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1,903
questions
0
votes
1
answer
21
views
Rust generic lifetime elision issue
I am trying to a implement generic observable collections for use with a UI framework I'm writing. I'm currently having an issue with lifetimes not being elidable in generics.
For brevity the ...
0
votes
0
answers
22
views
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<...
- 2,794
-2
votes
0
answers
38
views
Returning an array of raw type but instead of an array of parameterized type specified at the header
protected Collection<Node> createBucket() {
return new LinkedList<>();
}
/**
* Returns a table to back our hash table. As per the comment
* above, this table can be an array of ...
- 1
1
vote
2
answers
73
views
Can't understand the reason for this Typescript generic issue
I am learning TS and have the following code:
function getOrDefault<T = string>(value: T, defaultValue: T, car: T): T {
return value || defaultValue;
}
const strValue = getOrDefault("...
- 1,969
0
votes
2
answers
33
views
Generic types dependencies between function arguments
I'm trying to use binding for a game engine. And I want to add a little typing
/** Engine external functions */
export type Message<TBody> = { }
// This function returns same unique object for ...
- 11
0
votes
1
answer
86
views
Should I prefer `dynamic` or `Object?` for generics in Dart?
I've been trying to understand how I should enforce the strict-raw-types rule from Dart, and make sure my code adheres strictly to the type system.
I understand the difference between dynamic and ...
- 5,652
3
votes
1
answer
126
views
What is the difference between the types Null and Null & T where T <: AnyRef?
Look at the following method
def toOption[T <: AnyRef](value: T | Null): Option[T] =
value match {
case null => None
case content: T => Some(content)
}
If you ...
- 1,216
0
votes
0
answers
61
views
How to specialize the return type of a method in Kotlin
I want to implement a specific persistence in Kotlin, where I need to wrap the object to be persisted; yet, I still want to access some part of the persisted (generic) object in a type-safe way. How ...
- 1,834
0
votes
1
answer
39
views
Subclassing a generic Kotlin class with type constraint
I'm running into problems combining subclassing polymorphism and generics (ad-hoc polymorphism) in Kotlin.
Here are my type definitions:
interface State
interface StatefulContainer<out S : State&...
- 1,834
0
votes
1
answer
51
views
Scala type mismatch error involving generics and refined types
The following is a simplified version of a type-mismatch error I'm trying to solve:
trait Foo[A] {
type B
val b: B
}
trait Bar[T, R[_]] {
val r: R[T]
}
object TypeMismatch extends App {
def ...
- 338
1
vote
1
answer
33
views
Use TS Generics for a object using another object key and value type
I'm having some trouble using Generics in typescript.
I want to create an object based on another object type using Generics.
My starting point was this doc from TS
This is what I have come up so far:
...
1
vote
0
answers
20
views
Conditional types incorrectly infer union types [duplicate]
I am trying to write a function that conditionally infers the type of a generic input parameter that is a union. When I make the input type conditional, it throws an error showing that it infers the ...
0
votes
2
answers
39
views
C# Generic Method passed as argument, Argument type 'bool' is not assignable to parameter type 'System.Func<bool>'
I am attempting to create a generic array iterator which goes iterates through a multidimensional array assigning each element with the result of a function.
When trying the following code I get the ...
1
vote
1
answer
78
views
How do I get a type safe function return value in this case?
In the below code example I would like my IDE to accept mySap.rootValues[0].test2 and mySap.rootValues[1].test4 as valid. Right now, it doesn't, because rootValues[0] and rootValues[1] are of type ...
- 53
0
votes
0
answers
23
views
Bound and Unbound types in C# [duplicate]
Bound and Unbound types in C#
The term unbound type refers to a non-generic type or an unbound generic type. The term bound type refers to a non-generic type or a constructed type.
What does an ...
