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I Don't Use Exceptions in C++ Anymore
(thelig.ht)
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this post was submitted on 19 Aug 2023
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Programming
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You seem to be ignoring the benefits of compiler support as mentioned in the comment above.
That remark was on sum types, not monads. You do not need "compiler support" to have Result or neither monads in C++. There are already plenty of libraries that implement those. I use them in some of my projects. No compiler support needed.
As I said, sum types are not required for Return or Either monads. At best, they are convenient.
The original claim wasn't that you can't implement monads in C++, it was that compiler support is needed for "good" sum types. Unless I'm misreading, you brought monads into it. And they're not totally orthogonal: sum types are a very good way to implement monads.
You're misreading it. What do you think a '
Result' type is?Well, in Rust, it's a sum-type, with functions that also let you use it like a monad instead of using explicit pattern matching.
The discussion is on to use monads in C++, and not on why is C++ different than Rust.
I repeat: you do not need sum types to implement a Result monad in C++.
The discussion was about sum types. The top-level comment, the one to which you originally responded, says: