On Tuesday, 12 July 2016 at 05:46:58 UTC, Patrick Schluter wrote:
On Tuesday, 12 July 2016 at 00:16:58 UTC, deadalnix wrote:
On Monday, 11 July 2016 at 23:31:40 UTC, Danika wrote:
On Monday, 11 July 2016 at 23:04:00 UTC, Johan Engelen wrote:
LDC recently changed the evaluation order of "+=" (I think
unintentionally, some other eval order problems were fixed).
Now, it is different from DMD.
I am going to argue that I think DMD's order is more useful
in the context of fibers, and would like your opinion.
I really think it is a bug, in C it prints 10. And following
the flow, you changed the sum to 9 and after that added 1, so
It would be 10.6
In C, it is UB.
A function call is a sequence point in C, so it is not UB.
UB happens when a variable is changed more than once between
sequence points, which is not the case here.
What happens here in LDC is probably that the call is inlined
and therefore losing the sequence point. That is one of the
dangers of aggressive inlining. The behaviour described by op
would be definitly a bug in C. For D I don't know as I don't
know if the sequence point rules are as strictly defined as in
C.
