Addressing the limitation of the private class's constructor

[schaumb]

with template variables and lambda, it can leak out the private constructors. gcc with c++20

clang with c++20

[schaumb]

C++14 compatible gcc version

[schaumb]

MSVC is not C++ compliant, I created a ticket

[martong]

Hey, thanks again. It'd be great to have a PR for this as well. We could define a macro if clang or gcc has the required language features (or we could simply check if the standard is >=C++14).

[schaumb]

I created a C++20 fork from this repo. If someone has time to work with it, backport here.

[martong]

Okay, thank you. I am extending the readme to advertise your fork for C++20.

[martong]

Umm, not closing, since at some point we could backport to C++14.