Changing the behavior of the comma operator

[Kenji Hara]

2014-03-26 2:33 GMT+09:00 Andrei Alexandrescu <SeeWebsiteForEmail at erdani.org
>:

> After the recent discussions regarding the comma operator, and after
> inspecting the patterns of code affected by it, Walter and I would back up
> the following change to the D language:
>
> 1. The comma operator stays with its current syntax.
>
> 2. The semantics is the same unless warnings are enabled with "-w"
>
> 3. In "-w" mode, semantics are changed in that the type of the comma
> operator is NOT the type of its last expression, but instead it's void.
>
> 4. Later on the warning will be promoted to a deprecation followed by
> removal from the language.
>
> 5. Reintroducing the result type as a tuple remains a future possibility.
>
> We believe the change would be beneficial for the following reasons:
>
> 1. Based on druntime and phobos, the breakage is likely to be infrequent.
>
> 2. The change may catch (and has caught) important bugs caused by
> misplacing closing parentheses.
>
> 3. Most code using the result of the comma expression looks foreign even
> to seasoned programmers and might gain in clarity from a refactor.
>
>
> Please reply to discuss this possibility.


Sounds good. Typing comma expressions as void would be a good way.

Kenji Hara
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