[Bug libstdc++/57666] valarray<T>::operator= in c++11 mode does not adapt to size

[thunderliu at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57666

--- Comment #3 from thunderliu at gmail dot com ---
Sorry I missed that. But the remaining (which is the point of this bug) still
stands.

(In reply to Jonathan Wakely from comment #2)
> (In reply to thunderliu from comment #0)
> > Non-member operators for valarray<> returns instance of _Expr<> (lazy
> > evaluation?), instead of another valarray<>. This is non-conforming but
> > probably not a bug.
> 
> 26.6.1 [valarray.syn]/3 "Any function returning a valarray<T> is permitted
> to return an object of another type, provided all the const member functions
> of valarray<T> are also applicable to this type."