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CHAPTER 6 USING GLIB
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N-ary Trees
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The other type of tree data type provided by GLib is the n-ary tree, which allows a node to have any number of children. This data type is not balanced automatically; you perform management of its structure. N-ary trees are actually a collection of GNode structures. Each structure contains five objects. The first, data, is a pointer to the actual piece data stored by the node. As with most of the data types provided by GLib, you can store any type of pointer data type. typedef struct { gpointer data; GNode *next; GNode *prev; GNode *parent; GNode *children; } GNode; The other members point to other nodes within the tree. These include the next node on the same level, the previous node on the same level, the parent node, and the first child. To help you understand this relationship, Figure 6-1 shows a simple association.
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Figure 6-1. GNode relationships There is one root element in the figure, which has three children. The first child also has two children of its own. The root node points only to the first child. To access its other children, each child points to the next and previous child. Each child will also point to its parent node. You should notice that there is no pointer between the root child and its second and third children, because the parent node only points to its first child. You will need to use the next and prev pointer to access the rest of the children of a node.
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CHAPTER 6 USING GLIB
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A new n-ary tree is created with g_node_new(), which creates a tree with a single root node. Initially, all of the GNode pointers will be set to NULL for the new tree. You will need to use the function to create every node for the tree. GNode* g_node_new (gpointer data); After you create the nodes, you can use the functions shown in Table 6-5 to construct the tree with the desired structure. Table 6-5. N-ary Tree Construction Functions
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g_node_append()
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Insert a node as the last child of the parent node. This is the same thing as calling g_node_insert_before() with a sibling node of NULL. This is the same thing as calling g_node_append(), except a new node is created with the specified data. Insert a node as the child of the parent node at the specified position. If the position is -1, the node will be appended as the last child. Insert a node as the child of the parent node immediately after a sibling. If the sibling is set to NULL, the node will be prepended as the first child of the parent. Insert a node as the child of the parent node immediately before a sibling. If the sibling is set to NULL, the node will be appended as the last child of the parent. This is the same thing as calling g_node_insert(), except a new node is created with the specified data. This is the same thing as calling g_node_insert_before(), except a new node is created with the specified data. Insert a node as the first child of the parent node. This is the same thing as calling g_node_prepend(), except a new node is created with the specified data.
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g_node_append_data() g_node_insert()
g_node_insert_after()
g_node_insert_before()
g_node_insert_data() g_node_insert_data_before() g_node_prepend() g_node_prepend_data()
The structure of an n-ary tree can become quite complex. Therefore, GLib provides g_node_traverse(), which allows you to visit the nodes of a tree and call a function for each node. void g_node_traverse (GNode *root, GTraverseType order, GTraverseFlags flags, gint max_depth, GNodeTraverseFunc func, gpointer data);
CHAPTER 6 USING GLIB
When you call g_node_traverse(), you first need to specify the root node to begin searching from. This node does not necessarily have to be the root node of the tree. You next need to specify what type of traversal will occur, defined by the GTraverseType enumeration shown in the following list: G_IN_ORDER: Visit the leftmost child of the node first, moving from left to right. This is the order that nodes should be visited if you want to traverse the tree in sorted order after using a comparison function. G_PRE_ORDER: Visit the root node before visiting the left and right subtrees. The subtrees are then visited from left to right in that order. G_POST_ORDER: Visit the children of a node followed by the root node itself. This will visit all of the nodes, ending at the root node. G_LEVEL_ORDER: Visit a node and then all of its children, followed by its grandchildren, and so on. This traversal type is much more inefficient than the others, since it will not follow a natural recursive approach to traversal. The next parameter in g_node_traverse() specifies what types of child nodes will be visited, as defined by the following GTraverseFlags enumeration: G_TRAVERSE_LEAVES: Visit all of the leaves, which are the nodes with no children. This is identical to the G_TRAVERSE_LEAFS flag. G_TRAVERSE_NON_LEAVES: Visit all of the nodes that have children. This is identical to the G_TRAVERSE_NON_LEAFS flag. G_TRAVERSE_ALL: Traverse all of the nodes. This is identical to the bitwise mask of (G_TRAVERSE_LEAVES | G_TRAVERSE_NON_LEAVES). G_TRAVERSE_MASK: Include all of the traversal flags. The fourth parameter of g_node_traverse() gives the maximum depth of children from the root node that will be visited. For example, a depth of three would only visit the root node, its children, and its grandchildren. You can set the maximum depth to -1 to visit all children. You then need to specify a GNodeTraverseFunc callback that will be run for every traversed node. This function accepts a GNode corresponding to the current node and the pointer data parameter from g_node_traverse(). By returning TRUE from the traversal function, the traversal will stop. If you return FALSE, the traversal will continue if a node has not yet been visited. As with binary trees, after you are finished with the n-ary tree, you should call g_node_destroy() on the root node. This will recursively destroy all of the elements in the tree, including every child of a child and so on. g_node_destroy (node_root); GLib provides a number of other functions for interacting with trees of GNode objects. If you have a need for this object, you should reference the API documentation on the GNode data type.
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