C++

12.7    Separate Implementation and Definition

It is beneficial for the program's clarity if you separate definition and implementation. This even goes so far that you should put the structure definition in a header and the definition in an implementing *.cpp file (see Figure 12.2).

Figure 12.2     Splitting a class into the header and implementation.

If you need Person in multiple parts of the program, use #include "person.hpp" there to make the data type known to the compiler.

Just in case you need to include person.hpp multiple times through various includes, the surrounding lines are there:

#ifndef PERSON_HPP#define PERSON_HPP// … actual ...