mcs/tests/gtest-602.cs

   1 using System.Collections.Generic;
   2 using System;
   3
   4 public class Factory<TKey, TBase>
   5 {
   6         delegate T InstantiateMethod<T> ();
   7
   8         Dictionary<TKey, InstantiateMethod<TBase>> _Products = new Dictionary<TKey, InstantiateMethod<TBase>> ();
   9
  10         public void Register<T> (TKey key) where T : TBase, new()
  11         {
  12                 _Products.Add (key, Constructor<T>);
  13         }
  14
  15         public TBase Produce (TKey key)
  16         {
  17                 return _Products [key] ();
  18         }
  19
  20         static TBase Constructor<T> () where T : TBase, new()
  21         {
  22                 return new T ();
  23         }
  24 }
  25
  26 class BaseClass
  27 {
  28 }
  29
  30 class ChildClass1 : BaseClass
  31 {
  32 }
  33
  34 class ChildClass2 : BaseClass
  35 {
  36 }
  37
  38 class TestClass
  39 {
  40         public static int Main ()
  41         {
  42                 var factory = new Factory<byte, BaseClass> ();
  43                 factory.Register<ChildClass1> (1);
  44                 factory.Register<ChildClass2> (2);
  45
  46                 if (factory.Produce (1).GetType () != typeof (ChildClass1))
  47                         return 1;
  48
  49                 if (factory.Produce (2).GetType () != typeof (ChildClass2))
  50                         return 2;
  51
  52                 return 0;
  53         }
  54 }