contravariance

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ref and out parameters in C# and cannot be marked as variant

What does the statement mean? From here ref and out parameters in C# and cannot be marked as variant. 1) Does it mean that the following can not be done.[详细]

2022-12-31 05:51 分类：问答
In C#, are event handler arguments contravariant?

If I have a class that raises an event, with (e.g.) FrobbingEventArgs, am I allowed to handle it with a method that takes EventArgs?[详细]

2022-12-30 20:26 分类：问答
Detect variance on generic type parameters of interfaces

Is there a way to refl开发者_Python百科ect on an interface to detect variance on its generic type parameters and return types? In other words, can I use reflection to differentiate between the two int[详细]

2022-12-30 19:10 分类：问答
Covariance and Contravariance inference in C# 4.0

When we define our interfaces in C# 4.0, we are allowed to mark each of the generic parameters as in or out. If we try to set a generic parameter as out and that\'d lead to a problem, the compiler rai[详细]

2022-12-28 18:12 分类：问答
Can't contravariance be implemented with interfaces?

I\'m at the point where I\'m starting to grasp contravariance, although I\'m trying to work out what the advantage is when an interface can be used instead. Obviously I\'m missing something.[详细]

2022-12-28 01:57 分类：问答
Does C# 4's covariance support nesting of generics?

I don\'t understand why \'x\' below converts, but \'y\' and \'z\' do not. var li开发者_如何学Pythonst = new List<List<int>>();[详细]

2022-12-27 21:30 分类：问答
Generics : List<? extends Animal> is same as List<Animal>?

I am just trying to understand the 开发者_JAVA技巧extends keyword in Java Generics. List<? extends Animal> means we can stuff any object in the List which IS A Animal[详细]

2022-12-25 09:11 分类：问答
Why does C# (4.0) not allow co- and contravariance in generic class types?

What is the real reason for that limitation? Is it just work that had to be done? Is it conceptually hard? Is it impossible?[详细]

2022-12-24 08:12 分类：问答
Give examples of functions which demonstrate covariance and contravariance in the cases of both overloading and overriding in Java? [closed]

Closed. This question needs to be more focused. It is not currently accepting answers. 开发者_Go百科[详细]

2022-12-24 02:09 分类：问答
Why the concept of "Covariance" and "Contravariance" are applicable while implementing the methods of an interface?

The use case is some what like this: public class SomeClass : ICloneable { // S开发者_JS百科ome Code[详细]

2022-12-23 17:42 分类：问答