On Tuesday, 12 January 2016 at 22:00:32 UTC, jmh530 wrote:
On Tuesday, 12 January 2016 at 21:10:28 UTC, John Colvin wrote:

When you want to have control over the process of loading a library e.g. if you want it to be an optional dependency at runtime.

I've seen the example in the book. I'm just not sure why you would want an optional runtime dependency.

Anything in your application / library that relies on resources that may or may not be available on the user's system. E.g. plugins the user wants to load.

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