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1 ////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright Vicente J. Botet Escriba 2010
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4 //
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5 // Distributed under the Boost Software License, Version 1.0.
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6 // (See accompanying file LICENSE_1_0.txt or copy at
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7 // http://www.boost.org/LICENSE_1_0.txt)
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8 //
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9 // See http://www.boost.org/libs/mpl for documentation.
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10 //
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11 ////////////////////////////////////////////////////////////////////
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12 #ifndef BOOST_MPL_SIGN_HPP_INCLUDED
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13 #define BOOST_MPL_SIGN_HPP_INCLUDED
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14
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15 #include <boost/mpl/integral_c.hpp>
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16 #include <boost/mpl/aux_/na_spec.hpp>
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17 #include <boost/mpl/aux_/lambda_support.hpp>
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18 #include <boost/mpl/aux_/config/integral.hpp>
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19 #include <boost/mpl/aux_/config/static_constant.hpp>
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20
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21 #if !defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2) \
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22 && !defined(BOOST_MPL_PREPROCESSING_MODE) \
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23 && !defined(__CUDACC__) \
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24 && ( defined(BOOST_MSVC) \
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25 || BOOST_WORKAROUND(__EDG_VERSION__, <= 238) \
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26 )
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27
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28 # define BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2
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29
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30 #endif
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31
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32 namespace boost { namespace mpl {
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33
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34 template< typename Tag > struct sign_impl;
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35
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36 template< typename T > struct sign_tag
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37 {
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38 typedef typename T::tag type;
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39 };
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40
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41 template<
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42 typename BOOST_MPL_AUX_NA_PARAM(N)
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43 >
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44 struct sign
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45 : sign_impl<
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46 typename sign_tag<N>::type
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47 >::template apply<N>::type
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48 {
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49 BOOST_MPL_AUX_LAMBDA_SUPPORT(1, sign, (N))
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50 };
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51
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52 BOOST_MPL_AUX_NA_SPEC(1, sign)
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53
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54 template<
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55 typename T
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56 , T n1
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57 >
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58 struct sign_c
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59 : sign<integral_c<T,n1> >
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60 {
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61 };
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62
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63 #if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2)
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64 namespace aux {
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65 template< typename T, T n > struct sign_wknd
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66 {
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67 BOOST_STATIC_CONSTANT(T, value = (n == 0 ? 0 : (n < 0 ? -1 : 1)));
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68 typedef integral_c<T,value> type;
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69 };
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70 }
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71 #endif
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72
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73 template<>
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74 struct sign_impl<integral_c_tag>
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75 {
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76 #if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2)
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77 template< typename N > struct apply
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78 : aux::sign_wknd< typename N::value_type, N::value >
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79 #else
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80 template< typename N > struct apply
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81 : integral_c< typename N::value_type, (N::value == 0 ? 0 : (N::value < 0 ? -1 : 1)) >
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82 #endif
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83 {
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84 };
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85 };
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86
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87 }}
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88
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89 #endif // BOOST_MPL_SIGN_HPP_INCLUDED
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