https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87544
--- Comment #7 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #5)
> static size_type
> _S_max_size(const _Tp_alloc_type& __a) _GLIBCXX_NOEXCEPT
> {
> - const size_t __diffmax =
> __gnu_cxx::__numeric_traits<ptrdiff_t>::__max;
> + // std::distance(begin(), end()) cannot be greater than PTRDIFF_MAX,
> + // and realistically we can't store more than PTRDIFF_MAX/sizeof(T)
> + // (even if std::allocator_traits<A>::max_size() says we can).
> + const size_t __diffmax
> + = __gnu_cxx::__numeric_traits<ptrdiff_t>::__max / sizeof(_Tp);
> const size_t __allocmax = _Alloc_traits::max_size(__a);
> return (std::min)(__diffmax, __allocmax);
> }
This looks like a more useful value for __diffmax indeed. And the standard even
seems ok with us doing that :-)
