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RedHat 9 (Linux i386) - man page for data::grove::parent (redhat section 3)

Data::Grove::Parent(3)					User Contributed Perl Documentation				    Data::Grove::Parent(3)

Data::Grove::Parent - provide parent properties to Data::Grove objects
use Data::Grove::Parent; $root = $object->root; $rootpath = $object->rootpath; $tied = $object->add_magic([ $parent ]); $node = Data::Grove::Parent->new($hash [, $parent]); $node_list = Data::Grove::ParentList->new($array [, $parent]);
Data::Grove::Parent is an extension to Data::Grove that adds `"Parent"' and `"Raw"' properties to Data::Grove objects and methods for returning the root node of a grove, a list of nodes between and including the root node and the current node, and a method that creates parented nodes. Data::Grove::Parent works by creating a Perl ``tied'' object that contains a parent reference (`"Parent"') and a reference to the original Data::Grove object (`"Raw"'). Tying-magic is used so that every time you reference the Data::Grove::Parent object it actually references the underlying raw object. When you retrieve a list or a property of the Raw object, Data::Grove::Parent automatically adds magic to the returned list or node. This means you only call `add_magic()' once to create the first Data::Grove::Parent object and then use the grove objects like you normally would. The most obvious use of this is so you don't have to call a `"delete"' method when you want to release a grove or part of a grove; since Data::Grove and Data::Grove::Parent objects have no cyclic references, Perl can garbage collect them normally. A secondary use is to allow you to reuse grove or property set fragments in multiple trees. WARNING: Data::Grove currently does not pro- tect you from creating your own cyclic references! This could lead to infinite loops if you don't take care to avoid them.
$object->root() $object->rootpath() `"root()"' returns the root node if `$object' is a `"Data::Grove::Parent"' object. `"rootpath()"' returns an array of all the nodes between and including the root node and `$object'. $tied = $object->add_magic([ $parent ]) `"add_magic()"' returns a "Data::Grove::Parent" object with `$object' as it's `"Raw"' object. If `$parent' is given, that becomes the tied object's parent object.
Ken MacLeod,
perl(1), Data::Grove(3) perl v5.8.0 2000-02-22 Data::Grove::Parent(3)

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