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a31effc3bc
The `std::result_of` meta struct is deprecated in C++17 and removed in C++20. It was still slipping through due to a faulty definition of `EIGEN_HAS_STD_RESULT_OF`. Added a new macro `EIGEN_HAS_STD_INVOKE_RESULT` and `Eigen::internal::invoke_result` implementation with fallback for pre C++17. Replaces the `result_of` definition with one based on `std::invoke_result` for C++17 and higher. For completeness, added nullary op support for c++03. Fixes #1850.