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[PATCH] Do not copy std:call_once arguments (LWG 2442)

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: Wed, 12 Oct 2016 12:22:25 +0100
Subject: [PATCH] Do not copy std:call_once arguments (LWG 2442)
Authentication-results: sourceware.org; auth=none

This replaces the use of std::__bind_simple by direct calls to
std::__invoke so that the arguments are not decay-copied.

	* doc/xml/manual/intro.xml: Document LWG 2442 status.
	* include/std/mutex [_GLIBCXX_HAVE_TLS] (__once_call_impl): Remove.
	[_GLIBCXX_HAVE_TLS] (_Once_call): Declare primary template and define
	partial specialization to unpack args and forward to std::invoke.
	(call_once) [_GLIBCXX_HAVE_TLS]: Use forward_as_tuple and _Once_call
	instead of __bind_simple and __once_call_impl.
	(call_once) [!_GLIBCXX_HAVE_TLS]: Use __invoke instead of
	__bind_simple.
	* testsuite/30_threads/call_once/dr2442.cc: New test.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

Follow-Ups:
- Re: [PATCH] Do not copy std:call_once arguments (LWG 2442)
  - From: Jonathan Wakely

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