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I want to make my own array of actors.

Please consider the following code:

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int n;  // actor count

Actor *allActors;
Actor *happyActors;

allActors = getAllActorsInCollision("gameArea.0", &n);

if(allActors)
{
    int i;
    for( i = 0; i < n; i++ )
    {
        if ( allActors[i].myMood == HAPPY )
        {
            // add to happy actor array
            // ???????????????????????? 
        }
    }
}

How do I add the happy actors to my array?

Will need allocate an array of actor pointers:

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Actor *happyActors[32]; //for 32 actors max

And to add:

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happyActors[n] = allActors+i;

So, your code will look something like this:

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int n, nh = 0;

Actor *allActors;
Actor *happyActors[32]; //for 32 actors max


allActors = getAllActorsInCollision("gameArea.0", &n);

if(allActors)
{
    int i;
    for( i = 0; i < n; i++ )
    {
        if ( allActors[i].x == 0 )
        {
            // add to happy actor array
            happyActors[nh++] = allActors+i;           
        }
    }
}

//For access the data, use the operator ->

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happyActors[0]->x = 0;

Thanks mate!