#ifndef BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED | |
#define BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED | |
// Copyright Aleksey Gurtovoy 2000-2004 | |
// | |
// Distributed under the Boost Software License, Version 1.0. | |
// (See accompanying file LICENSE_1_0.txt or copy at | |
// http://www.boost.org/LICENSE_1_0.txt) | |
// | |
// See http://www.boost.org/libs/mpl for documentation. | |
// $Id: O1_size_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ | |
// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ | |
// $Revision: 49267 $ | |
#include <boost/mpl/O1_size_fwd.hpp> | |
#include <boost/mpl/long.hpp> | |
#include <boost/mpl/if.hpp> | |
#include <boost/mpl/aux_/has_size.hpp> | |
#include <boost/mpl/aux_/config/forwarding.hpp> | |
#include <boost/mpl/aux_/config/static_constant.hpp> | |
#include <boost/mpl/aux_/config/msvc.hpp> | |
#include <boost/mpl/aux_/config/workaround.hpp> | |
namespace boost { namespace mpl { | |
// default implementation - returns 'Sequence::size' if sequence has a 'size' | |
// member, and -1 otherwise; conrete sequences might override it by | |
// specializing either the 'O1_size_impl' or the primary 'O1_size' template | |
# if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) \ | |
&& !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003)) | |
namespace aux { | |
template< typename Sequence > struct O1_size_impl | |
: Sequence::size | |
{ | |
}; | |
} | |
template< typename Tag > | |
struct O1_size_impl | |
{ | |
template< typename Sequence > struct apply | |
#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING) | |
: if_< | |
aux::has_size<Sequence> | |
, aux::O1_size_impl<Sequence> | |
, long_<-1> | |
>::type | |
{ | |
#else | |
{ | |
typedef typename if_< | |
aux::has_size<Sequence> | |
, aux::O1_size_impl<Sequence> | |
, long_<-1> | |
>::type type; | |
BOOST_STATIC_CONSTANT(long, value = | |
(if_< | |
aux::has_size<Sequence> | |
, aux::O1_size_impl<Sequence> | |
, long_<-1> | |
>::type::value) | |
); | |
#endif | |
}; | |
}; | |
# else // BOOST_MSVC | |
template< typename Tag > | |
struct O1_size_impl | |
{ | |
template< typename Sequence > struct apply | |
: long_<-1> | |
{ | |
}; | |
}; | |
# endif | |
}} | |
#endif // BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED |