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