blob: 2c001601b58c6ed0ed822d2d421673da7e370839 (
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
|
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
// <Area> Nullable - CastClass </Area>
// <Title> Nullable type with castclass expr </Title>
// <Description>
// checking type of GCHandle using cast expr
// </Description>
// <RelatedBugs> </RelatedBugs>
//<Expects Status=success></Expects>
// <Code>
using System.Runtime.InteropServices;
using System;
internal class NullableTest
{
private static bool BoxUnboxToNQGen<T>(T o)
{
return ((ValueType)(object)o) == null;
}
private static bool BoxUnboxToQGen<T>(T? o) where T : struct
{
return ((T?)(object)(ValueType)o) == null;
}
private static bool BoxUnboxToNQ(object o)
{
return ((ValueType)o) == null;
}
private static bool BoxUnboxToQ(object o)
{
return ((GCHandle?)(ValueType)o) == null;
}
private static int Main()
{
GCHandle? s = null;
if (BoxUnboxToNQ(s) && BoxUnboxToQ(s) && BoxUnboxToNQGen(s) && BoxUnboxToQGen(s))
return ExitCode.Passed;
else
return ExitCode.Failed;
}
}
|
