range/detail/common.hpp

0001 // Boost.Range library
0002 //
0003 //  Copyright Thorsten Ottosen 2003-2004. Use, modification and
0004 //  distribution is subject to the Boost Software License, Version
0005 //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
0006 //  http://www.boost.org/LICENSE_1_0.txt)
0007 //
0008 // For more information, see http://www.boost.org/libs/range/
0009 //
0010
0011 #ifndef BOOST_RANGE_DETAIL_COMMON_HPP
0012 #define BOOST_RANGE_DETAIL_COMMON_HPP
0013
0014 #if defined(_MSC_VER)
0015 # pragma once
0016 #endif
0017
0018 #include <boost/range/config.hpp>
0019 #include <boost/range/detail/sfinae.hpp>
0020 #include <boost/type_traits/is_void.hpp>
0021 #include <boost/mpl/if.hpp>
0022 #include <boost/mpl/int.hpp>
0023 #include <cstddef>
0024
0025 //////////////////////////////////////////////////////////////////////////////
0026 // missing partial specialization  workaround.
0027 //////////////////////////////////////////////////////////////////////////////
0028
0029 namespace boost
0030 {
0031     namespace range_detail
0032     {
0033         // 1 = std containers
0034         // 2 = std::pair
0035         // 3 = const std::pair
0036         // 4 = array
0037         // 5 = const array
0038         // 6 = char array
0039         // 7 = wchar_t array
0040         // 8 = char*
0041         // 9 = const char*
0042         // 10 = whar_t*
0043         // 11 = const wchar_t*
0044         // 12 = string
0045
0046         typedef mpl::int_<1>::type    std_container_;
0047         typedef mpl::int_<2>::type    std_pair_;
0048         typedef mpl::int_<3>::type    const_std_pair_;
0049         typedef mpl::int_<4>::type    array_;
0050         typedef mpl::int_<5>::type    const_array_;
0051         typedef mpl::int_<6>::type    char_array_;
0052         typedef mpl::int_<7>::type    wchar_t_array_;
0053         typedef mpl::int_<8>::type    char_ptr_;
0054         typedef mpl::int_<9>::type    const_char_ptr_;
0055         typedef mpl::int_<10>::type   wchar_t_ptr_;
0056         typedef mpl::int_<11>::type   const_wchar_t_ptr_;
0057         typedef mpl::int_<12>::type   string_;
0058
0059         template< typename C >
0060         struct range_helper
0061         {
0062             static C* c;
0063             static C  ptr;
0064
0065             BOOST_STATIC_CONSTANT( bool, is_pair_                = sizeof( boost::range_detail::is_pair_impl( c ) ) == sizeof( yes_type ) );
0066             BOOST_STATIC_CONSTANT( bool, is_char_ptr_            = sizeof( boost::range_detail::is_char_ptr_impl( ptr ) ) == sizeof( yes_type ) );
0067             BOOST_STATIC_CONSTANT( bool, is_const_char_ptr_      = sizeof( boost::range_detail::is_const_char_ptr_impl( ptr ) ) == sizeof( yes_type ) );
0068             BOOST_STATIC_CONSTANT( bool, is_wchar_t_ptr_         = sizeof( boost::range_detail::is_wchar_t_ptr_impl( ptr ) ) == sizeof( yes_type ) );
0069             BOOST_STATIC_CONSTANT( bool, is_const_wchar_t_ptr_   = sizeof( boost::range_detail::is_const_wchar_t_ptr_impl( ptr ) ) == sizeof( yes_type ) );
0070             BOOST_STATIC_CONSTANT( bool, is_char_array_          = sizeof( boost::range_detail::is_char_array_impl( ptr ) ) == sizeof( yes_type ) );
0071             BOOST_STATIC_CONSTANT( bool, is_wchar_t_array_       = sizeof( boost::range_detail::is_wchar_t_array_impl( ptr ) ) == sizeof( yes_type ) );
0072             BOOST_STATIC_CONSTANT( bool, is_string_              = (is_const_char_ptr_ || is_const_wchar_t_ptr_));
0073             BOOST_STATIC_CONSTANT( bool, is_array_               = boost::is_array<C>::value );
0074
0075         };
0076
0077         template< typename C >
0078         class range
0079         {
0080             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_pair_,
0081                                                                   boost::range_detail::std_pair_,
0082                                                                   void >::type pair_t;
0083             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_array_,
0084                                                                     boost::range_detail::array_,
0085                                                                     pair_t >::type array_t;
0086             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_string_,
0087                                                                     boost::range_detail::string_,
0088                                                                     array_t >::type string_t;
0089             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_const_char_ptr_,
0090                                                                     boost::range_detail::const_char_ptr_,
0091                                                                     string_t >::type const_char_ptr_t;
0092             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_char_ptr_,
0093                                                                     boost::range_detail::char_ptr_,
0094                                                                     const_char_ptr_t >::type char_ptr_t;
0095             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_const_wchar_t_ptr_,
0096                                                                     boost::range_detail::const_wchar_t_ptr_,
0097                                                                     char_ptr_t >::type const_wchar_ptr_t;
0098             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_wchar_t_ptr_,
0099                                                                     boost::range_detail::wchar_t_ptr_,
0100                                                                     const_wchar_ptr_t >::type wchar_ptr_t;
0101             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_wchar_t_array_,
0102                                                                     boost::range_detail::wchar_t_array_,
0103                                                                     wchar_ptr_t >::type wchar_array_t;
0104             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_char_array_,
0105                                                                     boost::range_detail::char_array_,
0106                                                                     wchar_array_t >::type char_array_t;
0107         public:
0108             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::is_void<char_array_t>::value,
0109                                                                     boost::range_detail::std_container_,
0110                                                                     char_array_t >::type type;
0111         }; // class 'range'
0112     }
0113 }
0114
0115 #endif
0116