C++ include and redefinition of class error

Question

I am currently programming a program which searches song according to diffrent parameters. In my system there are 2 types of songs: lyric and instrumetal. Since i need to p

Answer 1

As already answered, I would also use #pragma once, it is more convenient and clean. But be aware that it is not a C++ standard, so it can be a problem if you have to use different compilers (although it is a wide-spread extension).