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[v3] constrain std::function constructor to only accept callable types

From: Jonathan Wakely <jwakely dot gcc at gmail dot com>
To: "libstdc++" <libstdc++ at gcc dot gnu dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Mon, 30 Apr 2012 00:16:33 +0100
Subject: [v3] constrain std::function constructor to only accept callable types

Currently we only constrain std::function's constructor to reject
integral arguments, this patch changes it to reject non-callable
arguments.  This is the proposed resolution of LWG 2132, I had already
planned to do this anyway before the issue was opened so I don't see
any need to wait for a DR.

        * include/std/functional (function::function(F)): LWG 2132: Disable
        constructor if argument isn't callable.
        * testsuite/20_util/function/cons/callable.cc: New.

Tested x86_64-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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