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// Some interfaces, one is a superset of the other
public interface Node
{
int GetStat();
}
public interface FileNode : Node
{
int NotUsed();
}
// Some basic implementations, one is a superset of the other
public class GenericNode : Node
{
public virtual int GetStat() { return 0; }
}
public class GenericFileNode : GenericNode , FileNode
{
public virtual int NotUsed() { return -1; }
}
// Now the ability to override a method depends on if we specify again that we
// implement an interface -- although we must because we derive from a class
// that does.
public class WorkingTest : GenericFileNode , FileNode
{
public override int GetStat() { return 42; }
}
public class FailingTest : GenericFileNode
{
// This never gets called, but it builds, so what did we override?!!!
public override int GetStat() { return 42; }
}
public class TestWrapper
{
static bool Test(Node inst, string name)
{
if(inst.GetStat() == 42)
{
System.Console.WriteLine("{0} -- Passed", name);
return true;
} else
{
System.Console.WriteLine("{0} -- FAILED", name);
return false;
}
}
public static int Main()
{
if( Test(new WorkingTest(), "WorkingTest")
&& Test(new FailingTest(), "FailingTest") )
return 0; // everything worked
else
return 1;
}
}
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