[patch] libstdc++/66998 Make std::experimental::not_fn SFINAE-friendly.

[Jonathan Wakely]

On 03/09/15 15:35 +0100, Jonathan Wakely wrote:
>Tested powerpc64le-linux, committed to trunk.

And gcc-5-branch.

>commit dd64ea78da1f6e92ba011605ece7cc4bb08e41cc
>Author: Jonathan Wakely <jwakely@redhat.com>
>Date:   Thu Sep 3 12:26:55 2015 +0100
>
>    Make std::experimental::not_fn SFINAE-friendly.
>
>    	PR libstdc++/66998
>    	* include/experimental/functional (_Not_fn): Add exception
>    	specifications and non-deduced return types.
>    	(not_fn): Add exception specification and wrap pointer-to-member.
>    	* testsuite/experimental/functional/not_fn.cc: Test in SFINAE context
>    	and test pointer-to-member.