Callback #delegate #callback

callback.cs

If you're used to function pointers in C, a delegate is basically a pair of pointers rolled into one:

    A pointer to an object (optional)
    A pointer to a method of that object

That means a single delegate passes all the information needed to locate a function in your program, whether it's a static method or associated with an object.

You define them like this in C#:

public delegate void FooCallbackType( int a, int b, int c );

When you want to use them, you make delegate out of the function you want to call:

class CMyClass
{
    public void FunctionToCall( int a, int b, int c )
    {
        // This is the callback
    }

    public void Foo()
    {
        FooCallbackType myDelegate = new FooCallbackType(
            this.FunctionToCall );
        // Now you can pass that to the function
        // that needs to call you back.
    }
}

///are delegates references