[Bug libstdc++/99117] [9/10/11 Regression] cannot accumulate std::valarray

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99117

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
So is Jakub wrong in comment 5 when he suggests that this should "lose" the
__restrict__ qualification?

      _Tp* __p (__a._M_data);

Is there a better way to drop that qual so that we can assign something to the
elements of __a._M_data that aliases itself?

Presumably this would be guaranteed to work?

      _Tp* __p (__a._M_data);
      for (size_t __i = 0; __i < __n; ++__i, ++__p)
      {
        _Tp __tmp = __e[__i];
        *__p = __tmp;
      }