Question

I’m new to C and I’m trying to use an Arraylist library. The “create Arraylist” function is giving me trouble however, because the signature makes almost no sense to me. What would be a valid function call with that signature?

This is the full signature:
Arraylist arraylist_create(const Boolean (*equals)(const Object object_1, const Object object_2))

Any help is greatly appreciated!!

Answer 1

To me the function wants another function, that will be used to compare the objects in the arraylist.

Something like this:

const Boolean my_equals(const Object object_1, const Object object_2)
{
    // Should really cast the objects to the correct type for your values
    return object_1 == object_2;  // Replace with your own comparison
}

// In main()
Arraylist arraylist = arraylist_create(my_equals);