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82 lines
1.8 KiB
C++
82 lines
1.8 KiB
C++
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#ifndef BOOST_MPL_NEGATE_HPP_INCLUDED
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#define BOOST_MPL_NEGATE_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/integral_c.hpp>
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#include <boost/mpl/aux_/msvc_eti_base.hpp>
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#include <boost/mpl/aux_/na_spec.hpp>
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#include <boost/mpl/aux_/lambda_support.hpp>
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#include <boost/mpl/aux_/config/eti.hpp>
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#include <boost/mpl/aux_/config/integral.hpp>
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#include <boost/mpl/aux_/config/static_constant.hpp>
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namespace boost { namespace mpl {
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template< typename Tag > struct negate_impl;
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template< typename T > struct negate_tag
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{
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typedef typename T::tag type;
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};
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template<
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typename BOOST_MPL_AUX_NA_PARAM(N)
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>
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struct negate
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#if !defined(BOOST_MPL_CFG_MSVC_ETI_BUG)
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: negate_impl<
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typename negate_tag<N>::type
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>::template apply<N>::type
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#else
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: aux::msvc_eti_base< typename apply_wrap1<
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negate_impl< typename negate_tag<N>::type >
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, N
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>::type >::type
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#endif
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{
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BOOST_MPL_AUX_LAMBDA_SUPPORT(1, negate, (N))
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};
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BOOST_MPL_AUX_NA_SPEC(1, negate)
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#if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC)
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namespace aux {
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template< typename T, T n > struct negate_wknd
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{
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BOOST_STATIC_CONSTANT(T, value = -n);
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typedef integral_c<T,value> type;
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};
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}
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#endif
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template<>
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struct negate_impl<integral_c_tag>
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{
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#if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC)
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template< typename N > struct apply
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: aux::negate_wknd< typename N::value_type, N::value >
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#else
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template< typename N > struct apply
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: integral_c< typename N::value_type, (-N::value) >
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#endif
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{
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};
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};
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}}
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#endif // BOOST_MPL_NEGATE_HPP_INCLUDED
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