[Bug libstdc++/112925] Optimize std::string construction from std::istreambuf_iterator

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112925

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #0)
> +#if __cplusplus >= 201103L && 0

Oops, without the && 0 obviously. I was testing performance with and without
it.