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| Recipe 5.3: Declaring Destructors |
Last Updated: Sep 8, 2003
Status: Draft
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Problem:
You want to create one or more destructors for your class: methods that are automatically invoked when an object is about to be garbage collected.
Solution:
Use the DESTROY keyword:
class MyClass is ParentClass {
DESTROY { ... }
}
Discussion:
Destructors in Perl6 are defined using DESTROY. Destructors are autochained, such that destructors for parent classes are invoked automatically after your subclass destructor is called.
You don't have to put a DESTROY method in a class. Any parent DESTROY methods will still be called, in the proper order.
For the above example, therefore, the destruction of an object happens like this:
- The
DESTROY method of MyClass is invoked.
- The
DESTROY method of ParentClass is invoked.
- The
DESTROY method of Object, the root class, is invoked.
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