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  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_META_FLC_12NOV2002_HPP
  11. #define BOOST_NUMERIC_CONVERSION_DETAIL_META_FLC_12NOV2002_HPP
  12.  
  13. #include "boost/type_traits/remove_cv.hpp"
  14.  
  15. #include "boost/mpl/if.hpp"
  16. #include "boost/mpl/eval_if.hpp"
  17. #include "boost/mpl/equal_to.hpp"
  18. #include "boost/mpl/not.hpp"
  19. #include "boost/mpl/and.hpp"
  20. #include "boost/mpl/bool.hpp"
  21. #include "boost/mpl/identity.hpp"
  22.  
  23. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost { namespace numeric { namespace convdetail
  24. {
  25.    template< class T1, class T2>
  26.    struct equal_to
  27.    {
  28.    #if !defined(__BORLANDC__)
  29.    
  30.        enum { x = ( BOOST_MPL_AUX_VALUE_WKND(T1)::value == BOOST_MPL_AUX_VALUE_WKND(T2)::value ) };
  31.            
  32.        BOOST_STATIC_CONSTANT(bool, value = x);
  33.            
  34.        typedef mpl::bool_<value> type;
  35.        
  36.    #else
  37.    
  38.        BOOST_STATIC_CONSTANT(bool, value = (
  39.              BOOST_MPL_AUX_VALUE_WKND(T1)::value
  40.                == BOOST_MPL_AUX_VALUE_WKND(T2)::value
  41.            ));
  42.            
  43.        typedef mpl::bool_<(
  44.              BOOST_MPL_AUX_VALUE_WKND(T1)::value
  45.                == BOOST_MPL_AUX_VALUE_WKND(T2)::value
  46.            )> type;
  47.    #endif
  48.    };
  49.    
  50. // Metafunction:
  51.   //
  52.   //   ct_switch4<Value,Case0Val,Case1Val,Case2Val,Case0Type,Case1Type,Case2Type,DefaultType>::type
  53.   //
  54.   // {Value,Case(X)Val} are Integral Constants (such as: mpl::int_<>)
  55.   // {Case(X)Type,DefaultType} are arbitrary types. (not metafunctions)
  56.   //
  57.   // Returns Case(X)Type if Val==Case(X)Val; DefaultType otherwise.
  58.   //
  59.   template<class Value,
  60.            class Case0Val,
  61.            class Case1Val,
  62.            class Case2Val,
  63.            class Case0Type,
  64.            class Case1Type,
  65.            class Case2Type,
  66.            class DefaultType
  67.           >
  68.   struct ct_switch4
  69.   {
  70.     typedef mpl::identity<Case0Type> Case0TypeQ ;
  71.     typedef mpl::identity<Case1Type> Case1TypeQ ;
  72.  
  73.     typedef equal_to<Value,Case0Val> is_case0 ;
  74.     typedef equal_to<Value,Case1Val> is_case1 ;
  75.     typedef equal_to<Value,Case2Val> is_case2 ;
  76.  
  77.     typedef mpl::if_<is_case2,Case2Type,DefaultType> choose_2_3Q ;
  78.     typedef mpl::eval_if<is_case1,Case1TypeQ,choose_2_3Q> choose_1_2_3Q ;
  79.  
  80.     typedef typename
  81.       mpl::eval_if<is_case0,Case0TypeQ,choose_1_2_3Q>::type
  82.         type ;
  83.   } ;
  84.  
  85.  
  86.  
  87.  
  88.   // Metafunction:
  89.   //
  90.   //   for_both<expr0,expr1,TT,TF,FT,FF>::type
  91.   //
  92.   // {exp0,expr1} are Boolean Integral Constants
  93.   // {TT,TF,FT,FF} are aribtrary types. (not metafunctions)
  94.   //
  95.   // According to the combined boolean value of 'expr0 && expr1', selects the corresponding type.
  96.   //
  97.   template<class expr0, class expr1, class TT, class TF, class FT, class FF>
  98.   struct for_both
  99.   {
  100.     typedef mpl::identity<TF> TF_Q ;
  101.     typedef mpl::identity<TT> TT_Q ;
  102.  
  103.     typedef typename mpl::not_<expr0>::type not_expr0 ;
  104.     typedef typename mpl::not_<expr1>::type not_expr1 ;
  105.  
  106.     typedef typename mpl::and_<expr0,expr1>::type     caseTT ;
  107.     typedef typename mpl::and_<expr0,not_expr1>::type caseTF ;
  108.     typedef typename mpl::and_<not_expr0,expr1>::type caseFT ;
  109.  
  110.     typedef mpl::if_<caseFT,FT,FF>                    choose_FT_FF_Q ;
  111.     typedef mpl::eval_if<caseTF,TF_Q,choose_FT_FF_Q> choose_TF_FT_FF_Q ;
  112.  
  113.     typedef typename mpl::eval_if<caseTT,TT_Q,choose_TF_FT_FF_Q>::type type ;
  114.   } ;
  115.  
  116. } } } // namespace mars_boost::numeric::convdetail
  117.  
  118. #endif
  119.  
  120.  
  121.  
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