[func.wrap.ref.class] Rename the parameter `c` in `constant_wrapper<c, F>`?

[hewillk]

https://eel.is/c++draft/func.wrap.ref#class:

template<auto c, class F> constexpr function_ref(constant_wrapper<c, F>) noexcept;

The use of a lowercase c as the template parameter name here seems a bit odd to me; in libraries, we rarely seem to use a single lowercase letter as a template parameter. The c here also overlaps with the c in cv.

Would it be better to use X, or even _ (because we didn't use it at all)?

[eisenwave]

I'm pretty sure it used to be auto f before. I don't really see a problem, and it definitely shouldn't be upper X because we don't use upper case for constant template arguments.

[term-est]

It certainly looks a bit odd to me as well.

because we don't use upper case for constant template arguments

I am not sure if this is consistent. integral_constant uses lowercase, while integer_seq uses uppercase. And reflection examples seems to be using uppercase

[hewillk]

I'm pretty sure it used to be auto f before.

If it's f, then what are the names of the function parameters before? Since it's also f ?

template<auto c, class F> constexpr function_ref(constant_wrapper<c, F> f) noexcept;

and it definitely shouldn't be upper X because we don't use upper case for constant template arguments.

Did you look at the original declaration of constant_wrapper?

template<cw-fixed-value X, class>
  struct [constant_wrapper](https://eel.is/c++draft/const.wrap.class#lib:constant_wrapper) : cw-operators {