A function that is called before the children of a node are visited
If this function returns false the visiting will of the children will be skipped.
NOTE: If the cursor is modified (e.g. by calling cursor.children(&cursor)),
the visiting is affected. If not desired, copy the cursor using TreeCursor(cursor) before modifying it.
A function that is called before the children of a node are visited If this function returns false the visiting will of the children will be skipped.
NOTE: If the cursor is modified (e.g. by calling cursor.children(&cursor)), the visiting is affected. If not desired, copy the cursor using TreeCursor(cursor) before modifying it.