CODEWITHSUNDEEP
c#oopobjectinheritance
cody b
cody b

Reputation: 3

c#: how to get the object that inherited the passed in object

I am making a game/game engine and encountered the following problem: i have a player that has a "checkCollision(Wall w)" method. it takes in a very simple object wall, which has some data and checks the collision with it. this works fine. but now i have this "door" object, which inherited the object "wall". this object is mostly the same but has some extra functionality. now haw can i call functions from this door object? so the door looks like: class Door : Wall {} The function checkCollsion: takes a wall as type in.: player.checkCollision(Wall w) the i pass for example Door d1 in the function: player.checkCollision(d1). now i can check the collison, and it works fine, but how do i call a function from the door passed in as wall from inside the checkCollision function? ps each object has a tag, and a walls tag = "wall" and a doors tag = "door". so i the checkCollision:

public void checkCollision(Wall w){
    if(w.tag =="wall"){
        //collision checking
    }else if(w.tag == "door"){
        //collision checking
        //this is a function only "door" has:
        w.SomeMethodOnlyDoorHasAndWallLacks();
    }
}

how can i call this function?

thanks in advance,

cody

Upvotes: 0

Views: 64

Answers (2)

Sergey Berezovskiy
Sergey Berezovskiy

Reputation: 236318

I would not inherit door from wall. Create some base object or interface and inherit both wall and door from it:

public abstract class EnvironmentObject
{
     // tag

     public bool CheckCollision()
     {
         // collision checking             
     }

     public abstract void Act();
}

Now when implementing Act in wall object you can leave it empty. In door object you can add some actions. And collision checking will look like

var objects = new EnvironmentObject[] { new Wall(), new Door() };

foreach(var obj in objects)
   if (obj.CheckCollision())
       obj.Act();

Upvotes: 2

General-Doomer
General-Doomer

Reputation: 2761

Variant 1:

public void checkCollision(Wall w){
    if(w is Door){
        //collision checking
        //this is a function only "door" has:
        (w as Door).SomeMethodOnlyDoorHasAndWallLacks();
    }else
        // wall
    }
}

Variant 2:

Define method for collision check in base class:

class Wall
{
    public virtual void CheckCollision(some arguments)
    {
        // default collision check code
    }
}

class Door : Wall
{
    public override void CheckCollision(some arguments)
    {
        // overriden collision check code
    }
}

Upvotes: 0

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