User loginNavigation 
(newbie question) Covariance and contravarianceFirstly I don't have any theoretical background in Category Theory. My goal is just trying to understand the following: On wikipedia, A covariant type operator in a type system preserves the ordering â‰¤ of types. A contravariant operator reverses â‰¤. If neither of these apply, the operator is invariant. These terms come from category theory. What is type operator referring to in the context say Java ? The array type is usually covariant on the base type. Would I be right to say that the type operator is the assignment operator ? String[] a = new String[1]; Object[] b = a; Thanks. By chihiro at 20080107 03:16  LtU Forum  previous forum topic  next forum topic  other blogs  7672 reads

Browse archivesActive forum topics 
Recent comments
8 min 6 sec ago
11 min 57 sec ago
22 min 36 sec ago
2 hours 1 min ago
21 hours 15 min ago
21 hours 44 min ago
23 hours 46 min ago
1 day 3 hours ago
1 day 10 hours ago
1 day 11 hours ago