F# forward type declarations
-
21-09-2019 - |
Question
I stumbled across this problem in F#. Suppose, I want to declare two types that reference each other:
type firstType =
| T1 of secondType
//................
type secondType =
| T1 of firstType
//................
How do I do that, so the compiler does not generate an error?
Solution
You use 'and':
type firstType =
| T1 of secondType
and secondType =
| T1 of firstType
OTHER TIPS
I figured it. It's:
type firstType =
| T1 of secondType
//................
and secondType =
| T1 of firstType
//................
The limitation is that the types have to be declared in the same file.
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