copy-and-swap

问题 What is this idiom and when should it be used? Which problems does it solve? Does the idiom change when C++11 is used? Although it\'s been mentioned in many places, we didn\'t have any singular \"what is it\" question and answer, so here it is. Here is a partial list of places where it was previously mentioned: What are your favorite C++ Coding Style idioms: Copy-swap Copy constructor and = operator overload in C++: is a common function possible? What is copy elision and how it optimizes copy