Copy or Assignment

B DoWork(){  B b; // with NRVO, this will be constructed directly in place, ready to return.  return b; // Otherwise, the copy constructor is called here.}{  B b; // An instance is default-constructed  b = DoWork(); // The function is called, and the return value is assigned with the assignment operator.}{  B b = DoWork(); // The local variable is copy-constructed from the result of the function call, except perhaps if the function is inlined and intelligently optimized.}