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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*============================================================
**
**
**
** Purpose: Enumerates the characters on a string. skips range
** checks.
**
**
============================================================*/
using System.Collections;
using System.Collections.Generic;
namespace System
{
public sealed class CharEnumerator : IEnumerator, IEnumerator<char>, IDisposable, ICloneable
{
private String _str;
private int _index;
private char _currentElement;
internal CharEnumerator(String str)
{
_str = str;
_index = -1;
}
public object Clone()
{
return MemberwiseClone();
}
public bool MoveNext()
{
if (_index < (_str.Length - 1))
{
_index++;
_currentElement = _str[_index];
return true;
}
else
_index = _str.Length;
return false;
}
public void Dispose()
{
if (_str != null)
_index = _str.Length;
_str = null;
}
Object IEnumerator.Current
{
get { return Current; }
}
public char Current
{
get
{
if (_index == -1)
throw new InvalidOperationException(SR.InvalidOperation_EnumNotStarted);
if (_index >= _str.Length)
throw new InvalidOperationException(SR.InvalidOperation_EnumEnded);
return _currentElement;
}
}
public void Reset()
{
_currentElement = (char)0;
_index = -1;
}
}
}
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