Inheritance problem I guess

[chippzanuff93]

ok... so I had a couple of problems with my code but now I have only one left...
I tried to figure it out for hours and also searched the internet but with no luck... I really hope you guys can help me.

so here's the error:

1>game.cpp(34): error C2039: 'keyPress' : is not a member of 'Sprite'
1>          c:\users\david\documents\visual studio 2010\projects\evilmonkeys\evilmonkeys\sprite.h(18) : see declaration of 'Sprite'

now here's the code...

game.cpp

#include "game.h"
#include "drawEngine.h"

#include <windows.h>

#include <conio.h>
#include <iostream>

using namespace std;

#define GAME_SPEED 33.33 // 30 FPS

bool Game::run(void)
{
	drawArea.createSprite(0, 'O');

	player = new Character(&drawArea, 0);
	
	char key = ' ';

	posx = 0;
	
	startTime = timeGetTime();
	frameCount = 0;
	lastTime = 0;
	
	while(key != 'q')
	{
		while(!getInput(&key))
		{
			timerUpdate();
		}

		player->keyPress(key);

		// cout << "Ai apasat: " << key << endl;
	}

	delete player;
	
	cout << frameCount / ((timeGetTime() - startTime) / 1000) << " FPS" << endl;
	cout << "Se inchide aplicatia..." << endl;

	return true;
}

bool Game::getInput(char *c)
{
	if (_kbhit())
	{
		*c = _getch();
		return true;
	}
	return false;
}

void Game::timerUpdate(void)
{
	double currentTime = timeGetTime() - lastTime;

	if (currentTime < GAME_SPEED)
		return;

	frameCount++;

	lastTime = timeGetTime();
}

game.h

#ifndef GAME_H
#define GAME_H

#include "drawEngine.h"
#include "character.h"

class Game
{
public:
	bool run(void);

protected:
	bool getInput(char *c);
	void timerUpdate(void);

private:
	Sprite *player;
	
	double frameCount;
	double startTime;
	double lastTime;

	int posx;

	DrawEngine drawArea;
};

#endif 

character.h

#ifndef CHARACTER_H
#define CHARACTER_H

#include "sprite.h"

class Character : public Sprite
{
public:
	Character(DrawEngine *de, int s_index, float x = 1, float y = 1, int lives = 3, char u = 'w', char d = 's', char l = 'a', char r = 'd');
	
	virtual bool keyPress(char c);

protected:
	char upKey;
	char downKey;
	char leftKey;
	char rightKey;

};

#endif 

and finally sprite.h

#ifndef SPRITE_H
#define SPRITE_H

#include "drawEngine.h"

enum
{
	SPRITE_CLASSID,
	CHARACTER_CLASSID
};
struct vector
{
	float x;
	float y;
};

class Sprite
{
public:
	Sprite(DrawEngine *de, int s_index, float x = 1, float y = 1, int i_lives = 1);
	~Sprite();

	vector getPosition(void);
	float getX(void);
	float getY(void);

	virtual void addLives(int num = 1);
	int getLives(void);
	bool isAlive(void);

	bool move(float x, float y);

protected:
	DrawEngine *drawArea;
	vector pos;
	int spriteIndex;
	int numLives;

	int classID;
	vector facingDirection;
	void draw(float x, float y);
	void erase(float x, float y);

};

#endif 

there are 5 more files but I hope this is enough... I don't want to take more space than I already did.

I really hope someone can help me. ask me for the rest of the code if you need it (main.cpp, drawEngine.h, drawEngine.cpp, sprite.cpp, character.cpp)

[Peter87]

player is a Sprite* so you can only call the member functions of Sprite. Maybe what you want is player to be a Character*?

[TheIdeasMan]

Hi chippzanuff93,

'keyPress' : is not a member of 'Sprite'

This is exactly as it says : there is no member function keyPress in the sprite class. The problem is that keypress is defined in the derived class, but you are using a pointer to the base class. Pointers to classes work the other way around : A pointer to a derived class is a valid pointer to the base class. So make player a pointer to a character object.

[chippzanuff93]

oh guys... thank you SO MUCH for clearing my mind... I guess I was tired or my brain got melted and turned into pasta or something... thank you very much, both of you! now it works as intended!