Questions tagged [generics]

Question 1

Due to type erasure, I can't do instanceof T in Java. With that in mind, how do (should) I write, for example, a generic TreeNode (or, more precisely, DefaultMutableTreeNode)? setUserObject() accepts ...

Question 2

There is a blog post by Eric Lippert where he describes how to define variance. In a general sense, covariance is achieved when the direction of assignment compatibility is preserved. Contravariance ...

Question 3

I have a class where I want to chain certain operations. The class look something like this class MyClass<T> { create<X>(fn: (_: T) => X): MyClass<X> { ... ...

Question 4

Refer to the highest upvoted answer here for why you should make an IPizza interface with a IPizza.Prepare() method. This is highly upvoted, But I think the answer is flawed. Sure a pizza can be ...

Question 5

I'm trying to create an interaction system for a game I'm developing with Unity and C# and I've been struggling with it for a while now. It consists of interactors and interactables. The idea is that ...

Question 6

I've recently found myself using a generics with constraint that a type should inherit from a specific base class, but now I've just realised that this is redundant and unnecessary because the ...

Question 7

I'm currently designing an interface for a container that is supposed to store references of different instances that derived from a common supertype. An analogy of it would be as following: Suppose ...

Question 8

I currently working on a parser project in C# and have run into problem. I have an entity folder within my project and within it I have: Entity IEntity.cs (defines a contract for entity classes) ...

Question 9

Abstract The case: Application contains a lot of views with a list of data. Data views (lists of records) have pagination, filtering and sorting options. The user must be able to select a "...

Question 10

I've written a class that synchronizes a table between two databases using Dapper. The public and private Methods in the class are generic and the generic parameter is the POCO class that is being ...

Question 11

I have 2 classes that share some properties public class SportsUser { public string errorCode { get; set; } //the sportsuser and SportsAdminUser is from a different database hence the long and ...

Question 12

I wrote this valid piece code, which made me wonder if there was a name for it: public class GenericObject<T> { public T Obj { get; set; } } public class DerivedClass: GenericObject<...

Question 13

YAGNI might tell us, that in the below implementation the generic version is not needed, as long as the function is only used once. But to me personally, it seems, the generic version is more readable ...

Question 14

Here is a concrete example of what I'm asking about: MutableList[ImmutableList[Object]] Where ImmutableList is covariant wrt its first parameter, but MutableList is invariant wrt its first parameter. ...

Question 15

I can easily put together a message handling set of generic apis in C# with the following quick and dirty code: void Main() { var messageClient = new MessageClient(new TestMessageHandler(), new ...

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Questions tagged [generics]

Ensuring type safety, honoring supertype contract

What is the relationship between variance, generic interfaces, and input/output?

Changing the generic type when chaining operations

Are interfaces made useless by the template pattern?

Circular references with generic classes

Is inheritance constraint on Generics redundant? If not what is its recommended use?

Interface design for container that holds different instances derived from a common type

C# how to implement a factory class which doesn't require an argument passed to indicate objects type?

C# is it acceptable to create a generic class and use an enum as generic type?

Alternative To Generic Methods where Type is known at runtime

c# class structuring and appropriate coding techniques

Is there a name for this construct with generics?

Should one prefer a generic version of a function, even if it's not re-used (yet)?

How do covariant parameterized types nested inside invariant parameterized types act?

Simple Message Handler in Java with generics

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