covariance

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Covariance not working with generic dictionary entry

Given the class below: public class ConcreteEmployeeRoleCreator<T, TConcrete, TSpec> where TConcrete : class, T, new()[详细]

2023-03-19 01:00 分类：问答
How to combine 2different IQueryable/List/Collection with same base class? LINQ Union and Covariance issues

I am trying to combine (union or concat) two lists/collection into one. The two lists have a common base class. e.g. I\'ve tried this:[详细]

2023-03-18 14:34 分类：问答
Casting question in C#

I have a interface that inherits from IList: public interface IBase {} public class Derived : IBase {} public interface IMyList : IList<IBase> {}[详细]

2023-03-17 19:37 分类：问答
objective-c++: is it possible to define a c++ class with a method which returns objective-c classes and uses covariant returns?

**Edit: this only happens with llvm; gcc supports this just fine. Consider the following. Objective-c classes A and B.[详细]

2023-03-17 13:47 分类：问答
C# 3.5 Covariance issue?

I\'ve been hearing/reading a lot about covariance issues in C# and I wanted to pose a few questions & scenarios so hopefully I can clear up my confusion on the matter.[详细]

2023-03-17 01:42 分类：问答
Compute Covariance Matrix in Java

I want to calculate covari开发者_C百科ance matrix using Java. Is there any free library to compute covariance Matrix in Java?Here is a short example, how you can create it with Apache Commons Math (3[详细]

2023-03-14 04:49 分类：问答
Parent-Child Data Structure without an Explicit Leaf Node Class using Generics

I have the following example relationship: namespace Yesod { public class Program { // // // public struct Particle[详细]

2023-03-12 07:00 分类：问答
interface covariance issue

The following code sample: interface I<out T> where T : class, I<T> { T GetT(); } interface J : I<J>[详细]

2023-03-10 22:06 分类：问答
Java Type Casting Problem [duplicate]

This question already has answers here: Closed 11 years ago. Possible Duplicates: How to Cast a Vector<ObjectA&g开发者_JAVA百科t; to Vector<ObjectB> in Java?[详细]

2023-03-08 20:46 分类：问答
Covariance/Contravariance Conundrum when using generic interface constraints

public interface IShape{} public class Rectangle : IShape{} public class Base{} public class Derived : Base{}[详细]

2023-03-08 18:44 分类：问答