My collision detection stopped working after using polymorphism

[Missqu]

Hello everyone,
So I had class A, and class B, and external function that would check collision for me. It looked something like that

bool collision(*A a, *B )
{
  if (a->sprite.getGlobalBounds().intersects(b->sprite.getGlobalBounds()) &&
                b->sprite.getGlobalBounds().intersects(a->sprite.getGlobalBounds()))
       {
return true;
        }
}

then I made parent class and put checking collision there

bool collision(parentclass *mleczny)
{
if (this->sprite.getGlobalBounds().intersects(mleczny->sprite.getGlobalBounds()) &&
                mleczny->sprite.getGlobalBounds().intersects(this->sprite.getGlobalBounds()))
{
 return true;
}
}

but after using it on my subclass A

 a.collision(&b);

it keeps returning false. Also I had few other functions that I used in both classes and put them into my parent class and they work just fine!

[eXpl0it3r]

Use your debugger and/or add some std::cout statements, to check all the passed values.

[Missqu]

So I noticed something really weird. Passed sprites object has both width and height of 0.
so for example when I call my collision function and cout: mleczny->sprite.getGlobalbounds.height;
it will display zero, but for "this" pointer it gives correct parameters.
I think that passing object of my class somehow that object starts reffering to empty sprite ?