QPQ-AG/sophia
10
0
Fork 0
Code Issues 41 Pull Requests 5 Actions Packages Projects Releases 16 Wiki Activity

Note about type variance

Browse Source
This commit is contained in:
Gaith Hallak 2022-07-25 01:10:00 +04:00
parent 6c8715ea74
commit 2ea56ce7ef
1 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
docs/sophia_features.md
View File

@ -191,7 +191,15 @@ contract interface X : Z =
entrypoint z() = 1 entrypoint z() = 1
``` ```
The following subtyping rules apply: #### Subtyping
The subtyping rules below, mention the variance of a type, which is defined in [Wikipedia](https://en.wikipedia.org/wiki/Covariance_and_contravariance_(computer_science)) as follows:
>Variance refers to how subtyping between more complex types relates to subtyping between their components.
You can refer to the Wikipedia page for further understanding of type variance.
In Sophia, the following subtyping rules apply:
- A function type `(Args1) => Ret1` is a subtype of `(Args2) => Ret2` when `Ret1` - A function type `(Args1) => Ret1` is a subtype of `(Args2) => Ret2` when `Ret1`
is a subtype of `Ret2` and each argument type from `Args2` is a subtype of its is a subtype of `Ret2` and each argument type from `Args2` is a subtype of its