c#中的運算子多載

1. 1. using System;
   2. using System.Collections.Generic;
   3. using System.Text;
   5. namespace CountStrDemo
   6. {
   7.     class 比較子重載
   8.     {
   9.         public static void Main(string[] args)
   10.         { 
   11.             // 比較預算符有6個,3對 分別是:
   12.             // ==  !=
   13.             // >  <
   14.             // >= <=
   15.             //成對重載,例如,重載了 == 則必須重載 != 反回類型必須是bool
   16.         }
   18.         class MyVectorForEq
   19.         {
   20.             public int x;
   21.             public int y;
   23.             public MyVectorForEq( int x , int y )
   24.             {
   25.                 this.x = x;
   26.                 this.y = y;
   27.             }
   29.             //重載==運算子 同時必須成對重載 !=
   30.             public static bool operator == ( MyVectorForEq lobj , MyVectorForEq robj )
   31.             {
   32.                 //這裡只是做了成員值的比較,ms推薦重寫Equals方法與配合hash來進行對象內容的比較
   33.                 if (lobj.x == robj.x && lobj.y == robj.y)
   34.                 {
   35.                     return true;
   36.                 }
   37.                 else
   38.                 {
   39.                     return false;
   40.                 }
   41.             }
   43.             public static bool operator !=( MyVectorForEq lobj , MyVectorForEq robj)
   44.             {
   45.                 if (lobj.x == robj.x && lobj.y == robj.y)
   46.                 {
   47.                     return false;
   48.                 }
   49.                 else
   50.                 {
   51.                     return true;
   52.                 }
   53.             }
   54.         }
   55.     }
   56. }

   using System;

2. using System.Collections.Generic;
3. using System.Text;
5. namespace CountStrDemo
6. {
7.     class 運算浮重載
8.     {
9.         public static void Main(string[] args)
10.         {
11.             Vector vec1 = new Vector( 5 , 6 , 7 );
12.             Vector vec2 = new Vector( 2 , 2 , 2 );
14.             Vector revec = vec1 + vec2;
15.             Console.WriteLine( "x={0} y={1} z={2}" , revec.x , revec.y , revec.z );
16.             Console.Read();
17.         }
18.     }
20.     class Vector
21.     {
22.         public int x;
23.         public int y;
24.         public int z;
26.         public Vector( int x , int y  , int z )
27.         {
28.             this.x = x;
29.             this.y = y;
30.             this.z = z;
31.         }
33.         public Vector(Vector vec)
34.         {
35.             this.x = vec.x;
36.             this.y = vec.y;
37.             this.z = vec.z;
38.         }
40.         //定義重載 , 和方法類似,不過必須是public static ...可以記做沒有方法名,呵呵operator + 指重載+號運算
41.         public static Vector operator + ( Vector lvec , Vector rvec )
42.         {
43.             Vector revec = new Vector( lvec );
45.             revec.x += rvec.x;
46.             revec.y += rvec.y;
47.             revec.z += rvec.z;
49.             return revec;
50.         }
51.     }
52. }

 

-------------------------------------------------------------------------------------------------