boost/range/detail/common.hpp

   1 // Boost.Range library
   2 //
   3 //  Copyright Thorsten Ottosen 2003-2004. Use, modification and
   4 //  distribution is subject to the Boost Software License, Version
   5 //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6 //  http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8 // For more information, see http://www.boost.org/libs/range/
   9 //
  10
  11 #ifndef BOOST_RANGE_DETAIL_COMMON_HPP
  12 #define BOOST_RANGE_DETAIL_COMMON_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif
  17
  18 #include <boost/range/config.hpp>
  19 #include <boost/range/detail/sfinae.hpp>
  20 #include <boost/type_traits/is_void.hpp>
  21 #include <boost/type_traits/detail/ice_or.hpp>
  22 #include <boost/mpl/if.hpp>
  23 #include <boost/mpl/int.hpp>
  24 #include <cstddef>
  25
  26 //////////////////////////////////////////////////////////////////////////////
  27 // missing partial specialization  workaround.
  28 //////////////////////////////////////////////////////////////////////////////
  29
  30 namespace boost
  31 {
  32     namespace range_detail
  33     {
  34         // 1 = std containers
  35         // 2 = std::pair
  36         // 3 = const std::pair
  37         // 4 = array
  38         // 5 = const array
  39         // 6 = char array
  40         // 7 = wchar_t array
  41         // 8 = char*
  42         // 9 = const char*
  43         // 10 = whar_t*
  44         // 11 = const wchar_t*
  45         // 12 = string
  46
  47         typedef mpl::int_<1>::type    std_container_;
  48         typedef mpl::int_<2>::type    std_pair_;
  49         typedef mpl::int_<3>::type    const_std_pair_;
  50         typedef mpl::int_<4>::type    array_;
  51         typedef mpl::int_<5>::type    const_array_;
  52         typedef mpl::int_<6>::type    char_array_;
  53         typedef mpl::int_<7>::type    wchar_t_array_;
  54         typedef mpl::int_<8>::type    char_ptr_;
  55         typedef mpl::int_<9>::type    const_char_ptr_;
  56         typedef mpl::int_<10>::type   wchar_t_ptr_;
  57         typedef mpl::int_<11>::type   const_wchar_t_ptr_;
  58         typedef mpl::int_<12>::type   string_;
  59
  60         template< typename C >
  61         struct range_helper
  62         {
  63             static C* c;
  64             static C  ptr;
  65
  66             BOOST_STATIC_CONSTANT( bool, is_pair_                = sizeof( boost::range_detail::is_pair_impl( c ) ) == sizeof( yes_type ) );
  67             BOOST_STATIC_CONSTANT( bool, is_char_ptr_            = sizeof( boost::range_detail::is_char_ptr_impl( ptr ) ) == sizeof( yes_type ) );
  68             BOOST_STATIC_CONSTANT( bool, is_const_char_ptr_      = sizeof( boost::range_detail::is_const_char_ptr_impl( ptr ) ) == sizeof( yes_type ) );
  69             BOOST_STATIC_CONSTANT( bool, is_wchar_t_ptr_         = sizeof( boost::range_detail::is_wchar_t_ptr_impl( ptr ) ) == sizeof( yes_type ) );
  70             BOOST_STATIC_CONSTANT( bool, is_const_wchar_t_ptr_   = sizeof( boost::range_detail::is_const_wchar_t_ptr_impl( ptr ) ) == sizeof( yes_type ) );
  71             BOOST_STATIC_CONSTANT( bool, is_char_array_          = sizeof( boost::range_detail::is_char_array_impl( ptr ) ) == sizeof( yes_type ) );
  72             BOOST_STATIC_CONSTANT( bool, is_wchar_t_array_       = sizeof( boost::range_detail::is_wchar_t_array_impl( ptr ) ) == sizeof( yes_type ) );
  73             BOOST_STATIC_CONSTANT( bool, is_string_              = (boost::type_traits::ice_or<is_const_char_ptr_, is_const_wchar_t_ptr_>::value ));
  74             BOOST_STATIC_CONSTANT( bool, is_array_               = boost::is_array<C>::value );
  75
  76         };
  77
  78         template< typename C >
  79         class range
  80         {
  81             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_pair_,
  82                                                                   boost::range_detail::std_pair_,
  83                                                                   void >::type pair_t;
  84             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_array_,
  85                                                                     boost::range_detail::array_,
  86                                                                     pair_t >::type array_t;
  87             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_string_,
  88                                                                     boost::range_detail::string_,
  89                                                                     array_t >::type string_t;
  90             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_const_char_ptr_,
  91                                                                     boost::range_detail::const_char_ptr_,
  92                                                                     string_t >::type const_char_ptr_t;
  93             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_char_ptr_,
  94                                                                     boost::range_detail::char_ptr_,
  95                                                                     const_char_ptr_t >::type char_ptr_t;
  96             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_const_wchar_t_ptr_,
  97                                                                     boost::range_detail::const_wchar_t_ptr_,
  98                                                                     char_ptr_t >::type const_wchar_ptr_t;
  99             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_wchar_t_ptr_,
 100                                                                     boost::range_detail::wchar_t_ptr_,
 101                                                                     const_wchar_ptr_t >::type wchar_ptr_t;
 102             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_wchar_t_array_,
 103                                                                     boost::range_detail::wchar_t_array_,
 104                                                                     wchar_ptr_t >::type wchar_array_t;
 105             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_char_array_,
 106                                                                     boost::range_detail::char_array_,
 107                                                                     wchar_array_t >::type char_array_t;
 108         public:
 109             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::is_void<char_array_t>::value,
 110                                                                     boost::range_detail::std_container_,
 111                                                                     char_array_t >::type type;
 112         }; // class 'range'
 113     }
 114 }
 115
 116 #endif
 117