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Polymorphic pointer points to what?

C / C++ / MFC

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C Cedric Moonen

Stephen Hewitt wrote:

I don't think I need to go over this further given that the article I posted a link to explains it better than I could.

Yes sure,I agree. Thanks for article though.

Stephen Hewitt wrote:

If you've got n objects there are (n*(n-1))/2 = (n^2-n)/2 pairs to test: so it's probably a good idea to limit the size on n since the growth is quadratic.

I solved this in another way: there are only three "teams": players (ship and bullets), ennemies (ships and bullets) and neutral (bonus, and other things that doesn't have any impact on the game). So, basically this reduce a lot the pairs of collisions. And anyway these 'Resolving collisions' are done in the derived classes themselves (so, you can neglected certain pairs).

Stephen Hewitt wrote:

I don't want to get into too much of a debate however, as a lot of this is all theoretical

Yes sure. But anyway thanks for exposing your point of vue :). I find this always interesting to see how other programmers solve design 'problems' (that's what I'm doing here also, just showing you how I do that, absolutely not saying that it's the best solution :rolleyes:). But I agree with you, we won't dig into more details as it requires a concrete example and some time to spend on it.

Cédric Moonen Software developer
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Stephen Hewitt

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#21

Cedric Moonen wrote:

I solved this in another way: there are only three "teams": players (ship and bullets), ennemies (ships and bullets) and neutral (bonus, and other things that doesn't have any impact on the game).

If you make a list of objects in each "team" you’re left with a similar architecture to what I was suggesting. Having a list for the members of each of the team means you can visit the members of a team without visiting every object in the "world". Steve
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