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using System.Collections.Generic;
using System;
public class Factory<TKey, TBase>
{
delegate T InstantiateMethod<T> ();
Dictionary<TKey, InstantiateMethod<TBase>> _Products = new Dictionary<TKey, InstantiateMethod<TBase>> ();
public void Register<T> (TKey key) where T : TBase, new()
{
_Products.Add (key, Constructor<T>);
}
public TBase Produce (TKey key)
{
return _Products [key] ();
}
static TBase Constructor<T> () where T : TBase, new()
{
return new T ();
}
}
class BaseClass
{
}
class ChildClass1 : BaseClass
{
}
class ChildClass2 : BaseClass
{
}
class TestClass
{
public static int Main ()
{
var factory = new Factory<byte, BaseClass> ();
factory.Register<ChildClass1> (1);
factory.Register<ChildClass2> (2);
if (factory.Produce (1).GetType () != typeof (ChildClass1))
return 1;
if (factory.Produce (2).GetType () != typeof (ChildClass2))
return 2;
return 0;
}
}
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