2 #ifndef BOOST_MPL_NEGATE_HPP_INCLUDED
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3 #define BOOST_MPL_NEGATE_HPP_INCLUDED
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5 // Copyright Aleksey Gurtovoy 2000-2004
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7 // Distributed under the Boost Software License, Version 1.0.
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8 // (See accompanying file LICENSE_1_0.txt or copy at
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9 // http://www.boost.org/LICENSE_1_0.txt)
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11 // See http://www.boost.org/libs/mpl for documentation.
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13 // $Id: negate.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
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14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
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15 // $Revision: 49267 $
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17 #include <boost/mpl/integral_c.hpp>
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18 #include <boost/mpl/aux_/msvc_eti_base.hpp>
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19 #include <boost/mpl/aux_/na_spec.hpp>
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20 #include <boost/mpl/aux_/lambda_support.hpp>
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21 #include <boost/mpl/aux_/config/eti.hpp>
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22 #include <boost/mpl/aux_/config/integral.hpp>
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23 #include <boost/mpl/aux_/config/static_constant.hpp>
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25 namespace boost { namespace mpl {
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27 template< typename Tag > struct negate_impl;
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29 template< typename T > struct negate_tag
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31 typedef typename T::tag type;
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35 typename BOOST_MPL_AUX_NA_PARAM(N)
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38 #if !defined(BOOST_MPL_CFG_MSVC_ETI_BUG)
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40 typename negate_tag<N>::type
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41 >::template apply<N>::type
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43 : aux::msvc_eti_base< typename apply_wrap1<
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44 negate_impl< typename negate_tag<N>::type >
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49 BOOST_MPL_AUX_LAMBDA_SUPPORT(1, negate, (N))
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52 BOOST_MPL_AUX_NA_SPEC(1, negate)
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55 #if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC)
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57 template< typename T, T n > struct negate_wknd
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59 BOOST_STATIC_CONSTANT(T, value = -n);
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60 typedef integral_c<T,value> type;
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66 struct negate_impl<integral_c_tag>
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68 #if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC)
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69 template< typename N > struct apply
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70 : aux::negate_wknd< typename N::value_type, N::value >
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72 template< typename N > struct apply
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73 : integral_c< typename N::value_type, (-N::value) >
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81 #endif // BOOST_MPL_NEGATE_HPP_INCLUDED
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