Lessons VII : Ví dụ về quá tải toán tử trong C#:

Ví dụ về quá tải toán tử trong C#:

Quote:

1: public class zzz
2: {
3: public static void Main()
4: {
5: yyy a = new yyy(10);
6: yyy b = new yyy(5);
7: yyy c;
8: c = a + b ;
9: System.Console.WriteLine(c.i);
10: }
11: }
12:
13: public class yyy
14: {
15: public int i;
16: public yyy(int j)
17: {
18: i = j;
19: }
20:
21: public static yyy operator + (yyy x , yyy y)
22: {
23: System.Console.WriteLine(x.i);
24: yyy z = new yyy(12);
25: return z;
26: }
27: }

Mặc dù chúng ta viết mã trong C# có quá tải toán tử như vậy, nhưng trình biên dịch C# sẽ phải dịch ra ngôn ngữ trung gian IL để thực thi trên môi trường .NET. Đoạn lệnh đã được biên dịch ra như sau:

Quote:

1: .assembly my_namespace {}
2: .class private auto ansi zzz extends [mscorlib]System.Object
3: {
4: .method public hidebysig static void vijay() il managed
5: {
6: .entrypoint
7: .locals (class yyy V_0,class yyy V_1,class yyy V_2)
8: ldc.i4.s 10
9: newobj instance void yyy::.ctor(int32)
10: stloc.0
11: ldc.i4.5
12: newobj instance void yyy::.ctor(int32)
13: stloc.1
14: ldloc.0
15: ldloc.1
16: call class yyy yyy::op_Addition(class yyy,class yyy)
17: stloc.2
18: ldloc.2
19: ldfld int32 yyy::i
20: call void [mscorlib]System.Console::WriteLine(int32)
21: ret
22: ret
23: }
24: }
25:
26: .class public auto ansi yyy extends [mscorlib]System.Object
27: {
28: .field public int32 i
29: .method public hidebysig specialname static class yyy op_Addition(class yyy x,class yyy y) il managed
30: {
31: .locals (class yyy V_0,class yyy V_1)
32: ldarg.0
33: ldfld int32 yyy::i
34: call void [mscorlib]System.Console::WriteLine(int32)
35: ldc.i4.s 12
36: newobj instance void yyy::.ctor(int32)
37: stloc.0
38: ldloc.0
39: stloc.1
40: ldloc.1
41: ret
42: }
43:
44: .method public hidebysig specialname rtspecialname instance void .ctor(int32 j) il managed
45: {
46: ldarg.0
47: call instance void [mscorlib]System.Object::.ctor()
48: ldarg.0
49: ldarg.1
50: stfld int32 yyy::i
51: ret
52: }
53: }

Nortonxe(UDS)

 

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