ArraySegment.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / ArraySegment.cs / 1305376 / 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;
using System.Diagnostics.Contracts; 

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");
            Contract.EndContractBlock(); 
 
            _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")); 
            Contract.EndContractBlock();
 
            _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); 
        }
 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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