slice valarrays with std::string -> segfault

[Paolo Carlini]

Gabriel Dos Reis wrote:
> | As regards avoiding the additional layer, in principle seems certainly
> | feasible, I was quickly mimicking what currently happens when
> | __valarray_copy is used (i.e., those intermediate templates around 2/3
> | of valarray_array.h).
>
> I see.  I'm just back to home; I'll try to cook some patch -- given
> the time in EU :-)
>   
That would be great! In case you need an hand for something, just let me 
know...

Enjoy old Europe! ;)

Paolo.