//less-OOP
if(TheTank->bIsInGarage){
    switchWeapon(TheTank, new Gun());
}
switchWeapon(BluePlayer, new Gun());

//full OOP
if(TheTank->bIsInGarage){
    TheTank->switchWeapon(new Gun());
}
BluePlayer->switchWeapon(new Gun());

//no difference.