mpl/aux_/size_impl.hpp

0001
0002 #ifndef BOOST_MPL_AUX_SIZE_IMPL_HPP_INCLUDED
0003 #define BOOST_MPL_AUX_SIZE_IMPL_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/size_fwd.hpp>
0018 #include <boost/mpl/begin_end.hpp>
0019 #include <boost/mpl/distance.hpp>
0020 #include <boost/mpl/aux_/traits_lambda_spec.hpp>
0021 #include <boost/mpl/aux_/config/workaround.hpp>
0022
0023 namespace boost { namespace mpl {
0024
0025 // default implementation; conrete sequences might override it by
0026 // specializing either the 'size_impl' or the primary 'size' template
0027
0028 template< typename Tag >
0029 struct size_impl
0030 {
0031     template< typename Sequence > struct apply
0032 #if !BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x561))
0033         : distance<
0034               typename begin<Sequence>::type
0035             , typename end<Sequence>::type
0036             >
0037     {
0038 #else
0039     {
0040         typedef typename distance<
0041               typename begin<Sequence>::type
0042             , typename end<Sequence>::type
0043             >::type type;
0044 #endif
0045     };
0046 };
0047
0048 BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, size_impl)
0049
0050 }}
0051
0052 #endif // BOOST_MPL_AUX_SIZE_IMPL_HPP_INCLUDED