Created
September 29, 2008 21:08
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using System; | |
using System.Collections.Generic; | |
static class ArrayExtensions { | |
public static void StableSort<T>(this T[] values, Comparison<T> comparison) { | |
var pairs = new KeyValuePair<int, T>[values.Length]; | |
for (var i = 0; i < values.Length; i++) | |
pairs[i] = new KeyValuePair<int, T>(i, values[i]); | |
Array.Sort(pairs, values, new StabilizingComparer<T>(comparison)); | |
} | |
private sealed class StabilizingComparer<T> : IComparer<KeyValuePair<int, T>> | |
{ | |
private readonly Comparison<T> _comparison; | |
public StabilizingComparer(Comparison<T> comparison) { | |
_comparison = comparison; | |
} | |
public int Compare(KeyValuePair<int, T> x, | |
KeyValuePair<int, T> y) { | |
var result = _comparison(x.Value, y.Value); | |
return result != 0 ? result : x.Key.CompareTo(y.Key); | |
} | |
} | |
} | |
sealed class Person | |
{ | |
public int BirthYear { get; set; } | |
public string Name { get; set; } | |
public override string ToString() { | |
return string.Format( | |
"{{ BirthYear = {0}, Name = {1} }}", | |
BirthYear, Name); | |
} | |
} | |
static class Program | |
{ | |
static void Main() | |
{ | |
var unsorted = new[] { | |
new Person { BirthYear = 1948, Name = "Cat Stevens" }, | |
new Person { BirthYear = 1955, Name = "Kevin Costner" }, | |
new Person { BirthYear = 1952, Name = "Vladimir Putin" }, | |
new Person { BirthYear = 1955, Name = "Bill Gates" }, | |
new Person { BirthYear = 1948, Name = "Kathy Bates" }, | |
new Person { BirthYear = 1956, Name = "David Copperfield" }, | |
new Person { BirthYear = 1948, Name = "Jean Reno" }, | |
}; | |
Array.ForEach(unsorted, Console.WriteLine); | |
Console.WriteLine(); | |
var unstable = (Person[]) unsorted.Clone(); | |
Array.Sort(unstable, (x, y) => x.BirthYear.CompareTo(y.BirthYear)); | |
Array.ForEach(unstable, Console.WriteLine); | |
Console.WriteLine(); | |
var stable = (Person[]) unsorted.Clone(); | |
stable.StableSort((x, y) => x.BirthYear.CompareTo(y.BirthYear)); | |
Array.ForEach(stable, Console.WriteLine); | |
} | |
} |
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