Quick A: When correctly implemented per the standard, you get in-place construction with perfect forwarding.

Longer question:

push_back vs emplace_back

I'm a bit confused regarding the difference between push_back and emplace_back.

 

void emplace_back(Type&& _Val);
void push_back(const Type& _Val);
void push_back(Type&& _Val);

As there is a push_back overload taking a rvalue reference I don't quite see what the purpose of emplace_back becomes?