Forward Declaration of Class Members?

Hi,
I am working on a simple particle system, and am having a problem involving emitters.

The particle engine works roughly as follows:

Code:

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class Emitter;

class ParticleEngine {
    void update() {
        for (each Emitter i) {
            i->emit (this);
        }
    }

    void addParticle () {
        //...
    }
}

class Emitter {
    void emit (ParticleEngine* pe) {
        pe->addParticle ();
    }
}

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The issue here is that both classes must be able to call methods on the other class. Is there any way to do a forward declaration of a class member? The alternative would be to have emit return a list of particles to add, but this seems simpler.

Implement the functions in a source file (or two). Then, you will likely only need forward declarations in the header(s).

This looks like Java, not C++:

Code:

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for (each Emitter i) {

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If you forward declare a class, you can only refer to a pointer to it, so you'll need to use header files & .cpp files like Daved suggested.

Quote:

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Originally Posted by cpjust

This looks like Java, not C++:

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Java doesn't have the -> operator. I think it's just a bit of pseudocode.