Fix return arguments in functions to use rvalue references.

[bryan-lunt]

See the article by Stroustrup : http://www.artima.com/cppsource/rvalue.html

Basically, if you are returning into a reference provided as an argument, you should use && references.

ex:
void myfunction(int&& return_into){...}

rather than void myfunction(int& return_into){...}

It will improve some compilation properties.

[bryan-lunt]

well.. maybe not, it seems to be a C++11 extension.