emplacement doesn't handle lifetime management; the vector itself does this, whether you emplace or push. push_back with a stack object will copy the object, y

emplacement doesn't handle lifetime management; the vector itself does this, whether you emplace or push. push_back with a stack object will copy the object, yes. Emplace_back with a stack object will also, they are not much different. But if you emplace by creating the object inside the emplace call itself, then there is no copy. see the examples here: http://en.cppreference.com/w/cpp/container/vector/emplace_back http://en.cppreference.com/w/cpp/container/vector/emplace_ba...