No, the signature of push_back accepts an object reference, while the signature of emplace_back accepts _arguments to forward to the element type’s constructor_

No, the signature of push_back accepts an object reference, while the signature of emplace_back accepts _arguments to forward to the element type’s constructor_. That means that pushback expects you to construct the object, while emplaceback wants to construct the object internally. It’s just that there’s usually a move constructor that accepts an object rvalue reference, so that case looks like it resembles the pushback API, if that makes sense....