That sounds like dependency injection (part of the larger system of inversion of control). I hadn't thought of a formal specification for such things, but that's an interesting concept.

See perhaps Bread::Board for practical uses.

A injection framework might even export a constant of the appropriate name (LWP::UserAgent) such that the IoC registry could get the appropriate class object. Interesting.

In reply to Re: use: distinguishing compile-time vs run-time dependencies by chromatic
in thread use: distinguishing compile-time vs run-time dependencies by perl5ever

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