Lambda Collections Generic Set : ICollection « Collections Data Structure « C# / C Sharp

1. C# / C Sharp
2. Collections Data Structure
3. ICollection

Lambda Collections Generic Set

      
// Copyright (c) 2002,2003,2004, R?diger Klaehn
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// 
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#region Using directives

using System;
using System.Collections;
using System.Collections.Generic;

#endregion

namespace Lambda.Collections.Generic
{
  [Serializable]
  public class Set<T> : ICollection<T>, IEnumerable<T>,
                        ICollection, IEnumerable
  {
    [Serializable]    
    private struct Dummy
    {
    }

    private static Dummy dummy = new Dummy();
    private Dictionary<T, Dummy> data;

    public Set()
    {
      data = new Dictionary<T, Dummy>();
    }

    public Set(int capacity)
    {
      data = new Dictionary<T, Dummy>(capacity);
    }

    public Set(Set<T> original)
    {
      data = new Dictionary<T, Dummy>(original.data);
    }

    public Set(IEnumerable<T> original)
    {
      data = new Dictionary<T, Dummy>();
      AddRange(original);
    }

    public int Count
    {
      get { return data.Count; }
    }

    public void Add(T a)
    {
      data[a] = dummy;
    }

    public void AddRange(IEnumerable<T> range)
    {
      foreach (T a in range)
        Add(a);
    }

    public Set<U> ConvertAll<U>(Converter<T, U> converter)
    {
      Set<U> result = new Set<U>(this.Count);
      foreach (T element in this)
        result.Add(converter(element));
      return result;
    }

    public bool TrueForAll(Predicate<T> predicate)
    {
      foreach (T element in this)
        if (!predicate(element))
          return false;
      return true;
    }

    public Set<T> FindAll(Predicate<T> predicate)
    {
      Set<T> result = new Set<T>();
      foreach (T element in this)
        if (predicate(element))
          result.Add(element);
      return result;
    }

    public void ForEach(Action<T> action)
    {
      foreach (T element in this)
        action(element);
    }

    public void Clear()
    {
      data.Clear();
    }

    public bool Contains(T a)
    {
      return data.ContainsKey(a);
    }

    public void CopyTo(T[] array, int index)
    {
      data.Keys.CopyTo(array, index);
    }

    public bool Remove(T a)
    {
      return data.Remove(a);
    }

    public IEnumerator<T> GetEnumerator()
    {
      return data.Keys.GetEnumerator();
    }

    public bool IsReadOnly
    {
      get { return false; }
    }

    public static Set<T> operator |(Set<T> a, Set<T> b)
    {
      Set<T> result = new Set<T>(a);
      result.AddRange(b);
      return result;
    }

    public Set<T> Union(IEnumerable<T> b)
    {
      return this | new Set<T>(b);
    }

    public static Set<T> operator &(Set<T> a, Set<T> b)
    {
      Set<T> result = new Set<T>();
      foreach (T element in a)
        if (b.Contains(element))
          result.Add(element);
      return result;
    }

    public Set<T> Intersection(IEnumerable<T> b)
    {
      return this & new Set<T>(b);
    }

    public static Set<T> operator -(Set<T> a, Set<T> b)
    {
      Set<T> result = new Set<T>();
      foreach (T element in a)
        if (!b.Contains(element))
          result.Add(element);
      return result;
    }

    public Set<T> Difference(IEnumerable<T> b)
    {
      return this - new Set<T>(b);
    }

    public static Set<T> operator ^(Set<T> a, Set<T> b)
    {
      Set<T> result = new Set<T>();
      foreach (T element in a)
        if (!b.Contains(element))
          result.Add(element);
      foreach (T element in b)
        if (!a.Contains(element))
          result.Add(element);
      return result;
    }

    public Set<T> SymmetricDifference(IEnumerable<T> b)
    {
      return this ^ new Set<T>(b);
    }

    public static Set<T> Empty
    {
      get { return new Set<T>(0); }
    }

    public static bool operator <=(Set<T> a, Set<T> b)
    {
      foreach (T element in a)
        if (!b.Contains(element))
          return false;
      return true;
    }

    public static bool operator <(Set<T> a, Set<T> b)
    {
      return (a.Count < b.Count) && (a <= b);
    }

    public static bool operator >(Set<T> a, Set<T> b)
    {
      return b < a;
    }

    public static bool operator >=(Set<T> a, Set<T> b)
    {
      return (b <= a);
    }

    public override bool Equals(object obj)
    {
      Set<T> a = this;
      Set<T> b = obj as Set<T>;
      if (b == null)
        return false;
      return a == b;
    }

    public override int GetHashCode()
    {
      int hashcode = 0;
      foreach (T element in this)
        hashcode ^= element.GetHashCode();
      return hashcode;
    }

    void ICollection.CopyTo(Array array, int index)
    {
      ((ICollection) data.Keys).CopyTo(array, index);
    }

    object ICollection.SyncRoot
    {
      get { return ((ICollection) data.Keys).SyncRoot; }
    }

    bool ICollection.IsSynchronized
    {
      get { return ((ICollection) data.Keys).IsSynchronized; }
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
      return ((IEnumerable) data.Keys).GetEnumerator();
    }
  }
}

   
    
    
    
    
    
  

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