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General / Collision: Erasing two sprites from two different vectors (Solved)

« on: September 19, 2015, 05:09:42 pm »

Hi everyone,

I have a problem erasing two elements when they collide. I go thru the 2 vectors of sprites and check if they have intersected with each other, if true, then I erase the two elements from the two vectors (bullets & enemies).

My problem is the following: I can erase one, but how can I erase the second one?

That is how the function looks like so far.

void collision()
  {
          for (auto e = enemies.begin(); e != enemies.end(); e++)
          {
                  for (auto i = bullets.begin(); i != bullets.end(); i++)
                  {
                          sf::FloatRect enemiez = e->getGlobalBounds();
                          sf::FloatRect bulletz = i->getGlobalBounds();

                          if (bulletz.intersects(enemiez))
                          {
                                bullets.erase(i);
              //enemies.erase(e); <-- if i uncomment this line i get a "vector iterator not incrementable!" exception.
                                break;
                          }
                  }
          }
  }
 

I understand that it is a problem with the size and the index in the vector and erasing won't work in the same iteration of the loop. I tried also to erase the enemies(e) in the outer loop, but no good.

I have no idea how else I can solve this? Should I try a totally different approach or am I on the right track?

Thank you for your help in advance!
PS This is my first project with SFML (newest version of SFML and Visual Studio 2013).