Inheritance issues

Tekkan

Unregistered

Post: #1

Jun 13, 2007 — 06:29 PM

I have run into a ridiculously frustrating problem that I feel there must be a basic solution to. Basically, say I want two classes to extend the same base class, but each class has its own .cpp and .h files. If I try to include both of the child class' header files, I get an error saying that I'm trying to redefine the base class.

This is a shortened down version of what I'm trying to do:

AnimateObject.h:

Code:

struct State

{

    bool poisoned;

    bool on_fire;

};

class AnimateObject

{

public:

    float x, y, vx, vy;

    float health;

    State status;

    AnimateObject();

    AnimateObject(float x, float y, float vx, float vy);

    // other stuff ignored

};

Player.h:

Code:

#include "AnimateObject.h"

class Player : public AnimateObject

{

public:

    Player() : AnimateObject() {};

    Player(float x, float y) : AnimateObject(x, y, 0, 0) {};

};

Enemy.h:

Code:

#include "AnimateObject.h"

class Enemy : public AnimateObject

{

public:

    Enemy() : AnimateObject() {};

    Enemy(float x, float y) : AnimateObject(x, y, 0, 0) {};

};

Now in main.cpp, I obviously want to be able to create both a Player and an Enemy object, but I can't, because if I try:

Code:

#include "Player.h"

#include "Enemy.h"

I get an error stating "previous redefinition of struct State" and "previous redefinition of class AnimateObject".

There has to be a simple way around this, right?

OneSadCookie

Luminary

Posts: 5,131
Joined: 2002.04

Post: #2

Jun 13, 2007 — 06:34 PM

Code:

#ifndef MyHeaderName

#define MyHeaderName

// header's code goes here

#endif

Cochrane

Member

Posts: 114
Joined: 2005.03

Post: #3

Jun 16, 2007 — 02:01 AM

Code:

#pragma once

Tekkan

Unregistered

Post: #4

Jun 16, 2007 — 06:30 PM

Thanks, guys. Google had failed me with this information.

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