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// Copyright (C) 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
* Copyright (C) 2003-2013, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: uarrsort.h
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2003aug04
* created by: Markus W. Scherer
*
* Internal function for sorting arrays.
*/
#ifndef __UARRSORT_H__
#define __UARRSORT_H__
#include "unicode/utypes.h"
U_CDECL_BEGIN
/**
* Function type for comparing two items as part of sorting an array or similar.
* Callback function for uprv_sortArray().
*
* @param context Application-specific pointer, passed through by uprv_sortArray().
* @param left Pointer to the "left" item.
* @param right Pointer to the "right" item.
* @return 32-bit signed integer comparison result:
* <0 if left<right
* ==0 if left==right
* >0 if left>right
*
* @internal
*/
typedef int32_t U_CALLCONV
UComparator(const void *context, const void *left, const void *right);
U_CDECL_END
/**
* Array sorting function.
* Uses a UComparator for comparing array items to each other, and simple
* memory copying to move items.
*
* @param array The array to be sorted.
* @param length The number of items in the array.
* @param itemSize The size in bytes of each array item.
* @param cmp UComparator function used to compare two items each.
* @param context Application-specific pointer, passed through to the UComparator.
* @param sortStable If true, a stable sorting algorithm must be used.
* @param pErrorCode ICU in/out UErrorCode parameter.
*
* @internal
*/
U_CAPI void U_EXPORT2
uprv_sortArray(void *array, int32_t length, int32_t itemSize,
UComparator *cmp, const void *context,
UBool sortStable, UErrorCode *pErrorCode);
/**
* Convenience UComparator implementation for uint16_t arrays.
* @internal
*/
U_CAPI int32_t U_EXPORT2
uprv_uint16Comparator(const void *context, const void *left, const void *right);
/**
* Convenience UComparator implementation for int32_t arrays.
* @internal
*/
U_CAPI int32_t U_EXPORT2
uprv_int32Comparator(const void *context, const void *left, const void *right);
/**
* Convenience UComparator implementation for uint32_t arrays.
* @internal
*/
U_CAPI int32_t U_EXPORT2
uprv_uint32Comparator(const void *context, const void *left, const void *right);
/**
* Much like Java Collections.binarySearch(list, key, comparator).
*
* Except: Java documents "If the list contains multiple elements equal to
* the specified object, there is no guarantee which one will be found."
*
* This version here will return the largest index of any equal item,
* for use in stable sorting.
*
* @return the index>=0 where the item was found:
* the largest such index, if multiple, for stable sorting;
* or the index<0 for inserting the item at ~index in sorted order
*/
U_CAPI int32_t U_EXPORT2
uprv_stableBinarySearch(char *array, int32_t length, void *item, int32_t itemSize,
UComparator *cmp, const void *context);
#endif
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