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Accessing generics from inherited type


Accessing generics from inherited type

By : Ali
Date : October 18 2020, 06:10 PM
Any of those help Your definition of Bar is incorrect. It should look something like this:
code :
import Foo from './Foo';
export default abstract class Bar<K, V, F extends Foo<K,V>> {}


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Java Generics: Accessing Generic Type at runtime

Java Generics: Accessing Generic Type at runtime


By : batman
Date : March 29 2020, 07:55 AM
will be helpful for those in need It is true that generics aren't generally known at runtime in Java, because they are implemented with Type Erasure.
Reflecting Generics?
Polymorphism in generics - compile error when passing inherited object (Cannot implicitly convert type)

Polymorphism in generics - compile error when passing inherited object (Cannot implicitly convert type)


By : Suganthy Sathiyanara
Date : March 29 2020, 07:55 AM
wish helps you I think you have too many layers of generics and it's getting confusing. The actual answer is at the bottom, but first a digression to explain the problem...
You're correct that WorkerServiceConfiguration inherits from ICoordinationExecutionService. That's why this code does work:
code :
protected ICoordinationExecutionService<CollectionTask> Test()
{
    return new WorkerServiceConfiguration();
}
public interface ITaskScheduleAlgorithm<TType>
{
}

public class SimpleTaskScheduleAlgorithm<TType> : ITaskScheduleAlgorithm<TType>
{
}

public ITaskScheduleAlgorithm<object> GetAlgorithm()
{
    return new SimpleTaskScheduleAlgorithm<string>();
}
public interface ITaskScheduleAlgorithm<TType, out TType2>
{
}
Why custom type attributes not inherited in generics?

Why custom type attributes not inherited in generics?


By : shawn patrick
Date : March 29 2020, 07:55 AM
this will help Your attribute is inherited by your child class. The problem you encounter is not specific to generics. It can easily be reproduced with non-generic types:
code :
using System.Linq;

[AttributeUsage(AttributeTargets.Class)]
public class FooAttribute : Attribute
{
    private readonly string name;

    public FooAttribute(string name)
    {
        this.name = name;
    }
}

[Foo("bar")]
public class Base { }
public class Child : Base { }

Console.WriteLine(typeof(Base).CustomAttributes.Count());  // Prints 1.
Console.WriteLine(typeof(Child).CustomAttributes.Count()); // Prints 0.
typeof(ImplClass).GetCustomAttributes(typeof(CacheAttribute), inherit: true)
C# array of base class containing inherited classes, accessing non-inherited fields

C# array of base class containing inherited classes, accessing non-inherited fields


By : user2184577
Date : March 29 2020, 07:55 AM
wish helps you Make Tree and Bush and other subclasses that has a Fruit property implement IHasFruit, which looks like this:
code :
interface IHasFruit {
    // I assume "Fruit" properties are of type "Fruit"?
    // Change the type to whatever type you use
    Fruit Fruit { get; }
}

class Tree : Detail, IHasFruit {
    ...
}

class Bush : Detail, IHasFruit {
    ...
}
public Fruit GetFruit(int index) {
    Detail detail = details[index];
    return (detail as IHasFruit)?.Fruit; // this will return null if the detail has no fruit.
}
Declaring inherited generics with complex type constraints

Declaring inherited generics with complex type constraints


By : Rohit J
Date : March 29 2020, 07:55 AM
seems to work fine What is VehicleFactory going to do with T? Does it actually need the constraint in order to work, or is it just for the sake of developer sanity checking?
One common way round this is to declare a non-generic interface (IDriveable) and then make your generic one extend that:
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