c# Programming Glossary: covariant

Why covariance and contravariance do not support value type

http://stackoverflow.com/questions/12454794/why-covariance-and-contravariance-do-not-support-value-type

although the two are linked. In particular This is why covariant and contravariant conversions of interface and delegate types..

C# variance problem: Assigning List<Derived> as List<Base>

http://stackoverflow.com/questions/2033912/c-sharp-variance-problem-assigning-listderived-as-listbase

stringFactory Safe allowed in C# 4 Func out T is covariant in T because T is only used in an output position. Compare that.. objectAction Safe allowed in C# 4 IEnumerable out T is covariant as well making this correct in C# 4 as pointed out by others..

Difference between Covariance & Contra-variance

http://stackoverflow.com/questions/2184551/difference-between-covariance-contra-variance

IE X IE Y . A mapping which has this property is called a covariant mapping . Now consider the set IComparable Tiger IComparable..

Why isn't there generic variance for classes in C# 4.0?

http://stackoverflow.com/questions/2733346/why-isnt-there-generic-variance-for-classes-in-c-sharp-4-0

this question Suppose you had a class C T that was covariant in T. What might its implementation look like T has to be out.. Pretty much the only useful thing you could build with a covariant class is something immutable as far as T is concerned. Now I.. as T is concerned. Now I think it would be awesome to have covariant immutable lists and stacks and whatnot that were class types...

Question about C# covariance

http://stackoverflow.com/questions/4034495/question-about-c-sharp-covariance

share improve this question Simply put IList T is not covariant whereas IEnumerable T is. Here's why... Suppose IList T was.. IEnumerable T is. Here's why... Suppose IList T was covariant. The code below is clearly not type safe... but where would..

c# covariant return types utilizing generics

http://stackoverflow.com/questions/4348760/c-sharp-covariant-return-types-utilizing-generics

covariant return types utilizing generics Is the code below the only.. generics Is the code below the only way to implement covariant return types public abstract class BaseApplication T public.. correct to pose the question as they did. Recall that a covariant mapping is a mapping which preserves the existence and direction..

Covariance and IList

http://stackoverflow.com/questions/5832094/covariance-and-ilist

of a collection that supports index lookups that is also covariant I would like to not create my own. Thanks Brian c# .net .net.. covariance share improve this question It can only be covariant if it only has a get indexer i.e. public T this int index get.. but you could wrap it i.e. write an extension method var covariant list.AsCovariant which is a wrapper around an IList T that only..