[Bug c++/70744] preincrements possibly double-evaluated in GNU ternaries

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70744

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
You're right.  Of course - in C++, ++i and --i are considered lvalues, while
i++ and i-- are not.