79 lines
2.4 KiB
C#
79 lines
2.4 KiB
C#
// ==++==
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// ==--==
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//============================================================
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//
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// Class: CharEnumerator
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//
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// Purpose: Enumerates the characters on a string. skips range
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// checks.
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//
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//============================================================
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namespace System
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{
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using System.Collections;
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//| <include path='docs/doc[@for="CharEnumerator"]/*' />
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public sealed class CharEnumerator : IEnumerator, ICloneable {
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private String str;
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private int index;
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private char currentElement;
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internal CharEnumerator(String str) {
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this.str = str;
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this.index = -1;
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}
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//| <include path='docs/doc[@for="CharEnumerator.Clone"]/*' />
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public Object Clone() {
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return MemberwiseClone();
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}
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//| <include path='docs/doc[@for="CharEnumerator.MoveNext"]/*' />
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public bool MoveNext() {
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if (index < (str.Length - 1)) {
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index++;
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currentElement = str[index];
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return true;
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}
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else
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index = str.Length;
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return false;
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}
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//| <include path='docs/doc[@for="CharEnumerator.IEnumerator.Current"]/*' />
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/// <internalonly/>
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Object IEnumerator.Current {
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get {
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if (index == -1)
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throw new InvalidOperationException("InvalidOperation_EnumNotStarted");
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if (index >= str.Length)
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throw new InvalidOperationException("InvalidOperation_EnumEnded");
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return currentElement;
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}
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}
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//| <include path='docs/doc[@for="CharEnumerator.Current"]/*' />
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public char Current {
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get {
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if (index == -1)
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throw new InvalidOperationException("InvalidOperation_EnumNotStarted");
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if (index >= str.Length)
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throw new InvalidOperationException("InvalidOperation_EnumEnded");
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return currentElement;
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}
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}
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//| <include path='docs/doc[@for="CharEnumerator.Reset"]/*' />
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public void Reset() {
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currentElement = (char)0;
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index = -1;
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}
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}
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}
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