Replace apply functions with boost::mp11::mp_with_index

[mloskot]

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This is one of golden suggestions from @pdimov which I received a while ago and which we need to address:

can't all these apply functions be simplified a lot using mp_with_index? not sure what exactly they do but it looks like it.

/// \brief Given an Boost.MP11-compatible list and a dynamic index n,
/// returns the value of the n-th element.

looks like a one-liner

well, one liner in C++14, unfortunately, will have to be a two-liner here, no polymorphic lambdas :slightly_smiling_face:

[harshsingh941]

hii,i want to work on this issue. please help me

[mloskot]

If you want to work on something, you should rather know how to do it, don't you think so?

[harshsingh941]

But you can help me with that..

[mloskot]

I'm sorry but no resources for babysitting.

If you have very specific issue or question about GIL, then feel free to ask.