57 lines
1.6 KiB
C#
57 lines
1.6 KiB
C#
//-- ex-gen-type-parameter-in-constraint
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using System;
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using System.Collections.Generic;
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// A constraint may involve type parameters
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// A type may have multiple constraints
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struct ComparablePair<T,U> : IComparable<ComparablePair<T,U>>
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where T : IComparable<T>
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where U : IComparable<U> {
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public readonly T Fst;
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public readonly U Snd;
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public ComparablePair(T fst, U snd) {
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Fst = fst; Snd = snd;
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}
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// Lexicographic ordering
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public int CompareTo(ComparablePair<T,U> that) {
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int firstCmp = this.Fst.CompareTo(that.Fst);
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return firstCmp != 0 ? firstCmp : this.Snd.CompareTo(that.Snd);
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}
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public bool Equals(ComparablePair<T,U> that) {
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return this.Fst.Equals(that.Fst) && this.Snd.Equals(that.Snd);
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}
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public override String ToString() {
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return "(" + Fst + ", " + Snd + ")";
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}
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}
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// Sorting soccer world champions by country and year
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class MyTest {
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static void Test ()
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{
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new ComparablePair<string,int>("Brazil", 2002);
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}
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public static void Main(string[] args) {
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List<ComparablePair<string,int>> lst
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= new List<ComparablePair<string,int>>();
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lst.Add(new ComparablePair<String,int>("Brazil", 2002));
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lst.Add(new ComparablePair<String,int>("Italy", 1982));
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lst.Add(new ComparablePair<String,int>("Argentina", 1978 ));
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lst.Add(new ComparablePair<String,int>("Argentina", 1986 ));
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lst.Add(new ComparablePair<String,int>("Germany", 1990));
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lst.Add(new ComparablePair<String,int>("Brazil", 1994));
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lst.Add(new ComparablePair<String,int>("France", 1998));
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// lst.Sort();
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foreach (ComparablePair<String,int> pair in lst)
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Console.WriteLine(pair);
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}
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}
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