vector/aux_/empty.hpp

0001
0002 #ifndef BOOST_MPL_VECTOR_AUX_EMPTY_HPP_INCLUDED
0003 #define BOOST_MPL_VECTOR_AUX_EMPTY_HPP_INCLUDED
0004
0005 // Copyright Aleksey Gurtovoy 2000-2004
0006 //
0007 // Distributed under the Boost Software License, Version 1.0.
0008 // (See accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011 // See http://www.boost.org/libs/mpl for documentation.
0012
0013 // $Id$
0014 // $Date$
0015 // $Revision$
0016
0017 #include <boost/mpl/empty_fwd.hpp>
0018 #include <boost/mpl/bool.hpp>
0019 #include <boost/mpl/vector/aux_/tag.hpp>
0020 #include <boost/mpl/aux_/config/typeof.hpp>
0021 #include <boost/mpl/aux_/config/ctps.hpp>
0022 #include <boost/type_traits/is_same.hpp>
0023
0024 namespace boost { namespace mpl {
0025
0026 #if defined(BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES)
0027
0028 template<>
0029 struct empty_impl< aux::vector_tag >
0030 {
0031     template< typename Vector > struct apply
0032         : is_same<
0033               typename Vector::lower_bound_
0034             , typename Vector::upper_bound_
0035             >
0036     {
0037     };
0038 };
0039
0040 #else
0041
0042 template<>
0043 struct empty_impl< aux::vector_tag<0> >
0044 {
0045     template< typename Vector > struct apply
0046         : true_
0047     {
0048     };
0049 };
0050
0051 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
0052
0053 template< long N >
0054 struct empty_impl< aux::vector_tag<N> >
0055 {
0056     template< typename Vector > struct apply
0057         : false_
0058     {
0059     };
0060 };
0061
0062 #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
0063
0064 #endif // BOOST_MPL_CFG_TYPEOF_BASED_SEQUENCES
0065
0066 }}
0067
0068 #endif // BOOST_MPL_VECTOR_AUX_EMPTY_HPP_INCLUDED