[v3 patch] Implement N4502 Standard Library Support for the C++ Detection Idiom

[Jonathan Wakely]

On 01/07/15 13:25 +0100, Jonathan Wakely wrote:
>On 01/07/15 13:23 +0100, Jonathan Wakely wrote:
>>This adds the "detection idiom" API from N4502
>>
>>http://open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4502.pdf
>>
>>I've added the low-level parts to <type_traits>, with public aliases
>>in <experimental/type_traits>, so that I can use them elsewhere in the
>>library.
>
>For example this uses the new features to simplify pointer_traits.

And this does the same for allocator_traits.

Tested powerpc64le-linux, committed to trunk.
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