query: Why are covariance and contravariance supported only for interfaces but not classes?
positive_passages.docid: 144504
positive_passages.text: Why isn't there generic variance for classes in C# 4.0?
negative_passages.docid: 81041
negative_passages.text: Why an abstract class implementing an interface can miss the declaration/implementation of one of the interface's methods?
negative_passages.docid: 139848
negative_passages.text: Why is multiple inheritance not supported in most of programming language?
negative_passages.docid: 16816
negative_passages.text: Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
negative_passages.docid: 43837
negative_passages.text: Implementing interface properties in interfaces with a setter?
negative_passages.docid: 92138
negative_passages.text: Is the C# "explicit implementation" of the interface present in Java?
negative_passages.docid: 80633
negative_passages.text: Java - declaring from Interface type instead of Class
negative_passages.docid: 32435
negative_passages.text: Why can't overriding methods throw exceptions broader than the overridden method?
negative_passages.docid: 62282
negative_passages.text: How do the Proxy, Decorator, Adapter, and Bridge Patterns differ?
negative_passages.docid: 143499
negative_passages.text: Why is it not possible to overload class templates?
negative_passages.docid: 848
negative_passages.text: Why can't I define a static method in a Java interface?
negative_passages.docid: 72662
negative_passages.text: Why does a generic type constraint result in a no implicit reference conversion error?
negative_passages.docid: 146553
negative_passages.text: Why an interface can not implement another interface?
negative_passages.docid: 6853
negative_passages.text: Interface vs Abstract Class (general OO)
negative_passages.docid: 57860
negative_passages.text: Can we create an object of an interface?
negative_passages.docid: 57999
negative_passages.text: How is Generic Covariance & Contra-variance Implemented in C# 4.0?
negative_passages.docid: 114977
negative_passages.text: Why doesn't 'ref' and 'out' support polymorphism?