Mega Code Archive
A simple demonstration of a base class constraint
<![CDATA[
Because of the base class constraint, all type arguments passed to Test must have A as a base class.
using System;
class A {
public void hello() {
Console.WriteLine("Hello");
}
}
class B : A { }
class C { }
class Test<T> where T : A {
T obj;
public Test(T o) {
obj = o;
}
public void sayHello() {
obj.hello();
}
}
class MainClass {
public static void Main() {
A a = new A();
B b = new B();
C c = new C();
Test<A> t1 = new Test<A>(a);
t1.sayHello();
Test<B> t2 = new Test<B>(b);
t2.sayHello();
// The following is invalid because
// C does not inherit A.
// Test<C> t3 = new Test<C>(c); // Error!
}
}
Hello
Hello
]]>