Support range-like non-awaitable coroutines

[chghehe]

Added support for coroutines like std::generator which cannot used with co_await, but might be iterated as a range.

#339

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.41%. Comparing base (eaeb89c) to head (7993b1b).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #344   +/-   ##
=======================================
  Coverage   99.40%   99.41%           
=======================================
  Files          15       15           
  Lines        1344     1361   +17     
  Branches       21       22    +1     
=======================================
+ Hits         1336     1353   +17     
  Misses          8        8           

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[rollbear]

Oh, it was that simple. I went in the completely wrong direction and made things very complicated for myself. Thank you.

I'll see if I can figure out what is causing problems with MSVC.

[rollbear]

Grr. MSVC says 199711 for __cplusplus, even when compiling with /std:c++20. See https://godbolt.org/z/3MroGTe18

However, it does correctly set __cpp_impl_coroutine, and so do the other compilers, so your PR seems works fine if I remove the check for C++20. Was there a specific reason you added this, or can I merge with the check removed?

[chghehe]

That is well known microsoft "feature" and might be solved by adding /Zc:__cplusplus compile option.
I use ranges in that header, that is why I added the check. If you think that is not necessary, feel free to remove it.

[chghehe]

Also, I tried to use macro __cpp_lib_ranges but it is defined in <version> which is available only since c++20 :)

[chghehe]

Probably, this check shall be refined with _MSC_VER and _MSC_LANG macros for MSVC... Or completely removed.

[rollbear]

Just merged it. For some reason GitHub didn't recognize this as accepting your PR, so I'm closing it. The changes are in main now, though.

[RedBeard0531]

@rollbear, would you mind cutting a release soon with this? If you could also squeeze in #351, that would be lovely 😄