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[PATCH] Define __type_identity_t alias and use for string_view


This defines the equivalent of C++2a's std::type_identity_t alias but
for use in C++11 and later. This can be used to replace __detail::__idt
in the string_view headers, which previously used common_type_t because
the one argument specialization of common_type_t was simply the identity
transform (which is no longer true).

	* include/experimental/string_view (__detail::__idt): Remove.
	(operator==, operator!=, operator<, operator>, operator<=, operator>=):
	Use __type_identity_t instead of __detail::__idt;
	* include/std/string_view (__detail::__idt): Remove.
	(operator==, operator!=, operator<, operator>, operator<=, operator>=):
	Use __type_identity_t instead of __detail::__idt;
	* include/std/type_traits (__type_identity_t): New alias template.

Tested x86_64-linux, committed to trunk.


Attachment: patch.txt
Description: Text document


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