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#include <glib.h> struct GNode; GNode * g_node_new (gpointer data); GNode * g_node_copy (GNode *node); gpointer (*GCopyFunc) (gconstpointer src,gpointer data); GNode * g_node_copy_deep (GNode *node,GCopyFunc copy_func,gpointer data); GNode * g_node_insert (GNode *parent,gint position,GNode *node); GNode * g_node_insert_before (GNode *parent,GNode *sibling,GNode *node); GNode * g_node_insert_after (GNode *parent,GNode *sibling,GNode *node); #define g_node_append (parent, node) GNode * g_node_prepend (GNode *parent,GNode *node); #define g_node_insert_data (parent, position, data) #define g_node_insert_data_after (parent, sibling, data) #define g_node_insert_data_before (parent, sibling, data) #define g_node_append_data (parent, data) #define g_node_prepend_data (parent, data) void g_node_reverse_children (GNode *node); void g_node_traverse (GNode *root,GTraverseType order,GTraverseFlags flags,gint max_depth,GNodeTraverseFunc func,gpointer data); enum GTraverseFlags; gboolean (*GNodeTraverseFunc) (GNode *node,gpointer data); void g_node_children_foreach (GNode *node,GTraverseFlags flags,GNodeForeachFunc func,gpointer data); void (*GNodeForeachFunc) (GNode *node,gpointer data); GNode * g_node_get_root (GNode *node); GNode * g_node_find (GNode *root,GTraverseType order,GTraverseFlags flags,gpointer data); GNode * g_node_find_child (GNode *node,GTraverseFlags flags,gpointer data); gint g_node_child_index (GNode *node,gpointer data); gint g_node_child_position (GNode *node,GNode *child); #define g_node_first_child (node) GNode * g_node_last_child (GNode *node); GNode * g_node_nth_child (GNode *node,guint n); GNode * g_node_first_sibling (GNode *node); #define g_node_next_sibling (node) #define g_node_prev_sibling (node) GNode * g_node_last_sibling (GNode *node); #define G_NODE_IS_LEAF (node) #define G_NODE_IS_ROOT (node) guint g_node_depth (GNode *node); guint g_node_n_nodes (GNode *root,GTraverseFlags flags); guint g_node_n_children (GNode *node); gboolean g_node_is_ancestor (GNode *node,GNode *descendant); guint g_node_max_height (GNode *root); void g_node_unlink (GNode *node); void g_node_destroy (GNode *root);
The GNode struct and its associated functions provide a N-ary tree data structure, where nodes in the tree can contain arbitrary data.
To create a new tree use g_node_new().
To insert a node into a tree use g_node_insert(),
g_node_insert_before(), g_node_append() and g_node_prepend().
To create a new node and insert it into a tree use
g_node_insert_data(), g_node_insert_data_after(),
g_node_insert_data_before(), g_node_append_data()
and g_node_prepend_data().
To reverse the children of a node use g_node_reverse_children().
To find a node use g_node_get_root(), g_node_find(),
g_node_find_child(), g_node_child_index(), g_node_child_position(),
g_node_first_child(), g_node_last_child(), g_node_nth_child(),
g_node_first_sibling(), g_node_prev_sibling(), g_node_next_sibling()
or g_node_last_sibling().
To get information about a node or tree use G_NODE_IS_LEAF(),
G_NODE_IS_ROOT(), g_node_depth(), g_node_n_nodes(),
g_node_n_children(), g_node_is_ancestor() or g_node_max_height().
To traverse a tree, calling a function for each node visited in the
traversal, use g_node_traverse() or g_node_children_foreach().
To remove a node or subtree from a tree use g_node_unlink() or
g_node_destroy().
struct GNode {
gpointer data;
GNode *next;
GNode *prev;
GNode *parent;
GNode *children;
};
The GNode struct represents one node in a N-ary Tree. fields
gpointer |
contains the actual data of the node. |
GNode * |
points to the node's next sibling (a sibling is another GNode with the same parent). |
GNode * |
points to the node's previous sibling. |
GNode * |
points to the parent of the GNode, or is NULL if the
GNode is the root of the tree. |
GNode * |
points to the first child of the GNode. The other
children are accessed by using the next pointer of each
child. |
GNode * g_node_new (gpointer data);
Creates a new GNode containing the given data. Used to create the first node in a tree.
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the data of the new node |
Returns : |
a new GNode |
GNode * g_node_copy (GNode *node);
Recursively copies a GNode (but does not deep-copy the data inside the
nodes, see g_node_copy_deep() if you need that).
gpointer (*GCopyFunc) (gconstpointer src,gpointer data);
A function of this signature is used to copy the node data when doing a deep-copy of a tree.
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A pointer to the data which should be copied |
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Additional data |
Returns : |
A pointer to the copy |
Since 2.4
GNode * g_node_copy_deep (GNode *node,GCopyFunc copy_func,gpointer data);
Recursively copies a GNode and its data.
|
a GNode |
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the function which is called to copy the data inside each node,
or NULL to use the original data. |
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data to pass to copy_func
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Returns : |
a new GNode containing copies of the data in node. |
Since 2.4
GNode * g_node_insert (GNode *parent,gint position,GNode *node);
Inserts a GNode beneath the parent at the given position.
GNode * g_node_insert_before (GNode *parent,GNode *sibling,GNode *node);
Inserts a GNode beneath the parent before the given sibling.
GNode * g_node_insert_after (GNode *parent,GNode *sibling,GNode *node);
Inserts a GNode beneath the parent after the given sibling.
#define g_node_append(parent, node)
Inserts a GNode as the last child of the given parent.
GNode * g_node_prepend (GNode *parent,GNode *node);
Inserts a GNode as the first child of the given parent.
#define g_node_insert_data(parent, position, data)
Inserts a new GNode at the given position.
#define g_node_insert_data_after(parent, sibling, data)
Inserts a new GNode after the given sibling.
#define g_node_insert_data_before(parent, sibling, data)
Inserts a new GNode before the given sibling.
#define g_node_append_data(parent, data)
Inserts a new GNode as the last child of the given parent.
#define g_node_prepend_data(parent, data)
Inserts a new GNode as the first child of the given parent.
void g_node_reverse_children (GNode *node);
Reverses the order of the children of a GNode. (It doesn't change the order of the grandchildren.)
|
a GNode. |
void g_node_traverse (GNode *root,GTraverseType order,GTraverseFlags flags,gint max_depth,GNodeTraverseFunc func,gpointer data);
Traverses a tree starting at the given root GNode.
It calls the given function for each node visited.
The traversal can be halted at any point by returning TRUE from func.
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the root GNode of the tree to traverse |
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the order in which nodes are visited - G_IN_ORDER,
G_PRE_ORDER, G_POST_ORDER, or G_LEVEL_ORDER. |
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which types of children are to be visited, one of
G_TRAVERSE_ALL, G_TRAVERSE_LEAVES and G_TRAVERSE_NON_LEAVES
|
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the maximum depth of the traversal. Nodes below this depth will not be visited. If max_depth is -1 all nodes in the tree are visited. If depth is 1, only the root is visited. If depth is 2, the root and its children are visited. And so on. |
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the function to call for each visited GNode |
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user data to pass to the function |
typedef enum {
G_TRAVERSE_LEAVES = 1 << 0,
G_TRAVERSE_NON_LEAVES = 1 << 1,
G_TRAVERSE_ALL = G_TRAVERSE_LEAVES | G_TRAVERSE_NON_LEAVES,
G_TRAVERSE_MASK = 0x03,
G_TRAVERSE_LEAFS = G_TRAVERSE_LEAVES,
G_TRAVERSE_NON_LEAFS = G_TRAVERSE_NON_LEAVES
} GTraverseFlags;
Specifies which nodes are visited during several of the tree
functions, including g_node_traverse() and g_node_find().
only leaf nodes should be visited. This name has
been introduced in 2.6, for older version use
G_TRAVERSE_LEAFS.
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|
only non-leaf nodes should be visited. This
name has been introduced in 2.6, for older
version use G_TRAVERSE_NON_LEAFS.
|
|
| all nodes should be visited. | |
| a mask of all traverse flags. | |
identical to G_TRAVERSE_LEAVES.
|
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identical to G_TRAVERSE_NON_LEAVES.
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gboolean (*GNodeTraverseFunc) (GNode *node,gpointer data);
Specifies the type of function passed to g_node_traverse(). The
function is called with each of the nodes visited, together with the
user data passed to g_node_traverse(). If the function returns
TRUE, then the traversal is stopped.
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a GNode. |
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user data passed to g_node_traverse(). |
Returns : |
TRUE to stop the traversal. |
void g_node_children_foreach (GNode *node,GTraverseFlags flags,GNodeForeachFunc func,gpointer data);
Calls a function for each of the children of a GNode. Note that it doesn't descend beneath the child nodes.
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a GNode |
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which types of children are to be visited, one of
G_TRAVERSE_ALL, G_TRAVERSE_LEAVES and G_TRAVERSE_NON_LEAVES
|
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the function to call for each visited node |
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user data to pass to the function |
void (*GNodeForeachFunc) (GNode *node,gpointer data);
Specifies the type of function passed to g_node_children_foreach().
The function is called with each child node, together with the user
data passed to g_node_children_foreach().
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a GNode. |
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user data passed to g_node_children_foreach(). |
GNode * g_node_get_root (GNode *node);
Gets the root of a tree.
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a GNode |
Returns : |
the root of the tree |
GNode * g_node_find (GNode *root,GTraverseType order,GTraverseFlags flags,gpointer data);
Finds a GNode in a tree.
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the root GNode of the tree to search |
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the order in which nodes are visited - G_IN_ORDER,
G_PRE_ORDER, G_POST_ORDER, or G_LEVEL_ORDER
|
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which types of children are to be searched, one of
G_TRAVERSE_ALL, G_TRAVERSE_LEAVES and G_TRAVERSE_NON_LEAVES
|
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the data to find |
Returns : |
the found GNode, or NULL if the data is not found |
GNode * g_node_find_child (GNode *node,GTraverseFlags flags,gpointer data);
Finds the first child of a GNode with the given data.
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a GNode |
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which types of children are to be searched, one of
G_TRAVERSE_ALL, G_TRAVERSE_LEAVES and G_TRAVERSE_NON_LEAVES
|
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the data to find |
Returns : |
the found child GNode, or NULL if the data is not found |
gint g_node_child_index (GNode *node,gpointer data);
Gets the position of the first child of a GNode which contains the given data.
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a GNode |
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the data to find |
Returns : |
the index of the child of node which contains
data, or -1 if the data is not found |
gint g_node_child_position (GNode *node,GNode *child);
Gets the position of a GNode with respect to its siblings.
child must be a child of node. The first child is numbered 0,
the second 1, and so on.
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a GNode |
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a child of node
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Returns : |
the position of child with respect to its siblings |
GNode * g_node_nth_child (GNode *node,guint n);
Gets a child of a GNode, using the given index.
The first child is at index 0. If the index is
too big, NULL is returned.
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a GNode |
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the index of the desired child |
Returns : |
the child of node at index n
|
GNode * g_node_first_sibling (GNode *node);
Gets the first sibling of a GNode. This could possibly be the node itself.
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a GNode |
Returns : |
the first sibling of node
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GNode * g_node_last_sibling (GNode *node);
Gets the last sibling of a GNode. This could possibly be the node itself.
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a GNode |
Returns : |
the last sibling of node
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guint g_node_depth (GNode *node);
Gets the depth of a GNode.
If node is NULL the depth is 0. The root node has a depth of 1.
For the children of the root node the depth is 2. And so on.
guint g_node_n_nodes (GNode *root,GTraverseFlags flags);
Gets the number of nodes in a tree.
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a GNode |
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which types of children are to be counted, one of
G_TRAVERSE_ALL, G_TRAVERSE_LEAVES and G_TRAVERSE_NON_LEAVES
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Returns : |
the number of nodes in the tree |
guint g_node_n_children (GNode *node);
Gets the number of children of a GNode.
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a GNode |
Returns : |
the number of children of node
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gboolean g_node_is_ancestor (GNode *node,GNode *descendant);
Returns TRUE if node is an ancestor of descendant.
This is true if node is the parent of descendant,
or if node is the grandparent of descendant etc.
guint g_node_max_height (GNode *root);
Gets the maximum height of all branches beneath a GNode. This is the maximum distance from the GNode to all leaf nodes.
If root is NULL, 0 is returned. If root has no children,
1 is returned. If root has children, 2 is returned. And so on.
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a GNode |
Returns : |
the maximum height of the tree beneath root
|
void g_node_unlink (GNode *node);
Unlinks a GNode from a tree, resulting in two separate trees.
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the GNode to unlink, which becomes the root of a new tree |
void g_node_destroy (GNode *root);
Removes root and its children from the tree, freeing any memory
allocated.
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the root of the tree/subtree to destroy |