#,#00.0#" -> 1,234.56
+* </pre>
+* This means a minimum of 2 integer digits, 1 fraction digit, and
+* a maximum of 2 fraction digits.
+*
+* Example: "#,#00.0#;(#,#00.0#)" for negatives in parantheses.
+*
+* In negative patterns, the minimum and maximum counts are ignored;
+* these are presumed to be set in the positive pattern.
+*
+* @param pattern   The localized pattern to be applied.
+* @param parseError Struct to recieve information on position
+*                   of error if an error is encountered
+* @param status    Output param set to success/failure code on
+*                  exit. If the pattern is invalid, this will be
+*                  set to a failure result.
+* @stable ICU 2.0
+*/
+virtual void applyLocalizedPattern(const UnicodeString& pattern,
+UParseError& parseError,
+UErrorCode& status);
+/**
+* Apply the given pattern to this Format object.
+*
+* @param pattern   The localized pattern to be applied.
+* @param status    Output param set to success/failure code on
+*                  exit. If the pattern is invalid, this will be
+*                  set to a failure result.
+* @stable ICU 2.0
+*/
+virtual void applyLocalizedPattern(const UnicodeString& pattern,
+UErrorCode& status);
+/**
+* Sets the maximum number of digits allowed in the integer portion of a
+* number. This override limits the integer digit count to 309.
+*
+* @param newValue    the new value of the maximum number of digits
+*                      allowed in the integer portion of a number.
+* @see NumberFormat#setMaximumIntegerDigits
+* @stable ICU 2.0
+*/
+virtual void setMaximumIntegerDigits(int32_t newValue);
+/**
+* Sets the minimum number of digits allowed in the integer portion of a
+* number. This override limits the integer digit count to 309.
+*
+* @param newValue    the new value of the minimum number of digits
+*                      allowed in the integer portion of a number.
+* @see NumberFormat#setMinimumIntegerDigits
+* @stable ICU 2.0
+*/
+virtual void setMinimumIntegerDigits(int32_t newValue);
+/**
+* Sets the maximum number of digits allowed in the fraction portion of a
+* number. This override limits the fraction digit count to 340.
+*
+* @param newValue    the new value of the maximum number of digits
+*                    allowed in the fraction portion of a number.
+* @see NumberFormat#setMaximumFractionDigits
+* @stable ICU 2.0
+*/
+virtual void setMaximumFractionDigits(int32_t newValue);
+/**
+* Sets the minimum number of digits allowed in the fraction portion of a
+* number. This override limits the fraction digit count to 340.
+*
+* @param newValue    the new value of the minimum number of digits
+*                    allowed in the fraction portion of a number.
+* @see NumberFormat#setMinimumFractionDigits
+* @stable ICU 2.0
+*/
+virtual void setMinimumFractionDigits(int32_t newValue);
+/**
+* Returns the minimum number of significant digits that will be
+* displayed. This value has no effect unless areSignificantDigitsUsed()
+* returns true.
+* @return the fewest significant digits that will be shown
+* @stable ICU 3.0
+*/
+int32_t getMinimumSignificantDigits() const;
+/**
+* Returns the maximum number of significant digits that will be
+* displayed. This value has no effect unless areSignificantDigitsUsed()
+* returns true.
+* @return the most significant digits that will be shown
+* @stable ICU 3.0
+*/
+int32_t getMaximumSignificantDigits() const;
+/**
+* Sets the minimum number of significant digits that will be
+* displayed.  If <code>min</code> is less than one then it is set
+* to one.  If the maximum significant digits count is less than
+* <code>min</code>, then it is set to <code>min</code>.
+* This function also enables the use of significant digits
+* by this formatter - areSignificantDigitsUsed() will return TRUE.
+* @see #areSignificantDigitsUsed
+* @param min the fewest significant digits to be shown
+* @stable ICU 3.0
+*/
+void setMinimumSignificantDigits(int32_t min);
+/**
+* Sets the maximum number of significant digits that will be
+* displayed.  If <code>max</code> is less than one then it is set
+* to one.  If the minimum significant digits count is greater
+* than <code>max</code>, then it is set to <code>max</code>.
+* This function also enables the use of significant digits
+* by this formatter - areSignificantDigitsUsed() will return TRUE.
+* @see #areSignificantDigitsUsed
+* @param max the most significant digits to be shown
+* @stable ICU 3.0
+*/
+void setMaximumSignificantDigits(int32_t max);
+/**
+* Returns true if significant digits are in use, or false if
+* integer and fraction digit counts are in use.
+* @return true if significant digits are in use
+* @stable ICU 3.0
+*/
+UBool areSignificantDigitsUsed() const;
+/**
+* Sets whether significant digits are in use, or integer and
+* fraction digit counts are in use.
+* @param useSignificantDigits true to use significant digits, or
+* false to use integer and fraction digit counts
+* @stable ICU 3.0
+*/
+void setSignificantDigitsUsed(UBool useSignificantDigits);
+public:
+/**
+* Sets the currency used to display currency
+* amounts.  This takes effect immediately, if this format is a
+* currency format.  If this format is not a currency format, then
+* the currency is used if and when this object becomes a
+* currency format through the application of a new pattern.
+* @param theCurrency a 3-letter ISO code indicating new currency
+* to use.  It need not be null-terminated.  May be the empty
+* string or NULL to indicate no currency.
+* @param ec input-output error code
+* @stable ICU 3.0
+*/
+virtual void setCurrency(const UChar* theCurrency, UErrorCode& ec);
+/**
+* Sets the currency used to display currency amounts.  See
+* setCurrency(const UChar*, UErrorCode&).
+* @deprecated ICU 3.0. Use setCurrency(const UChar*, UErrorCode&).
+*/
+virtual void setCurrency(const UChar* theCurrency);
+/**
+* The resource tags we use to retrieve decimal format data from
+* locale resource bundles.
+* @deprecated ICU 3.4. This string has no public purpose. Please don't use it.
+*/
+static const char fgNumberPatterns[];
+#ifndef U_HIDE_INTERNAL_API
+/**
+*  Get a FixedDecimal corresponding to a double as it would be
+*  formatted by this DecimalFormat.
+*  Internal, not intended for public use.
+*  @internal
+*/
+FixedDecimal getFixedDecimal(double number, UErrorCode &status) const;
+/**
+*  Get a FixedDecimal corresponding to a formattable as it would be
+*  formatted by this DecimalFormat.
+*  Internal, not intended for public use.
+*  @internal
+*/
+FixedDecimal getFixedDecimal(const Formattable &number, UErrorCode &status) const;
+/**
+*  Get a FixedDecimal corresponding to a DigitList as it would be
+*  formatted by this DecimalFormat. Note: the DigitList may be modified.
+*  Internal, not intended for public use.
+*  @internal
+*/
+FixedDecimal getFixedDecimal(DigitList &number, UErrorCode &status) const;
+#endif  /* U_HIDE_INTERNAL_API */
+public:
+/**
+* Return the class ID for this class.  This is useful only for
+* comparing to a return value from getDynamicClassID().  For example:
+* <pre>
+* .      Base* polymorphic_pointer = createPolymorphicObject();
+* .      if (polymorphic_pointer->getDynamicClassID() ==
+* .          Derived::getStaticClassID()) ...
+* </pre>
+* @return          The class ID for all objects of this class.
+* @stable ICU 2.0
+*/
+static UClassID U_EXPORT2 getStaticClassID(void);
+/**
+* Returns a unique class ID POLYMORPHICALLY.  Pure virtual override.
+* This method is to implement a simple version of RTTI, since not all
+* C++ compilers support genuine RTTI.  Polymorphic operator==() and
+* clone() methods call this method.
+*
+* @return          The class ID for this object. All objects of a
+*                  given class have the same class ID.  Objects of
+*                  other classes have different class IDs.
+* @stable ICU 2.0
+*/
+virtual UClassID getDynamicClassID(void) const;
+private:
+DecimalFormat(); // default constructor not implemented
+int32_t precision() const;
+/**
+*   Initialize all fields of a new DecimalFormatter to a safe default value.
+*      Common code for use by constructors.
+*/
+void init();
+/**
+* Do real work of constructing a new DecimalFormat.
+*/
+void construct(UErrorCode&              status,
+UParseError&             parseErr,
+const UnicodeString*     pattern = 0,
+DecimalFormatSymbols*    symbolsToAdopt = 0
+);
+/**
+* Does the real work of generating a pattern.
+*
+* @param result     Output param which will receive the pattern.
+*                   Previous contents are deleted.
+* @param localized  TRUE return localized pattern.
+* @return           A reference to 'result'.
+*/
+UnicodeString& toPattern(UnicodeString& result, UBool localized) const;
+/**
+* Does the real work of applying a pattern.
+* @param pattern    The pattern to be applied.
+* @param localized  If true, the pattern is localized; else false.
+* @param parseError Struct to recieve information on position
+*                   of error if an error is encountered
+* @param status     Output param set to success/failure code on
+*                   exit. If the pattern is invalid, this will be
+*                   set to a failure result.
+*/
+void applyPattern(const UnicodeString& pattern,
+UBool localized,
+UParseError& parseError,
+UErrorCode& status);
+/*
+* similar to applyPattern, but without re-gen affix for currency
+*/
+void applyPatternInternally(const UnicodeString& pluralCount,
+const UnicodeString& pattern,
+UBool localized,
+UParseError& parseError,
+UErrorCode& status);
+/*
+* only apply pattern without expand affixes
+*/
+void applyPatternWithoutExpandAffix(const UnicodeString& pattern,
+UBool localized,
+UParseError& parseError,
+UErrorCode& status);
+/*
+* expand affixes (after apply patter) and re-compute fFormatWidth
+*/
+void expandAffixAdjustWidth(const UnicodeString* pluralCount);
+/**
+* Do the work of formatting a number, either a double or a long.
+*
+* @param appendTo       Output parameter to receive result.
+*                       Result is appended to existing contents.
+* @param handler        Records information about field positions.
+* @param digits         the digits to be formatted.
+* @param isInteger      if TRUE format the digits as Integer.
+* @return               Reference to 'appendTo' parameter.
+*/
+UnicodeString& subformat(UnicodeString& appendTo,
+FieldPositionHandler& handler,
+DigitList&     digits,
+UBool          isInteger,
+UErrorCode &status) const;
+void parse(const UnicodeString& text,
+Formattable& result,
+ParsePosition& pos,
+UChar* currency) const;
+enum {
+fgStatusInfinite,
+fgStatusLength      // Leave last in list.
+} StatusFlags;
+UBool subparse(const UnicodeString& text,
+const UnicodeString* negPrefix,
+const UnicodeString* negSuffix,
+const UnicodeString* posPrefix,
+const UnicodeString* posSuffix,
+UBool complexCurrencyParsing,
+int8_t type,
+ParsePosition& parsePosition,
+DigitList& digits, UBool* status,
+UChar* currency) const;
+// Mixed style parsing for currency.
+// It parses against the current currency pattern
+// using complex affix comparison
+// parses against the currency plural patterns using complex affix comparison,
+// and parses against the current pattern using simple affix comparison.
+UBool parseForCurrency(const UnicodeString& text,
+ParsePosition& parsePosition,
+DigitList& digits,
+UBool* status,
+UChar* currency) const;
+int32_t skipPadding(const UnicodeString& text, int32_t position) const;
+int32_t compareAffix(const UnicodeString& input,
+int32_t pos,
+UBool isNegative,
+UBool isPrefix,
+const UnicodeString* affixPat,
+UBool complexCurrencyParsing,
+int8_t type,
+UChar* currency) const;
+static UnicodeString& trimMarksFromAffix(const UnicodeString& affix, UnicodeString& trimmedAffix);
+UBool equalWithSignCompatibility(UChar32 lhs, UChar32 rhs) const;
+int32_t compareSimpleAffix(const UnicodeString& affix,
+const UnicodeString& input,
+int32_t pos,
+UBool lenient) const;
+static int32_t skipPatternWhiteSpace(const UnicodeString& text, int32_t pos);
+static int32_t skipUWhiteSpace(const UnicodeString& text, int32_t pos);
+static int32_t skipUWhiteSpaceAndMarks(const UnicodeString& text, int32_t pos);
+static int32_t skipBidiMarks(const UnicodeString& text, int32_t pos);
+int32_t compareComplexAffix(const UnicodeString& affixPat,
+const UnicodeString& input,
+int32_t pos,
+int8_t type,
+UChar* currency) const;
+static int32_t match(const UnicodeString& text, int32_t pos, UChar32 ch);
+static int32_t match(const UnicodeString& text, int32_t pos, const UnicodeString& str);
+static UBool matchSymbol(const UnicodeString &text, int32_t position, int32_t length, const UnicodeString &symbol,
+UnicodeSet *sset, UChar32 schar);
+static UBool matchDecimal(UChar32 symbolChar,
+UBool sawDecimal,  UChar32 sawDecimalChar,
+const UnicodeSet *sset, UChar32 schar);
+static UBool matchGrouping(UChar32 groupingChar,
+UBool sawGrouping, UChar32 sawGroupingChar,
+const UnicodeSet *sset,
+UChar32 decimalChar, const UnicodeSet *decimalSet,
+UChar32 schar);
+/**
+* Get a decimal format symbol.
+* Returns a const reference to the symbol string.
+* @internal
+*/
+inline const UnicodeString &getConstSymbol(DecimalFormatSymbols::ENumberFormatSymbol symbol) const;
+int32_t appendAffix(UnicodeString& buf,
+double number,
+FieldPositionHandler& handler,
+UBool isNegative,
+UBool isPrefix) const;
+/**
+* Append an affix to the given UnicodeString, using quotes if
+* there are special characters.  Single quotes themselves must be
+* escaped in either case.
+*/
+void appendAffixPattern(UnicodeString& appendTo, const UnicodeString& affix,
+UBool localized) const;
+void appendAffixPattern(UnicodeString& appendTo,
+const UnicodeString* affixPattern,
+const UnicodeString& expAffix, UBool localized) const;
+void expandAffix(const UnicodeString& pattern,
+UnicodeString& affix,
+double number,
+FieldPositionHandler& handler,
+UBool doFormat,
+const UnicodeString* pluralCount) const;
+void expandAffixes(const UnicodeString* pluralCount);
+void addPadding(UnicodeString& appendTo,
+FieldPositionHandler& handler,
+int32_t prefixLen, int32_t suffixLen) const;
+UBool isGroupingPosition(int32_t pos) const;
+void setCurrencyForSymbols();
+// similar to setCurrency without re-compute the affixes for currency.
+// If currency changes, the affix pattern for currency is not changed,
+// but the affix will be changed. So, affixes need to be
+// re-computed in setCurrency(), but not in setCurrencyInternally().
+virtual void setCurrencyInternally(const UChar* theCurrency, UErrorCode& ec);
+// set up currency affix patterns for mix parsing.
+// The patterns saved here are the affix patterns of default currency
+// pattern and the unique affix patterns of the plural currency patterns.
+// Those patterns are used by parseForCurrency().
+void setupCurrencyAffixPatterns(UErrorCode& status);
+// set up the currency affixes used in currency plural formatting.
+// It sets up both fAffixesForCurrency for currency pattern if the current
+// pattern contains 3 currency signs,
+// and it sets up fPluralAffixesForCurrency for currency plural patterns.
+void setupCurrencyAffixes(const UnicodeString& pattern,
+UBool setupForCurrentPattern,
+UBool setupForPluralPattern,
+UErrorCode& status);
+// hashtable operations
+Hashtable* initHashForAffixPattern(UErrorCode& status);
+Hashtable* initHashForAffix(UErrorCode& status);
+void deleteHashForAffixPattern();
+void deleteHashForAffix(Hashtable*& table);
+void copyHashForAffixPattern(const Hashtable* source,
+Hashtable* target, UErrorCode& status);
+void copyHashForAffix(const Hashtable* source,
+Hashtable* target, UErrorCode& status);
+UnicodeString& _format(int64_t number,
+UnicodeString& appendTo,
+FieldPositionHandler& handler,
+UErrorCode &status) const;
+UnicodeString& _format(double number,
+UnicodeString& appendTo,
+FieldPositionHandler& handler,
+UErrorCode &status) const;
+UnicodeString& _format(const DigitList &number,
+UnicodeString& appendTo,
+FieldPositionHandler& handler,
+UErrorCode &status) const;
+// currency sign count
+enum {
+fgCurrencySignCountZero,
+fgCurrencySignCountInSymbolFormat,
+fgCurrencySignCountInISOFormat,
+fgCurrencySignCountInPluralFormat
+} CurrencySignCount;
+/**
+* Constants.
+*/
+UnicodeString           fPositivePrefix;
+UnicodeString           fPositiveSuffix;
+UnicodeString           fNegativePrefix;
+UnicodeString           fNegativeSuffix;
+UnicodeString*          fPosPrefixPattern;
+UnicodeString*          fPosSuffixPattern;
+UnicodeString*          fNegPrefixPattern;
+UnicodeString*          fNegSuffixPattern;
+/**
+* Formatter for ChoiceFormat-based currency names.  If this field
+* is not null, then delegate to it to format currency symbols.
+* @since ICU 2.6
+*/
+ChoiceFormat*           fCurrencyChoice;
+DigitList *             fMultiplier;   // NULL for multiplier of one
+int32_t                 fScale;
+int32_t                 fGroupingSize;
+int32_t                 fGroupingSize2;
+UBool                   fDecimalSeparatorAlwaysShown;
+DecimalFormatSymbols*   fSymbols;
+UBool                   fUseSignificantDigits;
+int32_t                 fMinSignificantDigits;
+int32_t                 fMaxSignificantDigits;
+UBool                   fUseExponentialNotation;
+int8_t                  fMinExponentDigits;
+UBool                   fExponentSignAlwaysShown;
+EnumSet<UNumberFormatAttribute,
+UNUM_MAX_NONBOOLEAN_ATTRIBUTE+1,
+UNUM_LIMIT_BOOLEAN_ATTRIBUTE>
+fBoolFlags;
+DigitList*              fRoundingIncrement;  // NULL if no rounding increment specified.
+ERoundingMode           fRoundingMode;
+UChar32                 fPad;
+int32_t                 fFormatWidth;
+EPadPosition            fPadPosition;
+/*
+* Following are used for currency format
+*/
+// pattern used in this formatter
+UnicodeString fFormatPattern;
+// style is only valid when decimal formatter is constructed by
+// DecimalFormat(pattern, decimalFormatSymbol, style)
+int fStyle;
+/*
+* Represents whether this is a currency format, and which
+* currency format style.
+* 0: not currency format type;
+* 1: currency style -- symbol name, such as "$" for US dollar.
+* 2: currency style -- ISO name, such as USD for US dollar.
+* 3: currency style -- plural long name, such as "US Dollar" for
+*                      "1.00 US Dollar", or "US Dollars" for
+*                      "3.00 US Dollars".
+*/
+int fCurrencySignCount;
+/* For currency parsing purose,
+* Need to remember all prefix patterns and suffix patterns of
+* every currency format pattern,
+* including the pattern of default currecny style
+* and plural currency style. And the patterns are set through applyPattern.
+*/
+// TODO: innerclass?
+/* This is not needed in the class declaration, so it is moved into decimfmp.cpp
+struct AffixPatternsForCurrency : public UMemory {
+// negative prefix pattern
+UnicodeString negPrefixPatternForCurrency;
+// negative suffix pattern
+UnicodeString negSuffixPatternForCurrency;
+// positive prefix pattern
+UnicodeString posPrefixPatternForCurrency;
+// positive suffix pattern
+UnicodeString posSuffixPatternForCurrency;
+int8_t patternType;
+AffixPatternsForCurrency(const UnicodeString& negPrefix,
+const UnicodeString& negSuffix,
+const UnicodeString& posPrefix,
+const UnicodeString& posSuffix,
+int8_t type) {
+negPrefixPatternForCurrency = negPrefix;
+negSuffixPatternForCurrency = negSuffix;
+posPrefixPatternForCurrency = posPrefix;
+posSuffixPatternForCurrency = posSuffix;
+patternType = type;
+}
+};
+*/
+/* affix for currency formatting when the currency sign in the pattern
+* equals to 3, such as the pattern contains 3 currency sign or
+* the formatter style is currency plural format style.
+*/
+/* This is not needed in the class declaration, so it is moved into decimfmp.cpp
+struct AffixesForCurrency : public UMemory {
+// negative prefix
+UnicodeString negPrefixForCurrency;
+// negative suffix
+UnicodeString negSuffixForCurrency;
+// positive prefix
+UnicodeString posPrefixForCurrency;
+// positive suffix
+UnicodeString posSuffixForCurrency;
+int32_t formatWidth;
+AffixesForCurrency(const UnicodeString& negPrefix,
+const UnicodeString& negSuffix,
+const UnicodeString& posPrefix,
+const UnicodeString& posSuffix) {
+negPrefixForCurrency = negPrefix;
+negSuffixForCurrency = negSuffix;
+posPrefixForCurrency = posPrefix;
+posSuffixForCurrency = posSuffix;
+}
+};
+*/
+// Affix pattern set for currency.
+// It is a set of AffixPatternsForCurrency,
+// each element of the set saves the negative prefix pattern,
+// negative suffix pattern, positive prefix pattern,
+// and positive suffix  pattern of a pattern.
+// It is used for currency mixed style parsing.
+// It is actually is a set.
+// The set contains the default currency pattern from the locale,
+// and the currency plural patterns.
+// Since it is a set, it does not contain duplicated items.
+// For example, if 2 currency plural patterns are the same, only one pattern
+// is included in the set. When parsing, we do not check whether the plural
+// count match or not.
+Hashtable* fAffixPatternsForCurrency;
+// Following 2 are affixes for currency.
+// It is a hash map from plural count to AffixesForCurrency.
+// AffixesForCurrency saves the negative prefix,
+// negative suffix, positive prefix, and positive suffix of a pattern.
+// It is used during currency formatting only when the currency sign count
+// is 3. In which case, the affixes are getting from here, not
+// from the fNegativePrefix etc.
+Hashtable* fAffixesForCurrency;  // for current pattern
+Hashtable* fPluralAffixesForCurrency;  // for plural pattern
+// Information needed for DecimalFormat to format/parse currency plural.
+CurrencyPluralInfo* fCurrencyPluralInfo;
+#if UCONFIG_HAVE_PARSEALLINPUT
+UNumberFormatAttributeValue fParseAllInput;
+#endif
+// Decimal Format Static Sets singleton.
+const DecimalFormatStaticSets *fStaticSets;
+protected:
+#ifndef U_HIDE_INTERNAL_API
+/**
+* Rounds a value according to the rules of this object.
+* @internal
+*/
+DigitList& _round(const DigitList& number, DigitList& adjustedNum, UBool& isNegative, UErrorCode& status) const;
+#endif  /* U_HIDE_INTERNAL_API */
+/**
+* Returns the currency in effect for this formatter.  Subclasses
+* should override this method as needed.  Unlike getCurrency(),
+* this method should never return "".
+* @result output parameter for null-terminated result, which must
+* have a capacity of at least 4
+* @internal
+*/
+virtual void getEffectiveCurrency(UChar* result, UErrorCode& ec) const;
+/** number of integer digits
+* @stable ICU 2.4
+*/
+static const int32_t  kDoubleIntegerDigits;
+/** number of fraction digits
+* @stable ICU 2.4
+*/
+static const int32_t  kDoubleFractionDigits;
+/**
+* When someone turns on scientific mode, we assume that more than this
+* number of digits is due to flipping from some other mode that didn't
+* restrict the maximum, and so we force 1 integer digit.  We don't bother
+* to track and see if someone is using exponential notation with more than
+* this number, it wouldn't make sense anyway, and this is just to make sure
+* that someone turning on scientific mode with default settings doesn't
+* end up with lots of zeroes.
+* @stable ICU 2.8
+*/
+static const int32_t  kMaxScientificIntegerDigits;
+#if UCONFIG_FORMAT_FASTPATHS_49
+private:
+/**
+* Internal state.
+* @internal
+*/
+uint8_t fReserved[UNUM_DECIMALFORMAT_INTERNAL_SIZE];
+/**
+* Called whenever any state changes. Recomputes whether fastpath is OK to use.
+*/
+void handleChanged();
+#endif
+};
+inline const UnicodeString &
+DecimalFormat::getConstSymbol(DecimalFormatSymbols::ENumberFormatSymbol symbol) const {
+return fSymbols->getConstSymbol(symbol);
+}
+U_NAMESPACE_END
+#endif /* #if !UCONFIG_NO_FORMATTING */
+#endif // _DECIMFMT
+//eof

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intl/icu/source/i18n/unicode/decimfmt.h