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 /*

 **********************************************************************

 *   Copyright (C) 1999-2010, International Business Machines

 *   Corporation and others.  All Rights Reserved.

 **********************************************************************

 */

 //

 //  UVector64 is a class implementing a vector of 64 bit integers.

 //            It is similar to UVector32, but holds int64_t values rather than int32_t.

 //            Most of the code is unchanged from UVector.

 //

 #ifndef UVECTOR64_H

 #define UVECTOR64_H

 #include "unicode/utypes.h"

 #include "unicode/uobject.h"

 #include "uhash.h"

 #include "uassert.h"

 U_NAMESPACE_BEGIN

 /**

  * <p>Ultralightweight C++ implementation of an <tt>int64_t</tt> vector

  * that has a subset of methods from UVector32

  *

  * <p>This is a very simple implementation, written to satisfy an

  * immediate porting need.  As such, it is not completely fleshed out,

  * and it aims for simplicity and conformity.  Nonetheless, it serves

  * its purpose (porting code from java that uses java.util.Vector)

  * well, and it could be easily made into a more robust vector class.

  *

  * <p><b>Design notes</b>

  *

  * <p>There is index bounds checking, but little is done about it.  If

  * indices are out of bounds, either nothing happens, or zero is

  * returned.  We <em>do</em> avoid indexing off into the weeds.

  *

  * <p>There is detection of out of memory, but the handling is very

  * coarse-grained -- similar to UnicodeString's protocol, but even

  * coarser.  The class contains <em>one static flag</em> that is set

  * when any call to <tt>new</tt> returns zero.  This allows the caller

  * to use several vectors and make just one check at the end to see if

  * a memory failure occurred.  This is more efficient than making a

  * check after each call on each vector when doing many operations on

  * multiple vectors.  The single static flag works best when memory

  * failures are infrequent, and when recovery options are limited or

  * nonexistent.

  *

  * <p><b>To do</b>

  *

  * <p>Improve the handling of index out of bounds errors.

  *

  */

 class U_COMMON_API UVector64 : public UObject {

 private:

     int32_t   count;

     int32_t   capacity;

     int32_t   maxCapacity;   // Limit beyond which capacity is not permitted to grow.

     int64_t*  elements;

 public:

     UVector64(UErrorCode &status);

     UVector64(int32_t initialCapacity, UErrorCode &status);

     virtual ~UVector64();

     /**

      * Assign this object to another (make this a copy of 'other').

      * Use the 'assign' function to assign each element.

      */

     void assign(const UVector64& other, UErrorCode &ec);

     /**

      * Compare this vector with another.  They will be considered

      * equal if they are of the same size and all elements are equal,

      * as compared using this object's comparer.

      */

     UBool operator==(const UVector64& other);

     /**

      * Equivalent to !operator==()

      */

     inline UBool operator!=(const UVector64& other);

     //------------------------------------------------------------

     // subset of java.util.Vector API

     //------------------------------------------------------------

     void addElement(int64_t elem, UErrorCode &status);

     void setElementAt(int64_t elem, int32_t index);

     void insertElementAt(int64_t elem, int32_t index, UErrorCode &status);

     int64_t elementAti(int32_t index) const;

     //UBool equals(const UVector64 &other) const;

     int64_t lastElementi(void) const;

     //int32_t indexOf(int64_t elem, int32_t startIndex = 0) const;

     //UBool contains(int64_t elem) const;

     //UBool containsAll(const UVector64& other) const;

     //UBool removeAll(const UVector64& other);

     //UBool retainAll(const UVector64& other);

     //void removeElementAt(int32_t index);

     void removeAllElements();

     int32_t size(void) const;

     //UBool isEmpty(void) const;

     // Inline.  Use this one for speedy size check.

     inline UBool ensureCapacity(int32_t minimumCapacity, UErrorCode &status);

     // Out-of-line, handles actual growth.  Called by ensureCapacity() when necessary.

     UBool expandCapacity(int32_t minimumCapacity, UErrorCode &status);

     /**

      * Change the size of this vector as follows: If newSize is

      * smaller, then truncate the array, possibly deleting held

      * elements for i >= newSize.  If newSize is larger, grow the

      * array, filling in new slows with zero.

      */

     void setSize(int32_t newSize);

     //------------------------------------------------------------

     // New API

     //------------------------------------------------------------

     //UBool containsNone(const UVector64& other) const;

     //void sortedInsert(int64_t elem, UErrorCode& ec);

     /**

      * Returns a pointer to the internal array holding the vector.

      */

     int64_t *getBuffer() const;

     /**

      * Set the maximum allowed buffer capacity for this vector/stack.

      * Default with no limit set is unlimited, go until malloc() fails.

      * A Limit of zero means unlimited capacity.

      * Units are vector elements (64 bits each), not bytes.

      */

     void setMaxCapacity(int32_t limit);

     /**

      * ICU "poor man's RTTI", returns a UClassID for this class.

      */

     static UClassID U_EXPORT2 getStaticClassID();

     /**

      * ICU "poor man's RTTI", returns a UClassID for the actual class.

      */

     virtual UClassID getDynamicClassID() const;

 private:

     void _init(int32_t initialCapacity, UErrorCode &status);

     // Disallow

     UVector64(const UVector64&);

     // Disallow

     UVector64& operator=(const UVector64&);

     //  API Functions for Stack operations.

     //  In the original UVector, these were in a separate derived class, UStack.

     //  Here in UVector64, they are all together.

 public:

     //UBool empty(void) const;   // TODO:  redundant, same as empty().  Remove it?

     //int64_t peeki(void) const;

     int64_t popi(void);

     int64_t push(int64_t i, UErrorCode &status);

     int64_t *reserveBlock(int32_t size, UErrorCode &status);

     int64_t *popFrame(int32_t size);

 };

 // UVector64 inlines

 inline UBool UVector64::ensureCapacity(int32_t minimumCapacity, UErrorCode &status) {

     if ((minimumCapacity >= 0) && (capacity >= minimumCapacity)) {

         return TRUE;

     } else {

         return expandCapacity(minimumCapacity, status);

     }

 }

 inline int64_t UVector64::elementAti(int32_t index) const {

     return (0 <= index && index < count) ? elements[index] : 0;

 }

 inline void UVector64::addElement(int64_t elem, UErrorCode &status) {

     if (ensureCapacity(count + 1, status)) {

         elements[count] = elem;

         count++;

     }

 }

 inline int64_t *UVector64::reserveBlock(int32_t size, UErrorCode &status) {

     if (ensureCapacity(count+size, status) == FALSE) {

         return NULL;

     }

     int64_t  *rp = elements+count;

     count += size;

     return rp;

 }

 inline int64_t *UVector64::popFrame(int32_t size) {

     U_ASSERT(count >= size);

     count -= size;

     if (count < 0) {

         count = 0;

     }

     return elements+count-size;

 }

 inline int32_t UVector64::size(void) const {

     return count;

 }

 inline int64_t UVector64::lastElementi(void) const {

     return elementAti(count-1);

 }

 inline UBool UVector64::operator!=(const UVector64& other) {

     return !operator==(other);

 }

 inline int64_t *UVector64::getBuffer() const {

     return elements;

 }

 // UStack inlines

 inline int64_t UVector64::push(int64_t i, UErrorCode &status) {

     addElement(i, status);

     return i;

 }

 inline int64_t UVector64::popi(void) {

     int64_t result = 0;

     if (count > 0) {

         count--;

         result = elements[count];

     }

     return result;

 }

 U_NAMESPACE_END

 #endif