In

https://www.youtube.com/watch?v=nVzgkepAg5Y

Andrei describes his proposal for STL `Expected` planned to be included in C++20.

Have anybody converted the C++ proposal to idiomatic D, yet?

Hopefully without the pointer-legacy which unfortunately was allowed into `std:optional`.

Andrei claims we should it as return types for non-throwing variants of parse() and to() in the works at

https://github.com/dlang/phobos/pull/6665

On Thursday, 16 August 2018 at 20:37:33 UTC, Per Nordlöw wrote:
> In
>
> https://www.youtube.com/watch?v=nVzgkepAg5Y
>
> Andrei describes his proposal for STL `Expected` planned to be included in C++20.
>
> Have anybody converted the C++ proposal to idiomatic D, yet?
>
> Hopefully without the pointer-legacy which unfortunately was allowed into `std:optional`.
>
> Andrei claims we should it as return types for non-throwing variants of parse() and to() in the works at
>
> https://github.com/dlang/phobos/pull/6665

I've got a basic version up and running:

https://github.com/pbackus/expected

On Thursday, 16 August 2018 at 20:37:33 UTC, Per Nordlöw wrote:
> In
>
> https://www.youtube.com/watch?v=nVzgkepAg5Y
>
> Andrei describes his proposal for STL `Expected` planned to be included in C++20.
>
> Have anybody converted the C++ proposal to idiomatic D, yet?
>
> Hopefully without the pointer-legacy which unfortunately was allowed into `std:optional`.
>
> Andrei claims we should it as return types for non-throwing variants of parse() and to() in the works at
>
> https://github.com/dlang/phobos/pull/6665

I get the feeling from the talk that Andrei has some opinions about how it should be done that aren't completely in line with what has been proposed for the C++ standard.

On Tuesday, 28 August 2018 at 10:18:29 UTC, John Colvin wrote:
> I get the feeling from the talk that Andrei has some opinions about how it should be done that aren't completely in line with what has been proposed for the C++ standard.

Anyhow my implementation at

https://github.com/nordlow/phobos-next/blob/master/src/expected.d

should match his C++ code in the lecture, AFAICT.

My code doesn't depend on other modules an compiles very fast (~46 ms in my machine) (with DMD -debug -unittest).