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30 * \brief Interface for tree implementations.
31 * \author Olaf Wintermann
34 * \copyright 2-Clause BSD License
41 #include "allocator.h"
48 * Adds a sibling to the current tree node.
50 * In case your struct does not have a \p prev or a \p parent pointer,
51 * specify a negative location. The location of the \p next pointer is
54 * \attention Do not use this function to add siblings in a tree where the
55 * nodes store a pointer to the last sibling because that would not be modified by this function.
57 * \remark If yo do not provide a location to the parent pointer, a call to this function is
58 * effectively the same as a call to cx_linked_list_add().
60 * @param node a pointer to the node
61 * @param loc_prev the location of a \c prev pointer within your node struct
62 * @param loc_next the location of a \c next pointer within your node struct
63 * @param loc_parent the location of a \c parent pointer within your node struct
64 * @param new_node the new node that shall be added as a sibling
66 void cx_tree_add_sibling(void *node,
67 ptrdiff_t loc_prev, ptrdiff_t loc_next,
70 __attribute__((__nonnull__));
73 * Adds a node to the list of children.
75 * \par Example with a full structure
76 * A full tree node structure may look like this:
78 * typedef struct MyTreeNode MyTreeNode;
81 * MyTreeNode* first_child;
82 * MyTreeNode* last_child;
83 * MyTreeNode* prev_sibling;
84 * MyTreeNode* next_sibling;
88 * Adding a new child to a node with the above structure can be performed with the following call:
90 * MyTreeNode *node, *child; // given
91 * cx_tree_add_child(&node->first_child, &node->last_child,
92 * offsetof(MyTreeNode, prev_sibling), offsetof(MyTreeNode, next_sibling),
93 * child, offsetof(MyTreeNode, parent), node);
96 * \par Example with a reduced structure
97 * The minimal reasonable structure with parent pointer looks like this:
99 * typedef struct MyTreeNode MyTreeNode;
100 * struct MyTreeNode {
101 * MyTreeNode* parent;
102 * MyTreeNode* children;
103 * MyTreeNode* next_sibling;
107 * This simplifies the function call to:
109 * MyTreeNode *node, *child; // given
110 * cx_tree_add_child(&node->children, NULL, -1, offsetof(MyTreeNode, next_sibling),
111 * child, offsetof(MyTreeNode, parent), node);
114 * \remark If your tree structure does not possess a parent pointer, a call to this function is
115 * effectively the same as a call to cx_linked_list_add().
117 * @param children_begin a pointer to the begin node pointer (if your list has one)
118 * @param children_end a pointer to the end node pointer (if your list has one)
119 * @param loc_prev the location of a \c prev pointer within your node struct
120 * @param loc_next the location of a \c next pointer within your node struct
121 * @param new_node a pointer to the node that shall be appended
122 * @param loc_parent the location of a \c parent pointer within your node struct
123 * @param parent the parent node
125 void cx_tree_add_child(void **children_begin, void **children_end,
126 ptrdiff_t loc_prev, ptrdiff_t loc_next, void *new_node,
127 ptrdiff_t loc_parent, void *parent)
128 __attribute__((__nonnull__ (5)));