[patch] Use perfect forwarding in std::function's invokers

Jonathan Wakely jwakely@redhat.com
Wed Oct 29 18:40:00 GMT 2014


As pointed out in http://stackoverflow.com/q/26543242/981959 our
std::function does more copying/moving than necessary. The solution is
to use perfect forwarding for the internal invoker functions, even if
function<R(Args...)::operator() and the target function take their
arguments by value.

Tested x86_64-linux, committed to trunk.
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