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SDL_SetEventFilter?

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How do I use this function? I'm guessing that it is used to ignore some events while posting other into the queue but I'm confused as to how to implement this. For example:
int MyEventFilter( const SDL_Event *event )
{
     if ( event.type == SDL_MOUSEBUTTONDOWN )
     { return 1; // post to queue }

     return 0; // do not post
}

int main()
{
   ....
   SDL_SetEventFilter( MyEventFilter );

   for ( ;; )
   {
        // what do I do here?

        // SDL doc says not to mess with SDL_QUIT. How do I deal with that?
   }

return 0;
}

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