[Bug libstdc++/56193] ios_base should replace operator void* with explicit operator bool in C++11 onwards.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56193

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It will be ready when it's ready - there are bigger issues that are higher
priority