[v3] basic_string::reserve() shrink-to-fit?

[Paolo Carlini]

Neil Ferguson wrote:

>   template<typename _CharT, typename _Traits, typename _Alloc>
>     void
>     basic_string<_CharT, _Traits, _Alloc>::reserve(size_type __res)
>     {
> >>    if (__res != this->capacity() || _M_rep()->_M_is_shared())
>         {
>           if (__res > this->max_size())
>             __throw_length_error("basic_string::reserve");
>           // Make sure we don't shrink below the current size
>           if (__res < this->size())
>             __res = this->size();
>           allocator_type __a = get_allocator();
>           _CharT* __tmp = _M_rep()->_M_clone(__a, __res - this->size());
>           _M_rep()->_M_dispose(__a);
>           _M_data(__tmp);
>         }
>     }
>
> -- 
>
> so that __res only needs to be different from capacity(), rather than
> greater,

First blush (no testsuite, etc...), seems a good idea to me, Nathan?

Paolo.