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Quellcode

line 12: error: invalid use of undefined type 'struct Animal'
line 9:  error: forward declaration of 'struct Animal'

C-/C++-Quelltext

/***********************************
**     ANIMAL.H
**     ========
**
**     Deklaration der Animal-Klasse
**
************************************
*/

// Include Dateien

#include <iostream>
#include "Runner.h"

class Animal
{
    private:
        int x;
        int y;
    public:
        // Konstruktor

        Animal(int, int);

        // Destruktor

        ~Animal();

        // Methoden

        int Run();
        int Turn(int);
};

C-/C++-Quelltext

/***********************************
**     RUNNER.H
**     ========
**
**     Deklaration der Runner-Klasse
**
************************************
*/
class Animal;

class Runner : public Animal
{
    public:
        // Konstruktor

        Runner(int, int);

        // Destruktor

        ~Runner();

        // Zusätzliche Methoden

        int Run(int iSteps);
};

Quellcode

#include nested too deeply

C-/C++-Quelltext

/***********************************
**     RUNNER.H
**     ========
**
**     Deklaration der Runner-Klasse
**
************************************
*/
#ifndef ANIMAL_H_INCLUDED
#define ANIMAL_H_INCLUDED
#include "Animal.h"

class Runner : public Animal
{
    public:
        // Konstruktor

        Runner(int, int);

        // Destruktor

        ~Runner();

        // Zusätzliche Methoden

        int Run(int iSteps);
};

#endif

Quellcode

error: redefinition of 'class Animal'
error: previous definition of 'class Animal'

Quellcode

error: expected class-name before '{' token

Quellcode

error: redefinition of 'class Animal' 
error: previous definition of 'class Animal'