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  1. using System;
  2.  
  3. public class Test
  4. {
  5.         public static Func<T, TResult> MakeFunctionWithCounter<T, TResult>(Func<T, TResult> func)
  6.         {
  7.             int counter = 0;
  8.             return t => { counter++; return func(t); };
  9.         }
  10.  
  11.         public static int Counts<T, TResult>(Func<T, TResult> call)
  12.         {
  13.             return (int)call.Target.GetType().GetField("counter").GetValue(call.Target);
  14.         }
  15.  
  16.         static void Main(string[] args)
  17.         {
  18.             var f = new Func<double, double>(d => d*d);
  19.             f = MakeFunctionWithCounter(f);
  20.             f(1);
  21.             f(2);
  22.             f(3);
  23.             Console.WriteLine(Counts(f));
  24.        }
  25. }
Runtime error #stdin #stdout 0.03s 37616KB
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https://ideone.com/xB5GtL
language:
C# (gmcs 5.20.1)
created:
13 years ago
visibility:
public

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