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  1. // ===++===
  2. //
  3. //    OrtizOL
  4. //
  5. // ===--===
  6. /*============================================================
  7. //
  8. // Clase: ContraVarianza.cs
  9. //
  10. // Propósito: Demostración de la covarianza.
  11. //
  12. ============================================================*/
  13.  
  14. namespace Articulos.Cap03
  15. {
  16.     internal class Animal { };
  17.     internal class Oso : Animal { };
  18.  
  19.     internal interface IPushable<in T>
  20.     {
  21.         void Push(T obj);
  22.     }
  23.  
  24.     internal class Pila<T> : IPushable<T> 
  25.     {
  26.         public void Push(T obj) { }
  27.     }
  28.  
  29.     internal class ContraVarianza
  30.     {
  31.         public static void Main()
  32.         {
  33.             IPushable<Animal> animales = new Pila<Animal>();
  34.             IPushable<Oso> osos = animales;
  35.             osos.Push( new Oso() );
  36.         }
  37.     }
  38. }
Success #stdin #stdout 0.01s 33480KB
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https://ideone.com/uCCNnW
Demostración de la covarianza en C#.
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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