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