92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
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// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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* Copyright (C) 1997-2011, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* file name: uelement.h
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* encoding: UTF-8
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2011jul04
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* created by: Markus W. Scherer
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*
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* Common definitions for UHashTable and UVector.
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* UHashTok moved here from uhash.h and renamed UElement.
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* This allows users of UVector to avoid the confusing #include of uhash.h.
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* uhash.h aliases UElement to UHashTok,
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* so that we need not change all of its code and its users.
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*/
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#ifndef __UELEMENT_H__
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#define __UELEMENT_H__
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#include "unicode/utypes.h"
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U_CDECL_BEGIN
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/**
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* A UVector element, or a key or value within a UHashtable.
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* It may be either a 32-bit integral value or an opaque void* pointer.
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* The void* pointer may be smaller than 32 bits (e.g. 24 bits)
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* or may be larger (e.g. 64 bits).
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*
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* Because a UElement is the size of a native pointer or a 32-bit
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* integer, we pass it around by value.
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*/
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union UElement {
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void* pointer;
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int32_t integer;
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};
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typedef union UElement UElement;
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/**
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* An element-equality (boolean) comparison function.
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* @param e1 An element (object or integer)
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* @param e2 An element (object or integer)
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* @return true if the two elements are equal.
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*/
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typedef UBool U_CALLCONV UElementsAreEqual(const UElement e1, const UElement e2);
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/**
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* An element sorting (three-way) comparison function.
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* @param e1 An element (object or integer)
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* @param e2 An element (object or integer)
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* @return 0 if the two elements are equal, -1 if e1 is < e2, or +1 if e1 is > e2.
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*/
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typedef int8_t U_CALLCONV UElementComparator(UElement e1, UElement e2);
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/**
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* An element assignment function. It may copy an integer, copy
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* a pointer, or clone a pointer, as appropriate.
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* @param dst The element to be assigned to
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* @param src The element to assign from
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*/
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typedef void U_CALLCONV UElementAssigner(UElement *dst, UElement *src);
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U_CDECL_END
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/**
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* Comparator function for UnicodeString* keys. Implements UElementsAreEqual.
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* @param key1 The string for comparison
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* @param key2 The string for comparison
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* @return true if key1 and key2 are equal, return false otherwise.
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*/
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U_CAPI UBool U_EXPORT2
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uhash_compareUnicodeString(const UElement key1, const UElement key2);
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/**
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* Comparator function for UnicodeString* keys (case insensitive).
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* Make sure to use together with uhash_hashCaselessUnicodeString.
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* Implements UElementsAreEqual.
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* @param key1 The string for comparison
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* @param key2 The string for comparison
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* @return true if key1 and key2 are equal, return false otherwise.
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*/
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U_CAPI UBool U_EXPORT2
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uhash_compareCaselessUnicodeString(const UElement key1, const UElement key2);
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#endif /* __UELEMENT_H__ */
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