digitalmars.D - when will we have ` nogc nothrow` value exceptions in D?
- Moth (5/5) Jun 03 2022 right now, trying to emulate exceptions in `@nogc nothrow` code
- Paul Backus (14/19) Jun 03 2022 Realistically: there's a good chance D never gets language
right now, trying to emulate exceptions in ` nogc nothrow` code means i have to add 50 `if (errorCode != ErrorCode.Ok) { return errorCode }`s everywhere, and use out parameters if i want to actually return anything. it would be so much nicer [and cleaner!] if there was some kind of language support for this.
Jun 03 2022
On Friday, 3 June 2022 at 23:13:39 UTC, Moth wrote:right now, trying to emulate exceptions in ` nogc nothrow` code means i have to add 50 `if (errorCode != ErrorCode.Ok) { return errorCode }`s everywhere, and use out parameters if i want to actually return anything. it would be so much nicer [and cleaner!] if there was some kind of language support for this.Realistically: there's a good chance D never gets language support for this, and even if it does, it'll probably be a long time. The best we can do in the short term is a Rust-style `Result` type with methods like [`andThen`][1], [`map`][2], and [`mapErr`][3] that allow us to chain functions together in a pipeline that automatically propagates errors. [1]: https://doc.rust-lang.org/std/result/enum.Result.html#method.and_then [2]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map [3]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_err
Jun 03 2022