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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: Antipatterns 2004-12-29
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// Compile with
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// csc /r:C5.dll Antipatterns.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 Antipatterns {
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class Antipatterns {
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public static void Main(String[] args) {
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ModifyInner();
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DontModifyInner();
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}
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// Anti-pattern: modifying an inner collection while it is a
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// member of an outer one may cause it to be lost from the outer
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// collection.
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private static void ModifyInner() {
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Console.WriteLine("\nAnti-pattern: Add to outer, modify, lose");
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ICollection<ISequenced<int>> outer = new HashSet<ISequenced<int>>();
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for (int i=0; i<100; i++) {
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ISequenced<int> inner = new TreeSet<int>();
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inner.Add(i); inner.Add(i+1);
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outer.Add(inner);
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}
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ISequenced<int>
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inner1 = new TreeSet<int>(),
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inner2 = new TreeSet<int>(),
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inner3 = new TreeSet<int>();
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inner1.AddAll<int>(new int[] { 2, 3, 5, 7, 11 });
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inner2.AddAll(inner1); inner2.Add(13);
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inner3.AddAll(inner1);
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outer.Add(inner1);
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Console.WriteLine("inner1 in outer: {0}", outer.Contains(inner1));
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Console.WriteLine("inner2 in outer: {0}", outer.Contains(inner2));
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Console.WriteLine("inner3 in outer: {0}", outer.Contains(inner3));
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inner1.Add(13);
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Console.WriteLine("inner1 equals inner2: {0}",
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outer.EqualityComparer.Equals(inner1, inner2));
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Console.WriteLine("inner1 equals inner3: {0}",
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outer.EqualityComparer.Equals(inner1, inner3));
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Console.WriteLine("inner1 in outer: {0}", outer.Contains(inner1));
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Console.WriteLine("inner2 in outer: {0}", outer.Contains(inner2));
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Console.WriteLine("inner3 in outer: {0}", outer.Contains(inner3));
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Console.WriteLine("outer.Count: {0}", outer.Count);
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}
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private static void DontModifyInner() {
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Console.WriteLine("\nMake a snapshot and add it to outer");
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ICollection<ISequenced<int>> outer = new HashSet<ISequenced<int>>();
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for (int i=0; i<100; i++) {
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ISequenced<int> inner = new TreeSet<int>();
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inner.Add(i); inner.Add(i+1);
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outer.Add(inner);
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}
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IPersistentSorted<int>
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inner1 = new TreeSet<int>(),
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inner2 = new TreeSet<int>(),
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inner3 = new TreeSet<int>();
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inner1.AddAll<int>(new int[] { 2, 3, 5, 7, 11 });
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inner2.AddAll(inner1); inner2.Add(13);
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inner3.AddAll(inner1);
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// Take a snapshot and add it to outer:
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outer.Add(inner1.Snapshot());
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Console.WriteLine("inner1 in outer: {0}", outer.Contains(inner1));
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Console.WriteLine("inner2 in outer: {0}", outer.Contains(inner2));
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Console.WriteLine("inner3 in outer: {0}", outer.Contains(inner3));
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inner1.Add(13);
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Console.WriteLine("inner1 equals inner2: {0}",
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outer.EqualityComparer.Equals(inner1, inner2));
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Console.WriteLine("inner1 equals inner3: {0}",
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outer.EqualityComparer.Equals(inner1, inner3));
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Console.WriteLine("inner1 in outer: {0}", outer.Contains(inner1));
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Console.WriteLine("inner2 in outer: {0}", outer.Contains(inner2));
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Console.WriteLine("inner3 in outer: {0}", outer.Contains(inner3));
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Console.WriteLine("outer.Count: {0}", outer.Count);
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}
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}
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}
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