On 5/24/15 3:36 PM, Iain Buclaw via Digitalmars-d wrote:
On 25 May 2015 00:20, "Andrei Alexandrescu via Digitalmars-d"
<digitalmars-d@puremagic.com <mailto:digitalmars-d@puremagic.com>> wrote:
>
> On 5/24/15 1:29 PM, Timon Gehr wrote:
>>
>> BTW, the documentation contradicts itself on evaluation order:
>> http://dlang.org/expression.html
>
>
> This comes up once in a while. We should stick with left to right
through and through. It's a "simple" matter of getting somebody on the
compiler team to find the time for it. -- Andrei
>
I find it is not as clear cut as that. In gdc, there is a compiler flag
that tells the optimizer to honour left to right evaluation, and because
of both what you say and the agreement of others, it seems natural to
have this turned on by default.
Even better - the front end could force the sequencing.
However, this has an interesting side effect with operations with side
effects. Ie: foo += bar() could either produce expected or surprising
results.
Hint, the LTR order - foo = foo + bar() - gives the most surprise in my
experience from users.
I think LTR is the most sensible in all cases. -- Andrei
