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[Patch] Stop gap fix for the ISO issue with implicit moves

From: Paolo Carlini <paolo dot carlini at oracle dot com>
To: libstdc++ <libstdc++ at gcc dot gnu dot org>
Cc: Jonathan Wakely <jwakely dot gcc at gmail dot com>
Date: Tue, 12 Oct 2010 16:28:59 +0200
Subject: [Patch] Stop gap fix for the ISO issue with implicit moves

Hi,

this is a stop gap fix for this issue, which will be dealt with soon at
the ISO level:

    http://cpp-next.com/archive/2010/10/implicit-move-must-go/

Note that the current WP doesn't say that param_type is either
move-constructible or move-assignable, thus we are 100% safe.

I'm also taking the occasion to clean-up a bit the default constructor,
avoid going through _M_initialize, and push_back, etc, unnecessarily.

Tested x86_64-linux.

Thanks,
Paolo.

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