invariance Questions
2
Solved
Could you please explain using small and simple TypeScript examples what is Variance, Covariance, Contravariance, Bivariance and Invariance?
Goober asked 28/2, 2021 at 14:30
3
Solved
I've read some articles about Covariance, Contravariance, and Invariance in Java, but I'm confused about them.
I'm using Java 11, and I have a class hierarchy A => B => C (means that C is a s...
Aw asked 16/5, 2022 at 12:16
2
Solved
After writing this piece of code
module type TS = sig
type +'a t
end
module T : TS = struct
type 'a t = {info : 'a list}
end
I realised I needed info to be mutable.
I wrote, then :
module type...
Reno asked 9/11, 2016 at 15:10
2
Solved
References to wrapper types like &Rc<T> and &Box<T> are invariant in T (&Rc<T> is not a &Rc<U> even if T is a U). A concrete example of the issue (Rust Playg...
Brainwashing asked 1/6, 2016 at 23:50
2
Solved
Reviewing Java 8 Stream API design, I was surprised by the generic invariance on the Stream.reduce() arguments:
<U> U reduce(U identity,
BiFunction<U,? super T,U> accumulator,
Binary...
Pamper asked 28/2, 2016 at 9:18
1
The following code in Julia:
function foo(a::Vector{AbstractString})
end
foo(["a"])
gives the following error:
ERROR: MethodError: no method matching foo(::Array{String,1})
Closest candidates...
Scrubland asked 30/1, 2014 at 19:32
1
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