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      1 
      2 #ifndef BOOST_MPL_NEGATE_HPP_INCLUDED
      3 #define BOOST_MPL_NEGATE_HPP_INCLUDED
      4 
      5 // Copyright Aleksey Gurtovoy 2000-2004
      6 //
      7 // Distributed under the Boost Software License, Version 1.0.
      8 // (See accompanying file LICENSE_1_0.txt or copy at
      9 // http://www.boost.org/LICENSE_1_0.txt)
     10 //
     11 // See http://www.boost.org/libs/mpl for documentation.
     12 
     13 // $Id: negate.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
     14 // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
     15 // $Revision: 49267 $
     16 
     17 #include <boost/mpl/integral_c.hpp>
     18 #include <boost/mpl/aux_/msvc_eti_base.hpp>
     19 #include <boost/mpl/aux_/na_spec.hpp>
     20 #include <boost/mpl/aux_/lambda_support.hpp>
     21 #include <boost/mpl/aux_/config/eti.hpp>
     22 #include <boost/mpl/aux_/config/integral.hpp>
     23 #include <boost/mpl/aux_/config/static_constant.hpp>
     24 
     25 namespace boost { namespace mpl {
     26 
     27 template< typename Tag > struct negate_impl;
     28 
     29 template< typename T > struct negate_tag
     30 {
     31     typedef typename T::tag type;
     32 };
     33 
     34 template<
     35       typename BOOST_MPL_AUX_NA_PARAM(N)
     36     >
     37 struct negate
     38 #if !defined(BOOST_MPL_CFG_MSVC_ETI_BUG)
     39     : negate_impl<
     40           typename negate_tag<N>::type
     41         >::template apply<N>::type
     42 #else
     43     : aux::msvc_eti_base< typename apply_wrap1<
     44           negate_impl< typename negate_tag<N>::type >
     45         , N
     46         >::type >::type
     47 #endif
     48 {
     49     BOOST_MPL_AUX_LAMBDA_SUPPORT(1, negate, (N))
     50 };
     51 
     52 BOOST_MPL_AUX_NA_SPEC(1, negate)
     53 
     54 
     55 #if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC)
     56 namespace aux {
     57 template< typename T, T n > struct negate_wknd
     58 {
     59     BOOST_STATIC_CONSTANT(T, value = -n);
     60     typedef integral_c<T,value> type;
     61 };
     62 }
     63 #endif
     64 
     65 template<>
     66 struct negate_impl<integral_c_tag>
     67 {
     68 #if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC)
     69     template< typename N > struct apply
     70         : aux::negate_wknd< typename N::value_type, N::value >
     71 #else
     72     template< typename N > struct apply
     73         : integral_c< typename N::value_type, (-N::value) >
     74 #endif
     75     {
     76     };
     77 };
     78 
     79 }}
     80 
     81 #endif // BOOST_MPL_NEGATE_HPP_INCLUDED
     82