Questions tagged [generics]
Generics are a form of parametric polymorphism found in a range of languages, including .NET languages, Java, Swift, Rust and Go (since 1.18).
generics
49,948
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Can not create Function array in Java 8
I have a class called SFunction which extends from Function in JDK 8
@FunctionalInterface
public interface SFunction<T, R> extends Function<T, R>, Serializable {
}
Now I have several ...
- 13.5k
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21
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check if given object implements certain generic interface; type argument(s) NOT known [duplicate]
I have some object. I want to check at runtime if it is an IReadOnlyCollection<T> of any T, i.e. I cannot specify that T in my check. So it should return true for e.g. IReadOnlyCollection<...
- 2,792
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votes
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48
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Java Generic wildcard misunderstanding [duplicate]
Having this:
public <T extends DataAgent> DataProcessor<? extends DataAgent> resolveProcessor(
final String response, T dAgent) throws Exception {
if (dAgent.getType() ...
- 396
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1
answer
62
views
Is it possible to mask a reference with an interface without heap allocating?
Having the following two classes
interface IMask
{
string GetName();
}
readonly struct StructSource : IMask
{
string IMask.GetName()
{
throw new NotImplementedException();
}
}
...
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answers
56
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How to simulate non-type template parameters in C# for generic classes for compile time type safety?
Is there a way to treat integers eg. 3 and 5 as their own types with an additional property being the value they represent? Specifically I want Modulo<3> to be different to Modulo<5> to ...
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0
answers
14
views
How do you transform a typescript object to another type, without using type casting? [duplicate]
I have a mapped type that maps strings/numbers/booleans to "tagged" versions of those types:
interface TaggedString {
type: "string";
value: string;
}
interface TaggedNumber {
...
- 43
0
votes
0
answers
26
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Type 'any Shape' cannot conform to 'Shape'
I am trying to create different shapes on a card based on the card type in Swiftui.
import SwiftUI
let shapes: [any Shape] = [Circle(), Rectangle(), Ellipse()]
struct CardView: View {
var body: ...
- 4,939
1
vote
1
answer
51
views
Creating generics with delegate protocol type
I am trying to refactor this code:
@objc protocol BaseDelegate {
func xxx()
}
protocol DerivedDelegate: BaseDelegate {
func yyy()
}
protocol NextDerivedDelegate: BaseDelegate {
func zzz()...
0
votes
0
answers
43
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SwiftUI store variety of generic functions for custom Table [closed]
Hello im still in my beginning of learning SwiftUI.
Currently I try to build a expense tracker myself for some more advanced practice.
For that reason I try to replicate a excel like pivot table for ...
- 1
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votes
1
answer
12
views
Why is This _Generic Statement Giving an "Expression expected" Error?
I am writing an implementation of a dynamic array in C11. The keyword _Generic comes along with the C11 standard and is supported in my version of GCC (14.1.1) as far as I know. I have worked with it ...
- 96
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1
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39
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Infer the return type based on a parameter
I've a function that takes an action "DELETE"|"RENAME"|"MOVE"|etc...
I would like the return type to be different depending on the action fired.
For example, "DELETE&...
- 19
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votes
1
answer
53
views
How to a return generic type in go [duplicate]
I'm very new to go, still in the phase of learning and couldn't find any answers matching to my issue, so please don't downvote.
I have this generic interface which can be instantiated by two type ...
- 443
1
vote
1
answer
64
views
How to design events and event handlers system using generic in C#?
I want to create an event system in my ASP.NET Core backend using generics for ease of creation and registration of handlers.
The main problem I encountered while trying several solutions was generic ...
- 666
1
vote
2
answers
38
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C# reflection: Get static method with multiple generic overloads [duplicate]
How we can get a method such as Tuple.Create that has multiple generic overloads through reflection and use it with our custom generic type arguments?
usecase: the generic type arguments are known ...
- 310
2
votes
1
answer
34
views
What’s the meaning of `T extends readonly unknown[] | []` in TypeScript’s function signature of `Promise.all`?
I noticed an interesting (possibly hacking) part in TypeScript’s lib.d.ts:
interface PromiseConstructor {
/* ... */
/**
* Creates a Promise that is resolved with an array of results when all ...
- 369