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I Don't Use Exceptions in C++ Anymore (thelig.ht)

submitted 1 year ago by [email protected] to c/programming

18 comments fedilink hide all child comments

Using exceptions in C++ desktop and server applications overall made sense to me. As I expanded my usage of C++ into other domains, specifically embedded domains, I began to experience more compelling reasons not to use exceptions first-hand...

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[–] lysdexic 1 points 1 year ago* (last edited 1 year ago) (1 children)

compiler support

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.

[–] BatmanAoD 1 points 1 year ago (1 children)

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.

[–] lysdexic 1 points 1 year ago* (last edited 1 year ago) (1 children)

Unless I’m misreading, you brought monads into it.

You're misreading it. What do you think a 'Result' type is?

[–] BatmanAoD 1 points 1 year ago (1 children)

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.

[–] lysdexic 1 points 1 year ago* (last edited 1 year ago) (1 children)

Well, in Rust, it’s a sum-type

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++.

[–] BatmanAoD 1 points 1 year ago

The discussion was about sum types. The top-level comment, the one to which you originally responded, says:

It's a shame that sum type support is still so lacking in C++. Proper Result types (ala Haskell or Rust) are generally much nicer to deal with, especially in embedded contexts.