sequence points

[Doug Gwyn]

In article <103459 at convex.convex.com> grogers at convex.com (Geoffrey Rogers) writes:
>>	func1(<argument list>) + func2(<argument list>)
>The dp ANSI, Dec 89, page 42, states "The order of evaluation of the function
>designator, the arguments, and subexpressions within the arguments are 
>unspecified, but there is a sequence point before the actual call". This
>would lead me to believe that you can evaluate all of the arguments for
>both functions before calling either one.

The important point is that the + operator does not impose an order of
evaluation on its operands.  As you note, the arguments to a function
must be completely evaluated (including side effects) before the
function is called.  How much before is not specified, other than that
it must be after the previous sequence point.