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While Class::Method::Modifiers is primarily meant to wrap methods, it can also be used to wrap functions. Functions may have prototypes, so it would be better if they could be maintained in the wrapper. This works similarly to the lvalue attribute. If a before or after is applied, the wrapper takes its prototype from the sub being wrapped. If an around is applied, the modifier sub's prototype is used. This is rather strange for arounds, as the parameters it is passed will still include the wrapped sub as the first parameter, so the parameters won't match the prototype exactly. Even with that oddness, it still seems to be the best option. This also means an around could change the prototype, which will throw warnings.
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FWIW, this LGTM. There are no more warnings about prototype mismatches for my code when wrapping XS calls. |
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This allows wrapping subs that have prototypes, and maintaining the prototypes as appropriate.
There's some weird stuff in this which I'm not certain of myself, but I already wrote the code so I figured I'd have someone else look at it.