using System;
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namespace LB_VisionControls
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{
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/// <summary>
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/// Limited stack
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/// </summary>
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public class LimitedStack<T>
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{
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T[] items;
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int count;
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int start;
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/// <summary>
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/// Max stack length
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/// </summary>
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public int MaxItemCount
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{
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get { return items.Length; }
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}
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/// <summary>
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/// Current length of stack
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/// </summary>
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public int Count
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{
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get { return count; }
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}
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/// <summary>
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/// Constructor
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/// </summary>
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/// <param name="maxItemCount">Maximum length of stack</param>
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public LimitedStack(int maxItemCount)
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{
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items = new T[maxItemCount];
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count = 0;
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start = 0;
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}
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/// <summary>
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/// Pop item
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/// </summary>
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public T Pop()
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{
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if (count == 0)
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throw new Exception("Stack is empty");
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int i = LastIndex;
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T item = items[i];
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items[i] = default(T);
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count--;
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return item;
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}
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int LastIndex
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{
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get { return (start + count - 1) % items.Length; }
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}
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/// <summary>
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/// Peek item
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/// </summary>
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public T Peek()
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{
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if (count == 0)
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return default(T);
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return items[LastIndex];
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}
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/// <summary>
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/// Push item
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/// </summary>
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public void Push(T item)
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{
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if (count == items.Length)
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start = (start + 1) % items.Length;
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else
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count++;
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items[LastIndex] = item;
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}
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/// <summary>
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/// Clear stack
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/// </summary>
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public void Clear()
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{
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items = new T[items.Length];
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count = 0;
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start = 0;
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}
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public T[] ToArray()
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{
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T[] result = new T[count];
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for (int i = 0; i < count; i++)
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result[i] = items[(start + i) % items.Length];
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return result;
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}
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}
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}
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