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
#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#endregion
using System;
namespace Google.Protobuf
{
/// <summary>
/// Helper methods for throwing exceptions when preconditions are not met.
/// </summary>
/// <remarks>
/// This class is used internally and by generated code; it is not particularly
/// expected to be used from application code, although nothing prevents it
/// from being used that way.
/// </remarks>
public static class ProtoPreconditions
{
/// <summary>
/// Throws an ArgumentNullException if the given value is null, otherwise
/// return the value to the caller.
/// </summary>
public static T CheckNotNull<T>(T value, string name) where T : class
{
if (value == null)
{
throw new ArgumentNullException(name);
}
return value;
}
/// <summary>
/// Throws an ArgumentNullException if the given value is null, otherwise
/// return the value to the caller.
/// </summary>
/// <remarks>
/// This is equivalent to <see cref="CheckNotNull{T}(T, string)"/> but without the type parameter
/// constraint. In most cases, the constraint is useful to prevent you from calling CheckNotNull
/// with a value type - but it gets in the way if either you want to use it with a nullable
/// value type, or you want to use it with an unconstrained type parameter.
/// </remarks>
internal static T CheckNotNullUnconstrained<T>(T value, string name)
{
if (value == null)
{
throw new ArgumentNullException(name);
}
return value;
}
}
}