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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | /** |
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29 | * \file tree.h |
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30 | * \brief Interface for tree implementations. |
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31 | * \author Olaf Wintermann |
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32 | * \author Mike Becker |
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33 | * \version 3.0 |
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34 | * \copyright 2-Clause BSD License |
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35 | */ |
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36 | |
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37 | #ifndef UCX_TREE_H |
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38 | #define UCX_TREE_H |
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39 | |
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40 | #include "common.h" |
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41 | #include "allocator.h" |
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42 | |
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43 | #ifdef __cplusplus |
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44 | extern "C" { |
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45 | #endif |
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46 | |
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47 | /** |
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48 | * Adds a sibling to the current tree node. |
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49 | * |
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50 | * In case your struct does not have a \p prev or a \p parent pointer, |
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51 | * specify a negative location. The location of the \p next pointer is |
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52 | * mandatory. |
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53 | * |
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54 | * \attention Do not use this function to add siblings in a tree where the |
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55 | * nodes store a pointer to the last sibling because that would not be modified by this function. |
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56 | * |
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57 | * \remark If yo do not provide a location to the parent pointer, a call to this function is |
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58 | * effectively the same as a call to cx_linked_list_add(). |
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59 | * |
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60 | * @param node a pointer to the node |
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61 | * @param loc_prev the location of a \c prev pointer within your node struct |
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62 | * @param loc_next the location of a \c next pointer within your node struct |
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63 | * @param loc_parent the location of a \c parent pointer within your node struct |
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64 | * @param new_node the new node that shall be added as a sibling |
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65 | */ |
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66 | void cx_tree_add_sibling(void *node, |
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67 | ptrdiff_t loc_prev, ptrdiff_t loc_next, |
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68 | ptrdiff_t loc_parent, |
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69 | void *new_node) |
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70 | __attribute__((__nonnull__)); |
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71 | |
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72 | /** |
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73 | * Adds a node to the list of children. |
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74 | * |
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75 | * \par Example with a full structure |
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76 | * A full tree node structure may look like this: |
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77 | * \code |
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78 | * typedef struct MyTreeNode MyTreeNode; |
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79 | * struct MyTreeNode { |
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80 | * MyTreeNode* parent; |
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81 | * MyTreeNode* first_child; |
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82 | * MyTreeNode* last_child; |
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83 | * MyTreeNode* prev_sibling; |
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84 | * MyTreeNode* next_sibling; |
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85 | * // ...contents... |
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86 | * } |
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87 | * \endcode |
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88 | * Adding a new child to a node with the above structure can be performed with the following call: |
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89 | * \code |
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90 | * MyTreeNode *node, *child; // given |
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91 | * cx_tree_add_child(&node->first_child, &node->last_child, |
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92 | * offsetof(MyTreeNode, prev_sibling), offsetof(MyTreeNode, next_sibling), |
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93 | * child, offsetof(MyTreeNode, parent), node); |
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94 | * \endcode |
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95 | * |
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96 | * \par Example with a reduced structure |
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97 | * The minimal reasonable structure with parent pointer looks like this: |
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98 | * \code |
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99 | * typedef struct MyTreeNode MyTreeNode; |
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100 | * struct MyTreeNode { |
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101 | * MyTreeNode* parent; |
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102 | * MyTreeNode* children; |
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103 | * MyTreeNode* next_sibling; |
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104 | * // ...contents... |
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105 | * } |
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106 | * \endcode |
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107 | * This simplifies the function call to: |
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108 | * \code |
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109 | * MyTreeNode *node, *child; // given |
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110 | * cx_tree_add_child(&node->children, NULL, -1, offsetof(MyTreeNode, next_sibling), |
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111 | * child, offsetof(MyTreeNode, parent), node); |
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112 | * \endcode |
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113 | * |
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114 | * \remark If your tree structure does not possess a parent pointer, a call to this function is |
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115 | * effectively the same as a call to cx_linked_list_add(). |
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116 | * |
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117 | * @param children_begin a pointer to the begin node pointer (if your list has one) |
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118 | * @param children_end a pointer to the end node pointer (if your list has one) |
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119 | * @param loc_prev the location of a \c prev pointer within your node struct |
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120 | * @param loc_next the location of a \c next pointer within your node struct |
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121 | * @param new_node a pointer to the node that shall be appended |
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122 | * @param loc_parent the location of a \c parent pointer within your node struct |
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123 | * @param parent the parent node |
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124 | */ |
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125 | void cx_tree_add_child(void **children_begin, void **children_end, |
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126 | ptrdiff_t loc_prev, ptrdiff_t loc_next, void *new_node, |
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127 | ptrdiff_t loc_parent, void *parent) |
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128 | __attribute__((__nonnull__ (5))); |
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129 | |
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130 | |
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131 | #ifdef __cplusplus |
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132 | } /* extern "C" */ |
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133 | #endif |
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134 | |
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135 | #endif /* UCX_TREE_H */ |
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parents:
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136 |