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  • An rvalue reference is a better match in all cases. This is likely a bug with GGC's ref-qualifiers. Commented Jun 16, 2013 at 7:05
  • Also, this answer might be relevant. ;) Commented Jun 16, 2013 at 7:29
  • Thank you for your detailed answer. I wish I could upvote it more than once! Commented Jun 16, 2013 at 15:53