covariance

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Generic method with variance in C#?

Consider following classes (inheritance tree): public class A {} public class B: A {} And this method: public IList<A> MyMethod(){[详细]

2023-02-28 23:54 分类：问答
Why isn't .NET 4.0 covariance working in this example?

I\'m getting compiler errors on these lines: RenderLookup(Cars); RenderLookup(Employees); Error2Argument 1: cannot convert from \'Demo.MyList<Demo.Car>\' to \'System.Collections.Generic.IEnum[详细]

2023-02-24 04:20 分类：问答
C# .NET 4.0 generic covariance problem with cast exception

I have been battling with this for a while, so any help would be appreciated. Here\'s the scenario i am faced with on C# .NET 4.0.[详细]

2023-02-23 03:13 分类：问答
Breaking change in .NET 4.0 with method overloading and covariance

after migrating from .NET 3.5 to 4.0 i have a strange problem with a function resulting in stack overflow on 4.0 while working perfectly on the 3.5 framework. I reproduced the problem with the followi[详细]

2023-02-22 17:27 分类：问答
Subclasses and return types

let\'s say I wanted to have something like the following: abstract class PDF[T, S <: PDF[T, _]] { def fit(obs: Seq[T], weights: Seq[Double]): S[详细]

2023-02-19 08:25 分类：问答
Type Members and Covariance

I guess, \"type variance annotations\" (+ and -) cannot be applied to \"type members\". In order to explain it to myself I considered the following example[详细]

2023-02-17 11:25 分类：问答
Fill lower matrix with vector by row, not column

I am trying to read in a variance-covariance matrix written out by LISREL in the following format in a plain text, whitespace separated file:[详细]

2023-02-17 05:30 分类：问答
How to determine type parameter's variance?

Inspired by Real-world examples of co- and contravariance in Scala I thought a better question would be:[详细]

2023-02-16 20:47 分类：问答
What is the correct way to specify type variance for methods in a companion object

For me one of the more confusing aspects of the Scala type system is understanding covariance, contravariance, type bounds etc.[详细]

2023-02-16 07:47 分类：问答
Downcasting Lists [duplicate]

This question already has answers here: Closed 11 years ago. Possible Du开发者_运维知识库plicate:[详细]

2023-02-14 06:31 分类：问答