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 // Copyright 2010 the V8 project authors. All rights reserved.

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 //

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 #ifndef DOUBLE_CONVERSION_FAST_DTOA_H_

 #define DOUBLE_CONVERSION_FAST_DTOA_H_

 #include "utils.h"

 namespace double_conversion {

 enum FastDtoaMode {

   // Computes the shortest representation of the given input. The returned

   // result will be the most accurate number of this length. Longer

   // representations might be more accurate.

   FAST_DTOA_SHORTEST,

   // Same as FAST_DTOA_SHORTEST but for single-precision floats.

   FAST_DTOA_SHORTEST_SINGLE,

   // Computes a representation where the precision (number of digits) is

   // given as input. The precision is independent of the decimal point.

   FAST_DTOA_PRECISION

 };

 // FastDtoa will produce at most kFastDtoaMaximalLength digits. This does not

 // include the terminating '\0' character.

 static const int kFastDtoaMaximalLength = 17;

 // Same for single-precision numbers.

 static const int kFastDtoaMaximalSingleLength = 9;

 // Provides a decimal representation of v.

 // The result should be interpreted as buffer * 10^(point - length).

 //

 // Precondition:

 //   * v must be a strictly positive finite double.

 //

 // Returns true if it succeeds, otherwise the result can not be trusted.

 // There will be *length digits inside the buffer followed by a null terminator.

 // If the function returns true and mode equals

 //   - FAST_DTOA_SHORTEST, then

 //     the parameter requested_digits is ignored.

 //     The result satisfies

 //         v == (double) (buffer * 10^(point - length)).

 //     The digits in the buffer are the shortest representation possible. E.g.

 //     if 0.099999999999 and 0.1 represent the same double then "1" is returned

 //     with point = 0.

 //     The last digit will be closest to the actual v. That is, even if several

 //     digits might correctly yield 'v' when read again, the buffer will contain

 //     the one closest to v.

 //   - FAST_DTOA_PRECISION, then

 //     the buffer contains requested_digits digits.

 //     the difference v - (buffer * 10^(point-length)) is closest to zero for

 //     all possible representations of requested_digits digits.

 //     If there are two values that are equally close, then FastDtoa returns

 //     false.

 // For both modes the buffer must be large enough to hold the result.

 bool FastDtoa(double d,

               FastDtoaMode mode,

               int requested_digits,

               Vector<char> buffer,

               int* length,

               int* decimal_point);

 }  // namespace double_conversion

 #endif  // DOUBLE_CONVERSION_FAST_DTOA_H_