50,297 questions
0
votes
0
answers
32
views
Typescript Generic and Non-Generic Version of Type 2 -Define VOID property?
To build off of the question found here: Typescript Generic and Non-Generic Version of Type
The question asks: "how to have a generic and non-generic version of a typescript type" like
...
- 1,193
0
votes
0
answers
49
views
C# - Can the JIT optimize generic type checking? [closed]
I am attempting to make a parse function to parse common types from a string such that;
public static T FromSpan<T>(string Value)
{
if (typeof(T) == typeof(string))
{
return (T)(...
0
votes
1
answer
45
views
Swift generic specialized type prevents protocol conformance
In swift, given the following protocols
protocol Mark {}
protocol Detector {
associatedType ViewType: View
func check(mark: some Mark) -> ViewType
}
Non-specialized ContentView compiles
...
- 614
2
votes
1
answer
54
views
How to document what the generic type parameters of a Func are? [closed]
Suppose you have a property which is a Func<T1, T2, TResult>. How do you provide inline documentation for what T1 and T2 are? Example:
public class MyClass
{
/// <summary>Checks ...
- 11.5k
1
vote
1
answer
51
views
Swift protocol function requirement with both generic function arguement and generic return type
For a protocol
protocol Mark {}
Why would this compile 👉 generic argument only
protocol Detector {
func check(mark: some Mark)
}
class Vision: Detector { // conforms
func check(mark: some ...
- 614
-1
votes
1
answer
88
views
Go argument concrete type checking [duplicate]
Given the following example
package main
type I interface {
Do()
}
type S struct {}
func (s *S) Do() {}
func Handler(h func (i I) error) {
// ...
}
func Wrapper(i I) func (i I) error {
...
- 135
0
votes
2
answers
118
views
How to make a Java static function, which returns an instance of its parent class, generic?
I have some code that I'd like to make more generic - at the moment it uses one enum (which I've loaded up with various other fields and static objects) and I'd like to be able to extend it to use ...
- 35
0
votes
3
answers
71
views
How to take a list of parent class objects and create a list of child class objects that the original list was created with? [closed]
I am not very proficient in Java. I am using java 1.8. I have the following class structure.
class Parent {
}
class Child1 extends Parent {
}
class Child2 extends Parent {
}
.
.
.
class Childn ...
- 1,343
-1
votes
0
answers
67
views
Nullable out parameter in generic method can't be null
I am struggling a bit to write a C# method that will return null instead of default in certain situations but it seems tricky given that the types are generic and that the constraints (when applied to ...
7
votes
1
answer
190
views
Why is the Unit type treated in a special way in Kotlin?
Please explain this behavior in Kotlin:
data class A<T>(val p: T)
class B
fun f1(): A<Number> = A(B()) as A<Number>
fun f2(): A<Unit> = A(B()) as A<Unit>
fun main() {
...
- 73
0
votes
0
answers
71
views
Is it possible to get rid of redundant generic parameters [duplicate]
I tried to look around first, and I suppose this question is similar, but the Jon Skeet's answer, though accepted, is a bit too laconic for me. Besides, my situation is a bit different. First, the ...
- 7,732
1
vote
0
answers
48
views
Why does the compiler fail to find the correct function? [duplicate]
I have this generic function:
pub fn bounding_circle<V>(
points: &dyn Fn(usize) -> V,
point_count: usize,
)
where
V: InnerSpace<f32> + Debug + Copy,
for<'x> &...
- 9,708
-1
votes
1
answer
93
views
Why does Go not support generics in struct fields? [closed]
I have
SpendingCreateEvent
SpendingDeleteEvent
SpendingUpdateEvent
These are events that have similar fields.
All of the events (SpendingCreateEvent, SpendingDeleteEvent, SpendingUpdateEvent) have ...
- 53
1
vote
2
answers
114
views
Can't convert Supplier<S> into Supplier<?>
I have a very simple Java class that looks like this
public class StatementRegister {
public static final Map<String, Supplier<Statement<?>>> registry = new HashMap<>();
...
- 111
1
vote
3
answers
45
views
Instance of abstract class with generic type coming out as never when it's narrowed
I was in need of a way to change the parameters and return type of a class function if a field from this class is true, taking into account that i have an abstract class and a bunch (more than 6) of ...
