Killing the comma operator

Timon Gehr via Digitalmars-d digitalmars-d at puremagic.com
Tue May 10 14:53:01 PDT 2016


On 10.05.2016 23:47, deadalnix wrote:
> On Tuesday, 10 May 2016 at 17:57:38 UTC, Steven Schveighoffer wrote:
>> On 5/10/16 9:53 AM, Meta wrote:
>>>> Do you like comma expressions, and think its presence in the language
>>>> is more pro than con ?
>>>
>>> It should've been killed off a long time ago. It only causes bugs and
>>> can easily be replaced with a library feature if necessary. I think
>>> Andrei suggested that it should be changed so that the comma expression
>>> returns `void` instead of the last expression evaluated.
>>
>> Andrei pointed out (in an earlier PR) that making the return type void
>> isn't correct either. You can still use void in some cases, e.g.:
>>
>> auto foo(a)
>> {
>>    return ++a, ++a;
>> }
>>
>> This should still be disallowed.
>>
>> -Steve
>
> It doesn't make it incorrect, just insufficient.
>

Let's make it correct and sufficient.


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