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using System;
public static class Driver
{
delegate void SimpleDelegate ();
static int error = 0;
class VirtualDelegate0
{
public virtual void OnEvent ()
{
Console.WriteLine ("VirtualDelegate0.OnEvent (error!)");
error = 1;
}
}
class VirtualDelegate1 : VirtualDelegate0
{
public override void OnEvent ()
{
Console.WriteLine ("VirtualDelegate1.OnEvent");
}
}
class NonVirtualDelegate
{
public void OnEvent ()
{
Console.WriteLine ("NonVirtualDelegate.OnEvent");
}
}
static bool check (SimpleDelegate d)
{
error = 0;
d ();
return error == 0;
}
public static int Main ()
{
SimpleDelegate dv = new SimpleDelegate (new VirtualDelegate1 ().OnEvent);
SimpleDelegate dnv = new SimpleDelegate (new NonVirtualDelegate ().OnEvent);
if (!check (dv + dv))
return 1;
if (!check (dnv + dv))
return 2;
if (!check (dv + dnv))
return 3;
if (!check (dnv + dnv))
return 4;
return 0;
}
}
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