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[PATCH] Minor simplification to std::_Bind_result helpers

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Mon, 10 Oct 2016 17:15:43 +0100
Subject: [PATCH] Minor simplification to std::_Bind_result helpers
Authentication-results: sourceware.org; auth=none

We don't need to define new class templates for the SFINAE helpers in
_Bind_result, we can just use alias templates. This also moves where
the helpers are used to the return types, instead of as a defaulted
argument.

	* include/std/functional (_Bind_result::__enable_if_void): Use alias
	template instead of class template.
	(_Bind_result::__disable_if_void): Likewise.
	(_Bind_result::__call): Adjust uses of __enable_if_void and
	__disable_if_void.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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