Circular Dependencies / Incomplete Types

Question

In C++, I have a problem with circular dependencies / incomplete types. The situation is as follows:

Stuffcollection.h

#include \"Spritesheet.h\";
cl         


        

Answer 1

Use this form for your nested includes:

Stuffcollection.h

#ifndef STUFFCOLLECTION_H_GUARD
#define STUFFCOLLECTION_H_GUARD
class Spritesheet;
class Stuffcollection {
  public:
  void myfunc (Spritesheet *spritesheet);
  void myfuncTwo ();
};
#endif

Stuffcollection.cpp

#include "Stuffcollection.h"
#include "Spritesheet.h"

void Stuffcollection::myfunc(Spritesheet *spritesheet) {
  unsigned int myvar = 5 * spritesheet->spritevar;
}

void Stuffcollection::myfuncTwo() {
  //
}

Spritesheet.h

#ifndef SPRITESHEET_H_GUARD
#define SPRITESHEET_H_GUARD
class Spritesheet {
  public:
  void init();
};
#endif

Spritesheet.cpp

#include "Stuffcollection.h"
#include "Spritesheet.h"

void Spritesheet::init() {
  Stuffcollection stuffme;
  myvar = stuffme.myfuncTwo();
}

General rules I follow:

• Don't include an include from an include, dude. Prefer forward declarations if possible.
  • Exception: include system includes anywhere you want
• Have CPP include everything it needs, not relying upon H recursively including it files.
• Always use include guards.
• Never use pragma