Use __cpp_lib_is_invocable instead of __cplusplus.
#282
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The fix for
std::result_ofbeing removed in C++20 checks__cplusplus, which isn't always set in MSVC, which also happens to be the compiler that removedstd::result_of, so it adds/Zc:__cplusplusto the command line to fix this. This creates another problem however: When using the package in Clang, which doesn't support/Zc:__cplusplus, you get an error and it doesn't work. This is a problem for vcpkg#22100.The solution is to use the feature test macro
__cpp_lib_is_invocableinstead, which tests exactly what we want to know.