I have 3 classes:
LWP::UserAgent::Cached
LWP::UserAgent::Determined
LWP::UserAgent::Proxified

All of them are direct subclasses of LWP::UserAgent. Each adds some new methods and options to LWP::UserAgent. Now I want useragent which has all this options.
How about new pragma (or may be something similar already exists?)? I would call it composition (your suggestions?). 
use composition LWP::UserAgent             =>
                LWP::UserAgent::Proxified  =>
                LWP::UserAgent::Determined =>
                LWP::UserAgent::Cached;

# now LWP::UserAgent::Cached->new() creates useragent with all support
+ed options

[download]
or even 
use composition -new                       =>
                LWP::UserAgent             =>
                LWP::UserAgent::Proxified  =>
                LWP::UserAgent::Determined =>
                LWP::UserAgent::Cached     =>
                LWP::UserAgent::Powerfull;

# LWP::UserAgent::Powerfull was autogenerated
# LWP::UserAgent::Powerfull->new() creates useragent with all supporte
+d options

[download]
This pragma will simply modify @ISA of each specified package: LWP::UserAgent::Proxified as before inherits LWP::UserAgent, LWP::UserAgent::Determined now inherits LWP::UserAgent::Proxified and LWP::UserAgent::Cached inherits LWP::UserAgent::Determined.

Any comments? Is something similar already exists?

In reply to base class manipulation: Is there something similar on CPAN? by OlegG

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