Re: Function call evaluation order

"Cheng" <chengwuchew@xxxxxxxxxxx> wrote in message
news:u8X%23alhTGHA.4340@xxxxxxxxxxxxxxxxxxxx
I need help to explain the behavior with the code below. I would
like to chain up function call into a single line, while the order of
the function call is correct, I cannot be certain with order the
expression within the function call is evaluated.

Woud it be better, then, to write all the function call into seperate
lines?

s.assign(data[i++]).append(data[i++]).append(data[i++]);

Not only would it be better - you must do so. The statement shown above
exhibits undefined behavior. There exists a possible legal order of
execution of various subexpressions that results in the variable 'i'
being modified more than once between sequence points.
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925


.

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