/// <summary>
/// True if the scorable is non-null, false otherwise.
/// </summary>
public static bool Keep <Item, Score>(IScorable <Item, Score> scorable)
{
// complicated because IScorable<Item, Score> is variant on generic parameter,
// so generic type arguments of NullScorable<,> may not match generic type
// arguments of IScorable<,>
var type = scorable.GetType();
if (type.IsGenericType)
{
var definition = type.GetGenericTypeDefinition();
if (typeof(NullScorable <,>).IsAssignableFrom(definition))
{
return(false);
}
}
return(true);
}
