[Bug c++/64870] value not set via reference

glisse at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Fri Jan 30 07:14:00 GMT 2015


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64870

--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Conrad from comment #2)
> Notwithstanding loopholes in C++ legalese,

No loopholes, this was a deliberate choice in C.

> the expected result is to
> evaluate things left to right, just like reading words and sentences.

Except when there is an = sign, where you expect the right hand side to be
evaluated before the left? And maybe a few other cases?

> clang produces the least surprising result.  With gcc we end up with "wtf?"

C/C++ programmers learn about that soon enough.

> What is the benefit in changing the expected order of evaluation?

Performance.



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