SimpleBitVector32.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Util / SimpleBitVector32.cs / 1 / SimpleBitVector32.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.Util { 
    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 IntegerValue {
            get { return data; } 
            set { data = value; } 
        }
 
        internal bool this[int bit] {
            get {
                return (data & bit) == bit;
            } 
            set {
                int _data = data; 
                if(value) { 
                    data = _data | bit;
                } 
                else {
                    data = _data & ~bit;
                }
            } 
        }
 
        internal void Set(int bit) { 
            data |= bit;
        } 

        internal void Clear(int bit) {
            data &= ~bit;
        } 

#if UNUSED_CODE 
        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;
        } 

        internal int Data {
            get {
                return data; 
            }
            set { 
                data = value; 
            }
        } 
#endif
    }
}

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