//----------------------------------------------
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// NGUI: Next-Gen UI kit
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// Copyright © 2011-2014 Tasharen Entertainment
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//----------------------------------------------
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using UnityEngine;
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using System.Collections.Generic;
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using System.Diagnostics;
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/// <summary>
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/// This improved version of the System.Collections.Generic.List that doesn't release the buffer on Clear(), resulting in better performance and less garbage collection.
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/// </summary>
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public class BetterList<T>
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{
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#if UNITY_FLASH
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List<T> mList = new List<T>();
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/// <summary>
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/// Direct access to the buffer. Note that you should not use its 'Length' parameter, but instead use BetterList.size.
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/// </summary>
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public T this[int i]
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{
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get { return mList[i]; }
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set { mList[i] = value; }
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}
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/// <summary>
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/// Compatibility with the non-flash syntax.
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/// </summary>
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public List<T> buffer { get { return mList; } }
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/// <summary>
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/// Direct access to the buffer's size. Note that it's only public for speed and efficiency. You shouldn't modify it.
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/// </summary>
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public int size { get { return mList.Count; } }
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/// <summary>
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/// For 'foreach' functionality.
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/// </summary>
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public IEnumerator<T> GetEnumerator () { return mList.GetEnumerator(); }
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/// <summary>
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/// Clear the array by resetting its size to zero. Note that the memory is not actually released.
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/// </summary>
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public void Clear () { mList.Clear(); }
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/// <summary>
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/// Clear the array and release the used memory.
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/// </summary>
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public void Release () { mList.Clear(); }
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/// <summary>
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/// Add the specified item to the end of the list.
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/// </summary>
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public void Add (T item) { mList.Add(item); }
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/// <summary>
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/// Insert an item at the specified index, pushing the entries back.
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/// </summary>
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public void Insert (int index, T item) { mList.Insert(index, item); }
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/// <summary>
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/// Returns 'true' if the specified item is within the list.
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/// </summary>
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public bool Contains (T item) { return mList.Contains(item); }
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/// <summary>
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/// Remove the specified item from the list. Note that RemoveAt() is faster and is advisable if you already know the index.
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/// </summary>
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public bool Remove (T item) { return mList.Remove(item); }
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/// <summary>
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/// Remove an item at the specified index.
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/// </summary>
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public void RemoveAt (int index) { mList.RemoveAt(index); }
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/// <summary>
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/// Remove an item from the end.
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/// </summary>
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public T Pop ()
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{
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if (buffer != null && size != 0)
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{
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T val = buffer[mList.Count - 1];
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mList.RemoveAt(mList.Count - 1);
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return val;
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}
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return default(T);
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}
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/// <summary>
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/// Mimic List's ToArray() functionality, except that in this case the list is resized to match the current size.
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/// </summary>
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public T[] ToArray () { return mList.ToArray(); }
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/// <summary>
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/// List.Sort equivalent.
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/// </summary>
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public void Sort (System.Comparison<T> comparer) { mList.Sort(comparer); }
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#else
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/// <summary>
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/// Direct access to the buffer. Note that you should not use its 'Length' parameter, but instead use BetterList.size.
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/// </summary>
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public T[] buffer;
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/// <summary>
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/// Direct access to the buffer's size. Note that it's only public for speed and efficiency. You shouldn't modify it.
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/// </summary>
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public int size = 0;
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/// <summary>
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/// For 'foreach' functionality.
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/// </summary>
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[DebuggerHidden]
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[DebuggerStepThrough]
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public IEnumerator<T> GetEnumerator ()
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{
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if (buffer != null)
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{
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for (int i = 0; i < size; ++i)
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{
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yield return buffer[i];
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}
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}
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}
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/// <summary>
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/// Convenience function. I recommend using .buffer instead.
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/// </summary>
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[DebuggerHidden]
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public T this[int i]
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{
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get { return buffer[i]; }
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set { buffer[i] = value; }
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}
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/// <summary>
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/// Helper function that expands the size of the array, maintaining the content.
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/// </summary>
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void AllocateMore ()
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{
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T[] newList = (buffer != null) ? new T[Mathf.Max(buffer.Length << 1, 32)] : new T[32];
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if (buffer != null && size > 0) buffer.CopyTo(newList, 0);
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buffer = newList;
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}
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/// <summary>
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/// Trim the unnecessary memory, resizing the buffer to be of 'Length' size.
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/// Call this function only if you are sure that the buffer won't need to resize anytime soon.
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/// </summary>
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void Trim ()
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{
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if (size > 0)
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{
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if (size < buffer.Length)
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{
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T[] newList = new T[size];
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for (int i = 0; i < size; ++i) newList[i] = buffer[i];
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buffer = newList;
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}
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}
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else buffer = null;
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}
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/// <summary>
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/// Clear the array by resetting its size to zero. Note that the memory is not actually released.
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/// </summary>
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public void Clear () { size = 0; }
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/// <summary>
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/// Clear the array and release the used memory.
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/// </summary>
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public void Release () { size = 0; buffer = null; }
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/// <summary>
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/// Add the specified item to the end of the list.
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/// </summary>
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public void Add (T item)
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{
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if (buffer == null || size == buffer.Length) AllocateMore();
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buffer[size++] = item;
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}
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/// <summary>
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/// Insert an item at the specified index, pushing the entries back.
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/// </summary>
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public void Insert (int index, T item)
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{
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if (buffer == null || size == buffer.Length) AllocateMore();
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if (index < size)
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{
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for (int i = size; i > index; --i) buffer[i] = buffer[i - 1];
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buffer[index] = item;
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++size;
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}
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else Add(item);
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}
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/// <summary>
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/// Returns 'true' if the specified item is within the list.
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/// </summary>
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public bool Contains (T item)
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{
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if (buffer == null) return false;
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for (int i = 0; i < size; ++i) if (buffer[i].Equals(item)) return true;
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return false;
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}
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/// <summary>
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/// Remove the specified item from the list. Note that RemoveAt() is faster and is advisable if you already know the index.
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/// </summary>
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public bool Remove (T item)
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{
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if (buffer != null)
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{
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EqualityComparer<T> comp = EqualityComparer<T>.Default;
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for (int i = 0; i < size; ++i)
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{
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if (comp.Equals(buffer[i], item))
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{
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--size;
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buffer[i] = default(T);
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for (int b = i; b < size; ++b) buffer[b] = buffer[b + 1];
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buffer[size] = default(T);
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return true;
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}
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}
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}
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return false;
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}
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/// <summary>
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/// Remove an item at the specified index.
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/// </summary>
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public void RemoveAt (int index)
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{
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if (buffer != null && index < size)
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{
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--size;
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buffer[index] = default(T);
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for (int b = index; b < size; ++b) buffer[b] = buffer[b + 1];
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buffer[size] = default(T);
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}
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}
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/// <summary>
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/// Remove an item from the end.
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/// </summary>
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public T Pop ()
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{
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if (buffer != null && size != 0)
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{
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T val = buffer[--size];
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buffer[size] = default(T);
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return val;
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}
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return default(T);
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}
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/// <summary>
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/// Mimic List's ToArray() functionality, except that in this case the list is resized to match the current size.
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/// </summary>
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public T[] ToArray () { Trim(); return buffer; }
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//class Comparer : System.Collections.IComparer
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//{
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// public System.Comparison<T> func;
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// public int Compare (object x, object y) { return func((T)x, (T)y); }
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//}
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//Comparer mComp = new Comparer();
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/// <summary>
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/// List.Sort equivalent. Doing Array.Sort causes GC allocations.
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/// </summary>
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//public void Sort (System.Comparison<T> comparer)
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//{
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// if (size > 0)
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// {
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// mComp.func = comparer;
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// System.Array.Sort(buffer, 0, size, mComp);
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// }
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//}
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/// <summary>
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/// List.Sort equivalent. Manual sorting causes no GC allocations.
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/// </summary>
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[DebuggerHidden]
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[DebuggerStepThrough]
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public void Sort (CompareFunc comparer)
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{
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int start = 0;
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int max = size - 1;
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bool changed = true;
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while (changed)
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{
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changed = false;
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for (int i = start; i < max; ++i)
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{
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// Compare the two values
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if (comparer(buffer[i], buffer[i + 1]) > 0)
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{
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// Swap the values
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T temp = buffer[i];
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buffer[i] = buffer[i + 1];
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buffer[i + 1] = temp;
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changed = true;
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}
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else if (!changed)
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{
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// Nothing has changed -- we can start here next time
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start = (i == 0) ? 0 : i - 1;
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}
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}
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}
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}
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/// <summary>
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/// Comparison function should return -1 if left is less than right, 1 if left is greater than right, and 0 if they match.
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/// </summary>
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public delegate int CompareFunc (T left, T right);
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#endif
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}
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