C++ class, its base class and circular include includes [duplicate]

Answer 1

The usual way is to add the following around your header files:

#ifndef FOO_H_
#define FOO_H_
#include "baseclass.h"
#include "bar.h"
class Bar;
class Foo : public baseclass {
public:
bar *varBar;
};
#endif

and

#ifndef BAR_H_
#define BAR_H_
#include "foo.h"
class Foo;
class Bar {
public:
Foo *varFoo;
};
#endif

Most compilers (gcc, VC) also accept #pragma once at the beginning of the file, but I'm pretty sure it is not part of the current C++ standard.

---

EDIT:

Sure enough, as the ISO/IEC 14882 states, a #pragma "causes the implementation to behave in an implementation-defined manner. Any pragma that is not recognized by the implementation is ignored."

It is currently still the same with C++0x.

So I would stick with the first old-fashioned way of doing that ;-)