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[v3] (almost) finish <scoped_allocator>

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: Fri, 19 Oct 2012 17:16:51 +0100
Subject: [v3] (almost) finish <scoped_allocator>

This adds support for piecewise construction of std::pair by
scoped_allocator_adaptor.  The only thing missing from
scoped_allocator_adaptor now is that my definition of OUTERMOST isn't
recursive so doesn't work for nested scoped_allocator_adaptors.
That's a suitably obscure use case that I'm not going to rush to fix
it today.

        * include/std/scoped_allocator (__outermost_alloc_traits): Define.
        (scoped_allocator_adaptor::destroy): Use it.
        (scoped_allocator_adaptor::construct): Likewise. Overload for
        piecewise construction of std::pair objects.
        * testsuite/20_util/scoped_allocator/2.cc: New.

Tested x86_64-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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