Iterator for entities

[AggrorJorn]

I am iterating through a list of LE3 Models. I had some trouble getting the position of every object during an iteration. I finnaly found something that works, but it looks really nasty. There must be a different way of accessing LE3 commands but I haven't found another way.

 

list<Model*>::iterator it;
for(it=roadBlocks.begin(); it != roadBlocks.end(); ++it)
{
 it._Ptr->_Myval->GetPosition()

 

Also when I debug, this is how it looks:

[Rick]

I usually do the following with the iter

 

(*iter)->GetPosition(), but not sure if that works with Leadwerks 3. Haven't tried.

[AggrorJorn]

Ah the parentheses around the *iter are necessary. I hadn't tried one.

 

thanks for the help Rick.

[Rick]

If I need to do a bunch of things to the pointer in the loop I'll do:

 

Model* mdl = (*iter);

 

at the top of the loop so I can just work with mdl-> instead of (*iter)-> which is just easier.

[AggrorJorn]

Thanks for the suggestion. Still have a question about this: if we put '*' before the variable, don't we de-reference it? Why can we still access functions then via the -> notation?

[Josh]

It's a pointer, so it's the same object. I usually do this:

list<Entity*>::iterator entity;        
for (entity = entities.begin(); entity != entities.end(); entity++)
{
   Vec3 position = (*entity)->GetPosition();
}

[Furbolg]

The problem is if you write " *it->MyMethod() " (example to show the problem) then c++ will try to use " * " (asterisk) on MyMethod but you want it on " it ", so you have to write (*it) to deferencing the iterator.

 

 

// Edit: to clarify

 

you could write something like this

 

Mycallback = &(*it)->GetMethodToCallBack();

[Rick]

@Aggror Like Furblog says, you aren't deferencing the actual type by doing that, but the iterator itself. Once you do that then you have a pointer of the type you actually care about.

[AggrorJorn]

De-referencing a pointer can result in to another pointer. I didn't know that. Thanks everyone. Learned something new here.

[shadmar]

I did not get() *it, but good::point