blob: 01c25f351267867e3b025a6d16da85fbeeb670f8 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
// Compiler options: -langversion:default
//
// Test for contravariance support in delegates
//
using System;
public class A {
protected string name;
public A (string name)
{
this.name = "A::" + name;
}
public A ()
{
}
public string Name {
get {
return name;
}
}
}
public class B : A {
public B (string name)
{
this.name = "B::" + name;
}
public B ()
{
}
}
public class C : B {
string value;
public C (string name, string value)
{
this.name = "C::" + name;
this.value = value;
}
public string Value {
get {
return value;
}
}
}
public class Tester {
delegate string MethodHandler (C c);
static string MethodSampleA (A value)
{
return value.Name;
}
static string MethodSampleB (B value)
{
return value.Name;
}
static string MethodSampleC (C value)
{
return value.Name + " " + value.Value;
}
public static void Main ()
{
MethodHandler da = MethodSampleA;
MethodHandler db = MethodSampleB;
MethodHandler dc = MethodSampleC;
C a = new C ("Hello", "hello");
C b = new C ("World", "world");
C c = new C ("!", "!!!");
Console.WriteLine (da (a));
Console.WriteLine (db (b));
Console.WriteLine (dc (c));
}
}
|