Complete Modern C++ - Copy elision and how it eliminates extra copies of temporary objects

The lecture explains the concept of copy elision, a compiler optimization technique that eliminates temporary objects. It is not part of the C++ standard but is widely implemented by compilers. The instructor demonstrates copy elision using code examples, highlighting how compilers like GCC and Visual Studio handle it. The lecture covers practical implementation, compiler behavior, and advanced concepts like named return value optimization (NRVO) and return value optimization (RVO). The importance of copy and move constructors for copy elision is also discussed.

Explain how GCC allows turning off copy elision and the implications of doing so.

What is named return value optimization and how does it relate to copy elision?

How does the implementation of the add function affect the behavior of copy elision?