How to call a function in the same file of main from a function in another file

Question

I have a program with multiple headers and cpp files, I want to call a function defined in the same file main is defined (from a function defined in another file). If I'm correct, the file with the main function never has a corresponding header, right? How would I do it?

Answer 1

Why wouldn't you be allowed to have a header for functions inside main.cpp ? Assuming main.cpp defines main and foo , nothing prevents you from having a header containing the declaration of foo .

In fact, some libraries and frameworks make their own main . In cases like these, you just link against the library that contains the main .

For example, if you look at the last example code of this page of Boost's Unit Test Framework, you will see there is no main . The main is already written for you inside the Boost Unit Test Framework library.