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bilsa

C# "templates"

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Hey, I was fooling around with the so called generics:
    public class CSceneGraphOperation<AcceptType>
    {
        public void CollectData<NodeType>(NodeType node)
        {
            if (node is AcceptType)
            {
                AcceptType node = (AcceptType)node;
            }
        }
}

This doesn't work... "cannot convert NodeType to AcceptType" Could someone help me out?

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Standard rules of inheritance/assignment still apply. NodeType must be a child or be of the same type as AcceptType in order to perform your assignment.


AcceptType node = (AcceptType) node;


Consider


ParentType parent = (ParentType) child;


Right, assuming Child derives from Parent.

Or.


ChildType child = (ParentType) parent;


Wrong. Can't assign a parent type to a child.

If you're attempting to declare a dual parameter template you must use syntax similar to


public class CSceneGraphOperation<AcceptType, NodeType>

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Oki, thx!

I'm just not 100% comfortable with C#, just moved from c++ :)

So I thought that the cast would work, since it would be a
forced cast... but seems to work different in C#

But it works like this:

AcceptType node = (AcceptType)(Object)node;

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Is AcceptType a base class of NodeType? In that case you could do something like this:

public class CSceneGraphOperation<AcceptType>
{
public void CollectData<NodeType>(NodeType node) where NodeType : AcceptType
{
AcceptType accept = node; // Casting to base is always well defined.
}
}

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