Aleksey Gurtovoy wrote:
Alexander Nasonov writes:
For the purpose of forward declaration of class templates this read-only lightweight sequence might be useful. For example, one might declare class template Selector in fwd file:
// empty_sequence.hpp is designed for inclusion into fwd files #include <boost/mpl/empty_sequence.hpp>
template<class Variants = empty_sequence> class Selector;
Seems like a reasonable wish, somewhat correlating with 'single_view' (http://tinyurl.com/yqfp2). Why don't you write up the docs for it, and I'll put it in? A reference page template attached.
Ok. I'll do it.
This is not yet complete. I hope that support for some transformations will be added later (transformation doesn't change empty_sequence unless the size is changed)
I am afraid I don't understand this part.
I was trying to say that the following doesn't work transform_view<empty_sequence, add_pointer<_1> >. Any transformation that doesn't change the size of empty_sequence is certainly a trivial transformation. Why not allow it to compile? If I understand MPL philosophy correctly it's enough to add clear_traits specialization. -- Alexander Nasonov Independent Developer and Consultant