Getting around copy semantics in C++

Question

Please consider this code:

class A
{

};

int main()
{
    std::vector test;
    test.push_back(A());
}

The constructor and destructor

Answer 1

Use emplace_back.

std::vector test;
test.emplace_back();
//test.emplace_back(constructor, parameters);

This way, A will be constructed in-place, so no copy or move will occur.

Edit: To clarify on the comments on the question - No, this will not change from push_back if you pass it a temporary. For instance,

test.emplace_back(A{});

Will, in C++11, cause a temporary A to be constructed, moved and destroyed, as if you used push_back.