[Bug libstdc++/51183] pair piecewise_construct_t constructor copies

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51183

--- Comment #19 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-12-06 14:53:05 UTC ---
Nope, doesn't. I'm going to test and commit a version with the constructor
private. Thanks to both of you! By the way, it would be nice at some point to
actually analyze the assembly and the output of the passes and see which
difference by const-ref vs value makes.