Is there always the same execution sequence for various conditions in a If Statement in C++ for all compilers?

Question

Lets assume a simple If Statement with two conditions A and B:

If ( condA && condB)

Is the Sequenz for all compilers the Same?

And is the execution of condition B therefore optional, in case condition A is already false?

It's not optional -- if A is false then B is definitely not executed — M.M, Mar 14 '20 at 01:04

score 4 · Answer 1 · edited Mar 14 '20 at 00:06

4

Yes. Not evaluating condition B if A is false is called short circuit logic, and this behavior is guaranteed by the language specification.

edited Mar 14 '20 at 00:06

Ernte1893

answered Mar 14 '20 at 00:03

Mureinik

1

have to add "only for built-in operators". If operators are redefined then short-circuiting is not happening and order of evaluation might be defined or not, based on what standard we talk about. Latest standard defines the order of function argument evaluation, earlier ones do not. – Swift - Friday Pie Mar 14 '20 at 00:09

1 Answers1