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akaJB

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CC#

•Created by akaJB on 7/30/2023 in #help

✅ Confusion over defining a default implementation on an interface

Thank you for the long reply. That all makes sense and clears up my confusion.

6 replies

CC#

•Created by akaJB on 7/29/2023 in #help

✅ How do I deal with generic covariance and collections types?

Can you verify if I'm I misunderstanding something? It seems to not compile:

using System.Collections.Generic;

namespace Test
{
    public interface IBox
    {
    }

    public interface IBoxCollection<out T>
        where T : IBox
    {
        IReadOnlyDictionary<string, T> Collection { get; }
    }
}

using System.Collections.Generic;

namespace Test
{
    public interface IBox
    {
    }

    public interface IBoxCollection<out T>
        where T : IBox
    {
        IReadOnlyDictionary<string, T> Collection { get; }
    }
}

https://dotnetfiddle.net/v9UvPa

8 replies

CC#

•Created by akaJB on 7/28/2023 in #help

❔ Attempting to create a Result<T, E> type, running into issues with subclasses

In my defense it's late, but I'm having a hard time understanding how to implement a result type via contravariant/covariance. Would you have a real world example of these concepts in practice? Fwiw I plan on looking at it in the morning with fresh eyes

9 replies

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