Avoiding copy of objects with the “return” statement

Question

I have a very basic question in C++. How to avoid copy when returning an object ?

Here is an example :

std::vector test(const uns         


        

Answer 1

Compilers often can optimize away the extra copy for you (this is known as return value optimization). See https://isocpp.org/wiki/faq/ctors#return-by-value-optimization