How and why does \'val\' and \'case\' affect the type system? (Especially the variance) Welcome to Scala version 2.8.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_22).
I am trying to understand the possible use of using a variant generic interface(using both co and contra variant). Can someone please explain? I understood co and contra variance examples for interfac
Given the following types: public interface IMyClass { } public class MyClass : IMyClass { } I wonder how can I convert a List<MyClass> to a List<IMyClass>? I am not completely clear on
Is it possible to implement a class template in such a way that one object could be casted to another if their template arguments are related? Here is an exaple to show the idea (of course it will not
I am receiving the following error: ClassName.PropertyName cannot implementIClassType.PropertyName because it does not have the matching return type of IBasePropertyType
Could someone provide me simple C# examples of convariance, contravariance, invariance and contra-invariance (if such thing exi开发者_运维问答sts).
The C# spec states that an argument type cannot be both covariant and contravariant at the same time.
This snippet is not compiled in LINQPad. void Main() { (new[]{0,1,2,3}).Where(IsNull).Dump(); } static bool IsNull(object arg) { return arg == null; }
I would like to map the elements of a Scala tuple (or triple, ...) using a single function returning type R.The result should be a tuple (or triple, ...) with elements of type R.
It appears that in C# 4.0, variance specifiers are only applicable to interface types. So let\'s say I have ViewModel / EditModel classes and a simple hierarc开发者_运维技巧hy of models.
加载中,请稍侯......