williamr@4: 
williamr@4: #ifndef BOOST_MPL_SET_AUX_ITERATOR_HPP_INCLUDED
williamr@4: #define BOOST_MPL_SET_AUX_ITERATOR_HPP_INCLUDED
williamr@4: 
williamr@4: // Copyright Aleksey Gurtovoy 2003-2004
williamr@4: // Copyright David Abrahams 2003-2004
williamr@4: //
williamr@4: // Distributed under the Boost Software License, Version 1.0. 
williamr@4: // (See accompanying file LICENSE_1_0.txt or copy at 
williamr@4: // http://www.boost.org/LICENSE_1_0.txt)
williamr@4: //
williamr@4: // See http://www.boost.org/libs/mpl for documentation.
williamr@4: 
williamr@4: // $Source: /cvsroot/boost/boost/boost/mpl/set/aux_/iterator.hpp,v $
williamr@4: // $Date: 2005/06/18 22:03:09 $
williamr@4: // $Revision: 1.4 $
williamr@4: 
williamr@4: #include <boost/mpl/set/aux_/set0.hpp>
williamr@4: #include <boost/mpl/has_key.hpp>
williamr@4: #include <boost/mpl/iterator_tags.hpp>
williamr@4: #include <boost/mpl/next.hpp>
williamr@4: #include <boost/mpl/eval_if.hpp>
williamr@4: #include <boost/mpl/if.hpp>
williamr@4: #include <boost/mpl/identity.hpp>
williamr@4: #include <boost/mpl/aux_/config/ctps.hpp>
williamr@4: 
williamr@4: namespace boost { namespace mpl {
williamr@4: 
williamr@4: // used by 's_iter_impl'
williamr@4: template< typename Set, typename Tail > struct s_iter;
williamr@4: 
williamr@4: template< typename Set, typename Tail > struct s_iter_impl
williamr@4: {
williamr@4:     typedef Tail                        tail_;
williamr@4:     typedef forward_iterator_tag        category;
williamr@4:     typedef typename Tail::item_::type  type;
williamr@4: 
williamr@4: #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
williamr@4:     typedef typename eval_if< 
williamr@4:           has_key< Set,typename Tail::next_::type >
williamr@4:         , identity< s_iter<Set,typename Tail::next_> >
williamr@4:         , next< s_iter<Set,typename Tail::next_> >
williamr@4:         >::type next;        
williamr@4: #endif
williamr@4: };
williamr@4: 
williamr@4: #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
williamr@4: 
williamr@4: template< typename Set, typename Tail > 
williamr@4: struct next< s_iter<Set,Tail> >
williamr@4:     : eval_if< 
williamr@4:           has_key< Set,typename Tail::next_::type >
williamr@4:         , identity< s_iter<Set,typename Tail::next_> >
williamr@4:         , next< s_iter<Set,typename Tail::next_> >
williamr@4:         >
williamr@4: {
williamr@4: };
williamr@4: 
williamr@4: template< typename Set > 
williamr@4: struct next< s_iter<Set,set0<> > >
williamr@4: {
williamr@4:     typedef s_iter<Set,set0<> > type;
williamr@4: };
williamr@4: 
williamr@4: template< typename Set, typename Tail > struct s_iter
williamr@4:     : s_iter_impl<Set,Tail>
williamr@4: {
williamr@4: };
williamr@4: 
williamr@4: template< typename Set > struct s_iter<Set, set0<> >
williamr@4: {
williamr@4:     typedef forward_iterator_tag category;
williamr@4: };
williamr@4: 
williamr@4: #else
williamr@4: 
williamr@4: template< typename Set >
williamr@4: struct s_end_iter
williamr@4: {
williamr@4:     typedef forward_iterator_tag    category;
williamr@4:     typedef s_iter<Set,set0<> >     next;
williamr@4: };
williamr@4: 
williamr@4: template< typename Set, typename Tail > struct s_iter
williamr@4:     : if_< 
williamr@4:           is_same< Tail,set0<> >
williamr@4:         , s_end_iter<Set>
williamr@4:         , s_iter_impl<Set,Tail>
williamr@4:         >::type
williamr@4: {
williamr@4: };
williamr@4: 
williamr@4: #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
williamr@4: 
williamr@4: }}
williamr@4: 
williamr@4: #endif // BOOST_MPL_SET_AUX_ITERATOR_HPP_INCLUDED