Add an unwrap adaptor to Range

[ne01026@…]

Iterator adaptors can be easily unwrapped by calling iterator .base (); range adaptors should provide a similar functionality.

My implementation:

namespace boost 
{ 
  namespace adaptors 
  { 
    namespace detail 
{ struct unwrap_forwarder {}; 
template < class P_R > 
inline 
::boost:: iterator_range 
    < typename ::boost:: range_iterator < P_R >:: type:: base_type > 
operator | (P_R const &p_r, detail:: unwrap_forwarder const &) 
    { 
return 
::boost:: make_iterator_range 
  (::boost:: begin (p_r). base (), ::boost:: end (p_r). base ()); } 
      /* !boost.adaptors.|unwrapped X */ } /* &boost.adaptors.detail X */
    namespace 
{ 
detail:: unwrap_forwarder const 
(&unwrapped) ((detail:: unwrap_forwarder ())); } 
 } /* &boost.adaptors X */ } /* &boost X */

My test:

int main () 
{ ::boost:: iterator_range < ::std:: string:: const_iterator > 
      ((::boost:: equal_range 
        (::std:: string () 
| ::boost:: adaptors:: transformed (::std:: negate < int > ()), 0) 
        | ::boost:: adaptors:: unwrapped)); }