An opaque type which identifies a specific node in a #GTree.
Gets the key stored at a particular tree node.
Returns the next in-order node of the tree, or %NULL if the passed node was already the last one.
Returns the previous in-order node of the tree, or %NULL if the passed node was already the first one.
Gets the value stored at a particular tree node.
An opaque type which identifies a specific node in a #GTree.