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//------------------------------------------------------------------------------
// <copyright file="SimpleBitVector32.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Configuration {
using System;
//
// This is a cut down copy of System.Collections.Specialized.BitVector32. The
// reason this is here is because it is used rather intensively by Control and
// WebControl. As a result, being able to inline this operations results in a
// measurable performance gain, at the expense of some maintainability.
//
[Serializable]
internal struct SimpleBitVector32 {
private int data;
internal SimpleBitVector32(int data) {
this.data = data;
}
internal int Data {
get { return data; }
#if UNUSED_CODE
set { data = value; }
#endif
}
internal bool this[int bit] {
get {
return (data & bit) == bit;
}
set {
int _data = data;
if(value) {
data = _data | bit;
}
else {
data = _data & ~bit;
}
}
}
#if UNUSED_CODE
internal void Set(int bit) {
data |= bit;
}
internal void Clear(int bit) {
data &= ~bit;
}
internal void Toggle(int bit) {
data ^= bit;
}
/*
* COPY_FLAG copies the value of flags from a source field
* into a destination field.
*
* In the macro:
* + "&flag" limits the outer xor operation to just the flag we're interested in.
* + These are the results of the two xor operations:
*
* fieldDst fieldSrc inner xor outer xor
* 0 0 0 0
* 0 1 1 1
* 1 0 1 0
* 1 1 0 1
*/
internal void Copy(SimpleBitVector32 src, int bit) {
data ^= (data ^ src.data) & bit;
}
#endif
}
}
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