Demonstrate a generic interface

using System;

public interface ISequence {
T getNext();
void reset();
void setStart(T v);
}

class ByTwos : ISequence {
T start;
T val;

public delegate T IncByTwo(T v);

IncByTwo incr;

public ByTwos(IncByTwo incrMeth) {
start = default(T);
val = default(T);
incr = incrMeth;
}

public T getNext() {
val = incr(val);
return val;
}

public void reset() {
val = start;
}

public void setStart(T v) {
start = v;
val = start;
}
}

class GenIntfDemo {
static int intPlusTwo(int v) {
return v + 2;
}

static double doublePlusTwo(double v) {
return v + 2.0;
}

public static void Main() {
ByTwos intBT = new ByTwos(intPlusTwo);

for(int i=0; i < 5; i++) Console.Write(intBT.getNext() + " "); Console.WriteLine(); ByTwos dblBT = new ByTwos(doublePlusTwo);

dblBT.setStart(11.4);

for(int i=0; i < 5; i++) Console.Write(dblBT.getNext() + " "); } } [/csharp]