d01d91d1ae
std::result_of creates problems when building with C++20 because it's deprecated there. The solution is to remove it and get return value type for a function with decltype. Substitute std::invoke_result for std::result_of is unnecessary because we don't have std::invoke semantics within the function - we don't work with pointer-to-member's. Reviewed by: ldionne, MikeDvorskiy, #libc Differential Revision: https://reviews.llvm.org/D118457