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[v3] Define __gnu_cxx::__aligned_buffer

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: Sun, 7 Apr 2013 17:48:30 +0100
Subject: [v3] Define __gnu_cxx::__aligned_buffer

This patch adds a new utility type that wraps a member of type
std::aligned_storage and provides some convenient accessors, to
replace repeated uses of the same code in the library.

The new type should also be used in the other node-based containers
when they gain C++11 allocator support.

        * include/Makefile.am: Add ext/aligned_buffer.h
        * include/Makefile.in: Regenerate.
        * include/ext/aligned_buffer.h: New.
        * include/std/future (_Result): Use __aligned_buffer.
        * include/bits/forward_list.h (_Fwd_list_node): Likewise.
        * include/bits/shared_ptr_base.h (_Sp_counted_ptr_inplace): Likewise.
        * testsuite/20_util/shared_ptr/cons/43820_neg.cc: Adjust dg-error line
        number.

Tested x86_64-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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