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January 20th, 2014, 07:23 PM
#1
Problems with iterators
So I have this problem with not being able to iterate over a vector in a nestled for-loop. Here's the nestled for-loop:
bool innerHit = false;
for (std::vector<Sprite*>::iterator outerIter = sprites.begin(); outerIter != sprites.end() && (!sprites.empty()); outerIter++)
{
Sprite* spriteOne = *outerIter;
for (std::vector<Sprite*>::reverse_iterator innerIter = sprites.rbegin(); innerIter != sprites.rend() && (!sprites.empty()); innerIter++)
{
Sprite* spriteTwo = *innerIter;
if (spriteOne->getRect() != spriteTwo->getRect() && spriteOne->getRect().overlaps(spriteTwo->getRect()) && spriteOne != spriteTwo)
{
spriteOne->collisionReaction(spriteTwo);
spriteTwo->collisionReaction(spriteOne);
spriteOne->collisionDestroy(sprites);
spriteTwo->collisionDestroy(sprites);
innerHit = true;
}
if (innerHit)
break;
}
}
What happens is, after having called the collisionDestroy-function and the program tries to execute the nest loop in the outer for-loop, it all crashes with the text "Expression: vector iterator not decrementable", which I understand is because the iterator will have already become useless. The question is: know this, how do I fix it? I can't seem to get a hang of it.
Here's the collisionDestroy-function (the collisionReaction does nothing but sets a few local variables):
void Enemy::collisionDestroy(std::vector<Sprite*>& sprites)
{
for (std::vector<Sprite*>::iterator iter = sprites.begin(); iter != sprites.end(); iter++)
{
Enemy* tmp = dynamic_cast<Enemy*>(*iter);
if (this == tmp && collisionType == 3 || collisionType == 1)
{
sprites.erase(iter);
break;
}
}
}
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