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