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  1. using System;
  2.  
  3. interface IA {
  4. 	void f();
  5. }
  6. class B<T> where T : IA, new(){
  7. 	public void f(int n)	{
  8. 		DateTime st = DateTime.Now;
  9. 		for (int i = 0; i < n; i++){
  10. 			T a = new T();
  11. 			a.f();
  12. 		}
  13. 		Console.WriteLine((DateTime.Now - st).Milliseconds + " msec");
  14. 	}
  15. }
  16.  
  17. struct A : IA{
  18. 	public int n;
  19. 	public void f() { n++; }
  20. }
  21.  
  22. class C{
  23. 	public void f(int n){
  24. 		DateTime st = DateTime.Now;
  25. 		for (int i = 0; i < n; i++){
  26. 			IA a = new A();
  27. 			a.f();
  28. 		}
  29. 		Console.WriteLine((DateTime.Now - st).Milliseconds + " msec");
  30. 	}
  31. 	public void fT<T>(T a) where T : IA {a.f();}
  32. 	public void f2(int n){
  33. 		DateTime st = DateTime.Now;
  34. 		for (int i = 0; i < n; i++){
  35. 			fT(new A());
  36. 		}
  37. 		Console.WriteLine((DateTime.Now - st).Milliseconds + " msec");
  38. 	}
  39. }
  40.  
  41. public class Test{
  42. 	public static void Main(){
  43. 		int n = 20000000;
  44. 		B<A> b = new B<A>();
  45. 		b.f(n);
  46. 		C c = new C();
  47. 		c.f(n);
  48. 		c.f2(n);
  49. 	}
  50. }
Success #stdin #stdout 1.18s 38096KB
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98 msec
971 msec
75 msec
https://ideone.com/yhVWA
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
secret

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