ArraySegment.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / ArraySegment.cs / 1 / ArraySegment.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  ArraySegment 
**
** 
** Purpose: Convenient wrapper for an array, an offset, and
**          a count.  Ideally used in streams & collections.
**          Net Classes will consume an array of these.
** 
**
===========================================================*/ 
 
using System.Runtime.InteropServices;
 
namespace System {

    [Serializable]
    public struct ArraySegment 
    {
        private T[] _array; 
        private int _offset; 
        private int _count;
 
        public ArraySegment(T[] array)
        {
            if (array == null)
                throw new ArgumentNullException("array"); 

            _array = array; 
            _offset = 0; 
            _count = array.Length;
        } 

        public ArraySegment(T[] array, int offset, int count)
        {
            if (array == null) 
                throw new ArgumentNullException("array");
            if (offset < 0) 
                throw new ArgumentOutOfRangeException("offset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); 
            if (count < 0)
                throw new ArgumentOutOfRangeException("count", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); 
            if (array.Length - offset < count)
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen"));

            _array = array; 
            _offset = offset;
            _count = count; 
        } 

        public T[] Array { 
            get { return _array; }
        }

        public int Offset { 
            get { return _offset; }
        } 
 
        public int Count {
            get { return _count; } 
        }

        public override int GetHashCode()
        { 
            return _array.GetHashCode() ^ _offset   ^ _count;
        } 
 
        public override bool Equals(Object obj)
        { 
            if (obj is ArraySegment)
                return Equals((ArraySegment)obj);
            else
                return false; 
        }
 
        public bool Equals(ArraySegment obj) 
        {
            return obj._array == _array && obj._offset == _offset && obj._count == _count; 
        }

        public static bool operator ==(ArraySegment a, ArraySegment b)
        { 
            return a.Equals(b);
        } 
 
        public static bool operator !=(ArraySegment a, ArraySegment b)
        { 
            return !(a == b);
        }

    } 
}

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