Polymorphic API:

If this is an OO-based module, you could pass a protocol version to the constructor. (Kinda like many file formats include a version.) If it's not, you could write your own import sub and use use module "1.0.0"; instead of use module 1.0.0;. This would be a bit error prone.

Parallel APIs:

The other approach is add to the interface instead of replacing it. You can use two different module names: "module" for 1.x.x and "module2" for 2.x.x, or you can add methods instead of replacing old ones (do_something2 is the new interface for do_someting).

In reply to Re: How do you do multi-version modules? by ikegami
in thread How do you do multi-version modules? by perl-diddler

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