boostorg/callable_traits

Consider adding a way to retrieve parameter list without the class type

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Opened to track comment in https://lists.boost.org/Archives/boost/2017/04/234374.php:

I've a feeling that it might also be useful to provide an extractor that, for member pointers, returns just the arguments without the class.

Right now, args_t<void(foo::*)(float, char)> is std::tuple<foo&, float, char>. It might be useful to provide a way of retrieving the argument list without the type of *this, such that one would get std::tuple<float, char>.

hii
This is my first time contributing this project .
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