How to include the same class in multiple files?

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3

Because I can’t include the same class in multiple type files like this:

#include "familia.h"
class pessoa{

private:
familia *f;
};

-----
#include "pessoa."

class familia{
private:
pessoa *p;
};
c++ classes

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1 answer

3

You are having problems because they are interdependent. You must ensure that one does not call the other indefinitely. You need to ensure that there is a class statement (you don’t need to declare it all, but that it is made explicit):

#ifndef PESSOA_H
#define PESSOA_H
class Familia;
class Pessoa {
    Familia *f;
};
#endif

And then

#ifndef FAMILIA_H
#define FAMILIA_H
class Pessoa;
class Familia {
    Pessoa *p;
};
#endif

I put in the Github for future reference.

This is called forward declaration.

Don’t forget to put guards on .cpp not to load duplicity headers.

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