1 // © 2016 and later: Unicode, Inc. and others. 2 // License & terms of use: http://www.unicode.org/copyright.html 3 /* 4 ******************************************************************************* 5 * Copyright (C) 1997-2011, International Business Machines 6 * Corporation and others. All Rights Reserved. 7 ******************************************************************************* 8 * file name: uelement.h 9 * encoding: UTF-8 10 * tab size: 8 (not used) 11 * indentation:4 12 * 13 * created on: 2011jul04 14 * created by: Markus W. Scherer 15 * 16 * Common definitions for UHashTable and UVector. 17 * UHashTok moved here from uhash.h and renamed UElement. 18 * This allows users of UVector to avoid the confusing #include of uhash.h. 19 * uhash.h aliases UElement to UHashTok, 20 * so that we need not change all of its code and its users. 21 */ 22 23 #ifndef __UELEMENT_H__ 24 #define __UELEMENT_H__ 25 26 #include "unicode/utypes.h" 27 28 U_CDECL_BEGIN 29 30 /** 31 * A UVector element, or a key or value within a UHashtable. 32 * It may be either a 32-bit integral value or an opaque void* pointer. 33 * The void* pointer may be smaller than 32 bits (e.g. 24 bits) 34 * or may be larger (e.g. 64 bits). 35 * 36 * Because a UElement is the size of a native pointer or a 32-bit 37 * integer, we pass it around by value. 38 */ 39 union UElement { 40 void* pointer; 41 int32_t integer; 42 }; 43 typedef union UElement UElement; 44 45 /** 46 * An element-equality (boolean) comparison function. 47 * @param e1 An element (object or integer) 48 * @param e2 An element (object or integer) 49 * @return true if the two elements are equal. 50 */ 51 typedef UBool U_CALLCONV UElementsAreEqual(const UElement e1, const UElement e2); 52 53 /** 54 * An element sorting (three-way) comparison function. 55 * @param e1 An element (object or integer) 56 * @param e2 An element (object or integer) 57 * @return 0 if the two elements are equal, -1 if e1 is < e2, or +1 if e1 is > e2. 58 */ 59 typedef int8_t U_CALLCONV UElementComparator(UElement e1, UElement e2); 60 61 /** 62 * An element assignment function. It may copy an integer, copy 63 * a pointer, or clone a pointer, as appropriate. 64 * @param dst The element to be assigned to 65 * @param src The element to assign from 66 */ 67 typedef void U_CALLCONV UElementAssigner(UElement *dst, UElement *src); 68 69 U_CDECL_END 70 71 /** 72 * Comparator function for UnicodeString* keys. Implements UElementsAreEqual. 73 * @param key1 The string for comparison 74 * @param key2 The string for comparison 75 * @return true if key1 and key2 are equal, return false otherwise. 76 */ 77 U_CAPI UBool U_EXPORT2 78 uhash_compareUnicodeString(const UElement key1, const UElement key2); 79 80 /** 81 * Comparator function for UnicodeString* keys (case insensitive). 82 * Make sure to use together with uhash_hashCaselessUnicodeString. 83 * Implements UElementsAreEqual. 84 * @param key1 The string for comparison 85 * @param key2 The string for comparison 86 * @return true if key1 and key2 are equal, return false otherwise. 87 */ 88 U_CAPI UBool U_EXPORT2 89 uhash_compareCaselessUnicodeString(const UElement key1, const UElement key2); 90 91 #endif /* __UELEMENT_H__ */ 92