-/*\r
- Copyright (c) 2003-2006 Niels Kokholm and Peter Sestoft\r
- Permission is hereby granted, free of charge, to any person obtaining a copy\r
- of this software and associated documentation files (the "Software"), to deal\r
- in the Software without restriction, including without limitation the rights\r
- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\r
- copies of the Software, and to permit persons to whom the Software is\r
- furnished to do so, subject to the following conditions:\r
- \r
- The above copyright notice and this permission notice shall be included in\r
- all copies or substantial portions of the Software.\r
- \r
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r
- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r
- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r
- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\r
- SOFTWARE.\r
-*/\r
-\r
-// C5 example: hash codes, good and bad 2005-02-28\r
-\r
-// Compile with \r
-// csc /r:C5.dll HashCodes.cs \r
-\r
-using System;\r
-using C5;\r
-using SCG = System.Collections.Generic;\r
-\r
-namespace MyHashCodesTest {\r
- class MyTest {\r
- public static void Main(String[] args) {\r
- int count = int.Parse(args[0]); \r
- {\r
- Console.Write("Good hash function: ");\r
- Timer t = new Timer();\r
- HashSet<int> good \r
- = MakeRandom(count, new GoodIntegerEqualityComparer());\r
- Console.WriteLine("({0} sec, {1} items)", t.Check(), good.Count);\r
- ISortedDictionary<int,int> bcd = good.BucketCostDistribution();\r
- foreach (KeyValuePair<int,int> entry in bcd) \r
- Console.WriteLine("{0,7} bucket(s) with cost {1,5}", \r
- entry.Value, entry.Key);\r
- }\r
- {\r
- Console.Write("Bad hash function: ");\r
- Timer t = new Timer();\r
- HashSet<int> bad = MakeRandom(count, new BadIntegerEqualityComparer());\r
- Console.WriteLine("({0} sec, {1} items)", t.Check(), bad.Count);\r
- ISortedDictionary<int,int> bcd = bad.BucketCostDistribution();\r
- foreach (KeyValuePair<int,int> entry in bcd) \r
- Console.WriteLine("{0,7} bucket(s) with cost {1,5}", \r
- entry.Value, entry.Key);\r
- }\r
- }\r
-\r
- private static readonly C5Random rnd = new C5Random();\r
- \r
- public static HashSet<int> MakeRandom(int count, \r
- SCG.IEqualityComparer<int> eqc) {\r
- HashSet<int> res;\r
- if (eqc == null) \r
- res = new HashSet<int>();\r
- else\r
- res = new HashSet<int>(eqc);\r
- for (int i=0; i<count; i++)\r
- res.Add(rnd.Next(1000000)); \r
- return res;\r
- }\r
-\r
- private class BadIntegerEqualityComparer : SCG.IEqualityComparer<int> {\r
- public bool Equals(int i1, int i2) {\r
- return i1 == i2;\r
- }\r
- public int GetHashCode(int i) {\r
- return i % 7;\r
- }\r
- }\r
-\r
- private class GoodIntegerEqualityComparer : SCG.IEqualityComparer<int> {\r
- public bool Equals(int i1, int i2) {\r
- return i1 == i2;\r
- }\r
- public int GetHashCode(int i) {\r
- return i;\r
- }\r
- }\r
- }\r
-\r
- // Crude timing utility\r
- \r
- public class Timer {\r
- private DateTime start;\r
- \r
- public Timer() {\r
- start = DateTime.Now;\r
- }\r
- \r
- public double Check() {\r
- TimeSpan dur = DateTime.Now - start;\r
- return dur.TotalSeconds;\r
- }\r
- }\r
-}\r
-\r
+/*
+ Copyright (c) 2003-2006 Niels Kokholm and Peter Sestoft
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+*/
+
+// C5 example: hash codes, good and bad 2005-02-28
+
+// Compile with
+// csc /r:C5.dll HashCodes.cs
+
+using System;
+using C5;
+using SCG = System.Collections.Generic;
+
+namespace MyHashCodesTest {
+ class MyTest {
+ public static void Main(String[] args) {
+ int count = int.Parse(args[0]);
+ {
+ Console.Write("Good hash function: ");
+ Timer t = new Timer();
+ HashSet<int> good
+ = MakeRandom(count, new GoodIntegerEqualityComparer());
+ Console.WriteLine("({0} sec, {1} items)", t.Check(), good.Count);
+ ISortedDictionary<int,int> bcd = good.BucketCostDistribution();
+ foreach (KeyValuePair<int,int> entry in bcd)
+ Console.WriteLine("{0,7} bucket(s) with cost {1,5}",
+ entry.Value, entry.Key);
+ }
+ {
+ Console.Write("Bad hash function: ");
+ Timer t = new Timer();
+ HashSet<int> bad = MakeRandom(count, new BadIntegerEqualityComparer());
+ Console.WriteLine("({0} sec, {1} items)", t.Check(), bad.Count);
+ ISortedDictionary<int,int> bcd = bad.BucketCostDistribution();
+ foreach (KeyValuePair<int,int> entry in bcd)
+ Console.WriteLine("{0,7} bucket(s) with cost {1,5}",
+ entry.Value, entry.Key);
+ }
+ }
+
+ private static readonly C5Random rnd = new C5Random();
+
+ public static HashSet<int> MakeRandom(int count,
+ SCG.IEqualityComparer<int> eqc) {
+ HashSet<int> res;
+ if (eqc == null)
+ res = new HashSet<int>();
+ else
+ res = new HashSet<int>(eqc);
+ for (int i=0; i<count; i++)
+ res.Add(rnd.Next(1000000));
+ return res;
+ }
+
+ private class BadIntegerEqualityComparer : SCG.IEqualityComparer<int> {
+ public bool Equals(int i1, int i2) {
+ return i1 == i2;
+ }
+ public int GetHashCode(int i) {
+ return i % 7;
+ }
+ }
+
+ private class GoodIntegerEqualityComparer : SCG.IEqualityComparer<int> {
+ public bool Equals(int i1, int i2) {
+ return i1 == i2;
+ }
+ public int GetHashCode(int i) {
+ return i;
+ }
+ }
+ }
+
+ // Crude timing utility
+
+ public class Timer {
+ private DateTime start;
+
+ public Timer() {
+ start = DateTime.Now;
+ }
+
+ public double Check() {
+ TimeSpan dur = DateTime.Now - start;
+ return dur.TotalSeconds;
+ }
+ }
+}
+
projects / mono.git / blobdiff