Antonio Sanchez a31effc3bc Add invoke_result and eliminate result_of warnings for C++17+.
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.
2021-02-24 21:36:14 +00:00
2018-03-11 10:01:44 -04:00
2012-07-15 10:20:59 -04:00

Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.

For more information go to http://eigen.tuxfamily.org/.

For pull request, bug reports, and feature requests, go to https://gitlab.com/libeigen/eigen.

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