ceph/src/boost/libs/numeric/conversion/include/boost/numeric/conversion/detail/int_float_mixture.hpp

   1 //  (c) Copyright Fernando Luis Cacciola Carballal 2000-2004
   2 //  Use, modification, and distribution is subject to the Boost Software
   3 //  License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   4 //  http://www.boost.org/LICENSE_1_0.txt)
   5
   6 //  See library home page at http://www.boost.org/libs/numeric/conversion
   7 //
   8 // Contact the author at: fernando_cacciola@hotmail.com
   9 //
  10 #ifndef BOOST_NUMERIC_CONVERSION_DETAIL_INT_FLOAT_MIXTURE_FLC_12NOV2002_HPP
  11 #define BOOST_NUMERIC_CONVERSION_DETAIL_INT_FLOAT_MIXTURE_FLC_12NOV2002_HPP
  12
  13 #include "boost/config.hpp"
  14 #include "boost/limits.hpp"
  15
  16 #include "boost/numeric/conversion/int_float_mixture_enum.hpp"
  17 #include "boost/numeric/conversion/detail/meta.hpp"
  18
  19 #include "boost/mpl/integral_c.hpp"
  20
  21 namespace boost { namespace numeric { namespace convdetail
  22 {
  23   // Integral Constants for 'IntFloatMixture'
  24   typedef mpl::integral_c<int_float_mixture_enum, integral_to_integral> int2int_c ;
  25   typedef mpl::integral_c<int_float_mixture_enum, integral_to_float>    int2float_c ;
  26   typedef mpl::integral_c<int_float_mixture_enum, float_to_integral>    float2int_c ;
  27   typedef mpl::integral_c<int_float_mixture_enum, float_to_float>       float2float_c ;
  28
  29   // Metafunction:
  30   //
  31   //   get_int_float_mixture<T,S>::type
  32   //
  33   // Selects the appropriate Int-Float Mixture Integral Constant for the combination T,S.
  34   //
  35   template<class T,class S>
  36   struct get_int_float_mixture
  37   {
  38     typedef mpl::bool_< ::std::numeric_limits<S>::is_integer > S_int ;
  39     typedef mpl::bool_< ::std::numeric_limits<T>::is_integer > T_int ;
  40
  41     typedef typename
  42       for_both<S_int, T_int, int2int_c, int2float_c, float2int_c, float2float_c>::type
  43         type ;
  44   } ;
  45
  46   // Metafunction:
  47   //
  48   //   for_int_float_mixture<Mixture,int_int,int_float,float_int,float_float>::type
  49   //
  50   // {Mixture} is one of the Integral Constants for Mixture, declared above.
  51   // {int_int,int_float,float_int,float_float} are aribtrary types. (not metafunctions)
  52   //
  53   // According to the value of 'IntFloatMixture', selects the corresponding type.
  54   //
  55   template<class IntFloatMixture, class Int2Int, class Int2Float, class Float2Int, class Float2Float>
  56   struct for_int_float_mixture
  57   {
  58     typedef typename
  59       ct_switch4<IntFloatMixture
  60                  ,int2int_c, int2float_c, float2int_c  // default
  61                  ,Int2Int  , Int2Float  , Float2Int  , Float2Float
  62                 >::type
  63         type ;
  64   } ;
  65
  66 } } } // namespace boost::numeric::convdetail
  67
  68 #endif
  69 //
  70 ///////////////////////////////////////////////////////////////////////////////////////////////
  71
  72