public static void ExampleCode()
{
Func <int, bool> func = IsEven;
var funcWithCache = func.A();
bool isEven;
isEven = funcWithCache.Invoke(4); // new input value, new result
isEven = funcWithCache.Invoke(3); // new input value, new result
isEven = funcWithCache.Invoke(4); // previously used value, cached result
}
