1 2 #ifndef BOOST_MPL_EMPTY_SEQUENCE_HPP_INCLUDED 3 #define BOOST_MPL_EMPTY_SEQUENCE_HPP_INCLUDED 4 5 // Copyright Aleksey Gurtovoy 2004 6 // Copyright Alexander Nasonov 2004 7 // 8 // Distributed under the Boost Software License, Version 1.0. 9 // (See accompanying file LICENSE_1_0.txt or copy at 10 // http://www.boost.org/LICENSE_1_0.txt) 11 // 12 // See http://www.boost.org/libs/mpl for documentation. 13 14 // $Id: empty_sequence.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ 15 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ 16 // $Revision: 49267 $ 17 18 #include <boost/mpl/size_fwd.hpp> 19 #include <boost/mpl/int.hpp> 20 #include <boost/mpl/iterator_tags.hpp> 21 22 namespace boost { namespace mpl { 23 24 struct empty_sequence 25 { 26 struct tag; 27 struct begin { typedef random_access_iterator_tag category; }; 28 typedef begin end; 29 }; 30 31 template<> 32 struct size_impl<empty_sequence::tag> 33 { 34 template< typename Sequence > struct apply 35 : int_<0> 36 { 37 }; 38 }; 39 40 }} 41 42 #endif // #ifndef BOOST_MPL_EMPTY_SEQUENCE_HPP_INCLUDED 43