Class::mop is an implementation of a meta object protocol for the perl object system. it does not change the behavior or characteristics of the classic perl object system, but rather, establishes a protocol for its manipulation and introspection. it allows for the creation of a more complex object framework such as moose (see libmoose-perl), which was inspired by perl 6's modern object system.

contrary to popular belief, explicit mop implementations do not always result in a performance penalty. in fact, by itself, library does nothing to affect your existing code base -- you only pay for the features you use.