Thread: Problem with #include dependencies

I'm having a problem with the order of my header files...

Code:

#ifndef Sphere_H
#define Sphere_H

#include "DoubleVector.h"
#include "Object.h"

typedef struct {
  DoubleVector center;
  double radius;
} SphereData;

void makeSphere (double centerX, double centerY, double centerZ, double radius, 
Object * result);

#endif // Sphere_H

Code:

#ifndef Object_H
#define Object_H

#include "Ray.h"
#include "Sphere.h"

typedef union {
  SphereData sphereType;
} ObjectData;

typedef struct {
  // Shoot fires a ray at the object and stores the t-value in t.  Returns 1 on 
success
  int (*shoot) (ObjectData const *, Ray const *, double * t);
  int (*hit) (ObjectData const *, Ray const *, double t);
} ObjectFunctions;

typedef struct {
  ObjectData objData;
  ObjectFunctions * objFunctions;
} Object;

#endif // Object_H

Notice how Object.h and Sphere.h depend on each other. This is creating a pretty irritating problem if I try to include either file. What I need is some kind of way to prototype my typedefs, but I don't know how to do this, any help

You are going to have to merge the two files...