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comparison: ucx/cx/collection.h

ucx/cx/collection.h

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1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2023 Mike Becker, Olaf Wintermann All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28 /**
29 * \file collection.h
30 * \brief Common definitions for various collection implementations.
31 * \author Mike Becker
32 * \author Olaf Wintermann
33 * \copyright 2-Clause BSD License
34 */
35
36 #ifndef UCX_COLLECTION_H
37 #define UCX_COLLECTION_H
38
39 #include "allocator.h"
40 #include "iterator.h"
41 #include "compare.h"
42
43 #ifdef __cplusplus
44 extern "C" {
45 #endif
46
47 /**
48 * Special constant used for creating collections that are storing pointers.
49 */
50 #define CX_STORE_POINTERS 0
51
52 /**
53 * Base attributes of a collection.
54 */
55 struct cx_collection_s {
56 /**
57 * The allocator to use.
58 */
59 CxAllocator const *allocator;
60 /**
61 * The comparator function for the elements.
62 */
63 cx_compare_func cmpfunc;
64 /**
65 * The size of each element.
66 */
67 size_t elem_size;
68 /**
69 * The number of currently stored elements.
70 */
71 size_t size;
72 /**
73 * An optional simple destructor for the collection's elements.
74 *
75 * @attention Read the documentation of the particular collection implementation
76 * whether this destructor shall only destroy the contents or also free the memory.
77 */
78 cx_destructor_func simple_destructor;
79 /**
80 * An optional advanced destructor for the collection's elements.
81 *
82 * @attention Read the documentation of the particular collection implementation
83 * whether this destructor shall only destroy the contents or also free the memory.
84 */
85 cx_destructor_func2 advanced_destructor;
86 /**
87 * The pointer to additional data that is passed to the advanced destructor.
88 */
89 void *destructor_data;
90 /**
91 * Indicates if this list is supposed to store pointers
92 * instead of copies of the actual objects.
93 */
94 bool store_pointer;
95 };
96
97 /**
98 * Use this macro to declare common members for a collection structure.
99 */
100 #define CX_COLLECTION_BASE struct cx_collection_s collection
101
102 /**
103 * Sets a simple destructor function for this collection.
104 *
105 * @param c the collection
106 * @param destr the destructor function
107 */
108 #define cxDefineDestructor(c, destr) \
109 (c)->collection.simple_destructor = (cx_destructor_func) destr
110
111 /**
112 * Sets a simple destructor function for this collection.
113 *
114 * @param c the collection
115 * @param destr the destructor function
116 */
117 #define cxDefineAdvancedDestructor(c, destr, data) \
118 (c)->collection.advanced_destructor = (cx_destructor_func2) destr; \
119 (c)->collection.destructor_data = data
120
121 /**
122 * Invokes the simple destructor function for a specific element.
123 *
124 * Usually only used by collection implementations. There should be no need
125 * to invoke this macro manually.
126 *
127 * @param c the collection
128 * @param e the element
129 */
130 #define cx_invoke_simple_destructor(c, e) \
131 (c)->collection.simple_destructor((c)->collection.store_pointer ? (*((void **) (e))) : (e))
132
133 /**
134 * Invokes the advanced destructor function for a specific element.
135 *
136 * Usually only used by collection implementations. There should be no need
137 * to invoke this macro manually.
138 *
139 * @param c the collection
140 * @param e the element
141 */
142 #define cx_invoke_advanced_destructor(c, e) \
143 (c)->collection.advanced_destructor((c)->collection.destructor_data, \
144 (c)->collection.store_pointer ? (*((void **) (e))) : (e))
145
146
147 /**
148 * Invokes all available destructor functions for a specific element.
149 *
150 * Usually only used by collection implementations. There should be no need
151 * to invoke this macro manually.
152 *
153 * @param c the collection
154 * @param e the element
155 */
156 #define cx_invoke_destructor(c, e) \
157 if ((c)->collection.simple_destructor) cx_invoke_simple_destructor(c,e); \
158 if ((c)->collection.advanced_destructor) cx_invoke_advanced_destructor(c,e)
159
160 #ifdef __cplusplus
161 } // extern "C"
162 #endif
163
164 #endif // UCX_COLLECTION_H

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