Fix/implement C++2020 compilation, tests, and CI (#1017)

* Fix C++20 bugs and tests
* Rework CI for C++2020 tests
* Update readme compiler versions
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dmitrykobets-msft authored and GitHub committed 2021-12-09 14:54:06 -08:00
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commit bcf008ae55
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@@ -143,10 +143,10 @@ GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
#if defined(__cpp_lib_span) && __cpp_lib_span >= 202002L
template <class T, size_t extent = std::dynamic_extent>
constexpr auto at(std::span<T, extent> sp, const index i)
constexpr auto at(std::span<T, extent> sp, const index i) -> decltype(sp[sp.size()])
{
Expects(i >= 0 && i < narrow_cast<i>(sp.size()));
return sp[i];
Expects(i >= 0 && i < narrow_cast<index>(sp.size()));
return sp[gsl::narrow_cast<size_t>(i)];
}
#endif // __cpp_lib_span >= 202002L
} // namespace gsl