Removing elements from vector

Hi there /prog/

I have a vector that looks like:
<code>
std::vector<Bullet> bullets;
</code>

My bullet struct contains the bullet ID, pixel data, and position.
I set the ID to bullets.size(); on creation.

Whenever a bullet is outside of the camera view, I call: (obviously inside of a loop)
<code>
bullets.erase(bullets.begin() + bullets[bi].ID);
</code>

This works pretty well, unless I spam bullets on the screen.  After a few bullets leave the screen, they all disappear.

What would be the best way to handle cleaning up my bullets?

bullets.erase(bullets.begin() + bullets[bi].ID);
doesn't this imply that the bullet.ID == bi
are you sure you can guarantee that when spamming
bullets.begin()+ bi might be better
if this loop looks like
for(vector<Bullet>::iterator bi;bi!=bullets.end();++bi)
{
if(something)
bullets.erase(bi);
}