Memory access error, in derived classes

McTomas · 08-24-2009 05:21 PM

Hello everyone

Well i'm having a big problem in manipulating memory blocks. I'll start from the beginning with the exemples of what i'm trying to fo..

I create an base enemy class and a derived enemy class.

Code:

struct Enemy {

Int pos;

Int type;

virtual void update() {}

}

struct Boss : Enemy {

virtual void update() {pos++;}

}

And i have an enemyManager where I create and manipulate my enemys, and where I have my enemys memory block.

Code:

Memb <Enemy*> enemies

void createEnemy() {

Enemy *_enemy = enemies.New();

_enemy->pos = 0;

}

the game compiles with no errors and no warnings

but when i'm running the game and I create an enemy it breaks and give me and error of memory access violation in here '_enemy->pos = 0;'

I have no ideia why it gives me that error, but i have no clue how to solve it... :?

I'll take advantage of this topic to ask anothe question... how can i have a 2D view in my camera?
Because the camera viewport is a perspective viewport with one point reference in a 3D world, how can i change it to a parallel viewport with no focus point?

best regards

McTomas

menajev · 08-24-2009 05:55 PM

McTomas Wrote:

Code:

Memb <Enemy*> enemies void createEnemy() { Enemy *_enemy //this is pointer = enemies.New(); //and this makes pointer too _enemy->pos = 0; //_enemy is pointing to nowhere }

Correct code should look like that:

Code:

Enemy* enemy = new Enemy;

enemies.add(enemy);

**Esenthel** · 08-24-2009 09:40 PM

you can also just use:
Memb<Enemy> or (Memx<Enemy> if you need constant memory addressess for objects)

Memory access error, in derived classes
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