http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53990
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|wrong-code |accepts-invalid
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
Severity|major |normal
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-07-17
06:00:37 UTC ---
>Is this optimization in C++ standard?
Yes it is the named return value optimization which is part of the C++
standard.
> A[2] = E[1]; //it works. but should it work?
This code is valid but most likely does not do what you want it to do.
In that it creates a temporary variable (a rvalue) to hold A[2]. Then it calls
operator= on that rvalue (which is valid).
