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/*
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Copyright (c) 2003-2006 Niels Kokholm and Peter Sestoft
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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// C5 example: anagrams 2004-12-08
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// Compile with
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// csc /r:C5.dll CollectionSanity.cs
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using System;
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using C5;
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using SCG = System.Collections.Generic;
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namespace CollectionSanity {
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class CollectionSanity {
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public static void Main(String[] args) {
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IList<int> col1 = new LinkedList<int>(),
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col2 = new LinkedList<int>(), col3 = new LinkedList<int>();
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col1.AddAll<int>(new int[] { 7, 9, 13 });
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col2.AddAll<int>(new int[] { 7, 9, 13 });
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col3.AddAll<int>(new int[] { 9, 7, 13 });
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HashSet<IList<int>> hs1 = new HashSet<IList<int>>();
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hs1.Add(col1); hs1.Add(col2); hs1.Add(col3);
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Console.WriteLine("hs1 is sane: {0}", EqualityComparerSanity<int,IList<int>>(hs1));
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}
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// When colls is a collection of collections, this method checks
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// that all `inner' collections use the exact same equalityComparer. Note
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// that two equalityComparer objects may be functionally (extensionally)
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// identical, yet be distinct objects. However, if the equalityComparers
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// were obtained from EqualityComparer<T>.Default, there will be at most one
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// equalityComparer for each type T.
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public static bool EqualityComparerSanity<T,U>(ICollectionValue<U> colls)
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where U : IExtensible<T>
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{
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SCG.IEqualityComparer<T> equalityComparer = null;
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foreach (IExtensible<T> coll in colls) {
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if (equalityComparer == null)
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equalityComparer = coll.EqualityComparer;
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if (equalityComparer != coll.EqualityComparer)
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return false;
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}
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return true;
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}
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}
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}
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