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[PATCH] P0887R1 The identity metafunction


A recently-approved C++2a feature, trivial to implement.

	* include/std/type_traits (type_identity, type_identity_t): Define
       for C++2a.
	* testsuite/20_util/type_identity/requirements/alias_decl.cc: New.
	* testsuite/20_util/type_identity/requirements/
	explicit_instantiation.cc:New.
	* testsuite/20_util/type_identity/requirements/typedefs.cc: New.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document


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