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  1. using System;
  2. using System.Numerics;
  3.  
  4. public class Test
  5. {
  6.     class Program
  7.     {
  8.         static void Main(string[] args)
  9.         {
  10.             Console.WriteLine(Operation.Add(2, 2));
  11.             Console.WriteLine(Operation.Add(1.2, 3.4));
  12.         }
  13.     }
  14.  
  15.     class Operation
  16.     {
  17.         public static T Add<T>(T t1, T t2) => OperationImpl<T>.add(t1, t2);
  18.         public static T Subtract<T>(T t1, T t2) => OperationImpl<T>.subtract(t1, t2);
  19.  
  20.         class OperationImpl<T>
  21.         {
  22.             public static Func<T, T, T> add, subtract;
  23.  
  24.             static Func<T, T, T> ForceCast<U>(Func<U, U, U> f) => (Func<T, T, T>)(object)f;
  25.  
  26.             static OperationImpl()
  27.             {
  28.                 if (typeof(T) == typeof(int))
  29.                 {
  30.                     add = ForceCast<int>((x, y) => x + y);
  31.                     subtract = ForceCast<int>((x, y) => x - y);
  32.                 }
  33.                 else if (typeof(T) == typeof(double))
  34.                 {
  35.                     add = ForceCast<double>((x, y) => x + y);
  36.                     subtract = ForceCast<double>((x, y) => x - y);
  37.                 }
  38.                 else if (typeof(T) == typeof(Complex))
  39.                 {
  40.                     add = ForceCast<Complex>((x, y) => x + y);
  41.                     subtract = ForceCast<Complex>((x, y) => x - y);
  42.                 }
  43.                 else
  44.                 {
  45.                     throw new NotSupportedException(
  46.                     	$"Operations on type {typeof(T).Name} are not supported");
  47.                 }
  48.             }
  49.         }
  50.     }
  51. }
Success #stdin #stdout 0.01s 131776KB
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4
4.6
https://ideone.com/XOea6Z
language:
C# (gmcs 5.20.1)
created:
6 years ago
visibility:
public

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