covariance
Implementing Co and Contra variance generic interface & its practical uses
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[详细]
2023-02-13 04:19 分类：问答Covariant virtual functions return type problem
I have following code: #include <iostream> using namespace std; class Child1 { int i; }; class Child2 : public Child1[详细]
2023-02-12 07:11 分类：问答Why does this inheritance hierarchy not permit this assignment?
I have the following complex inheritance hierarchy: I1<I3> A1 : C1, I2 C2 : A1, I3 C3 : A2<C2>, I4[详细]
2023-02-10 05:54 分类：问答Casting List<T> - covariance/contravariance problem
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[详细]
2023-02-09 09:36 分类：问答How to implement template class covariance in C++?
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[详细]
2023-02-09 06:23 分类：问答Can I implement an interface that contains a property that is of child type to what is required by the interface?
I am receiving the following error: ClassName.PropertyName cannot implementIClassType.PropertyName because it does not have the matching return type of IBasePropertyType[详细]
2023-02-08 03:48 分类：问答Container covariance in C++
I know that C++ doesn\'t support covariance for containers elements, as in Java or C#. So the following code probably is undef开发者_如何学JAVAined behavior:[详细]
2023-02-06 17:26 分类：问答Simple examples of co and contravariance
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).[详细]
2023-02-03 16:22 分类：问答How is covariance cooler than polymorphism...and not redundant?
.NET 4 introduces covariance.I guess it is useful.After all, MS went through all the trouble of adding it to the C# language.But, why is Covariance more useful than good old polymorphism?[详细]
2023-02-03 01:09 分类：问答Covariance and Contravariance on the same type argument
The C# spec states that an argument type cannot be both covariant and contravariant at the same time.[详细]
2023-02-01 17:13 分类：问答
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