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
|
//------------------------------------------------------------------------------
// <copyright file="Range.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
// <owner current="false" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------
namespace System.Data {
using System;
internal struct Range {
private int min;
private int max;
private bool isNotNull; // zero bit pattern represents null
public Range(int min, int max) {
if (min > max) {
throw ExceptionBuilder.RangeArgument(min, max);
}
this.min = min;
this.max = max;
isNotNull = true;
}
public int Count {
get {
if (IsNull)
return 0;
return max - min + 1;
}
}
public bool IsNull {
get {
return !isNotNull;
}
}
public int Max {
get {
CheckNull();
return max;
}
}
public int Min {
get {
CheckNull();
return min;
}
}
internal void CheckNull() {
if (this.IsNull) {
throw ExceptionBuilder.NullRange();
}
}
}
}
|
