This function tells the thingy referenced by REF that it is now an object in the CLASSNAME package--or the current package if no CLASSNAME is specified, which is often the case. It returns the reference for convenience, because abless() is often the last thing in a constructor. Always use the two-argument version if the function doing the blessing might be inherited by a derived class. Seeperltoot andperlobj for more about the blessing (and blessings) of objects.
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