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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)
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/mpl/if.hpp>
22 #include <boost/mpl/int.hpp>
23 #include <cstddef>
24 
25 //////////////////////////////////////////////////////////////////////////////
26 // missing partial specialization  workaround.
27 //////////////////////////////////////////////////////////////////////////////
28 
29 namespace boost
30 {
31     namespace range_detail
32     {
33         // 1 = std containers
34         // 2 = std::pair
35         // 3 = const std::pair
36         // 4 = array
37         // 5 = const array
38         // 6 = char array
39         // 7 = wchar_t array
40         // 8 = char*
41         // 9 = const char*
42         // 10 = whar_t*
43         // 11 = const wchar_t*
44         // 12 = string
45 
46         typedef mpl::int_<1>::type    std_container_;
47         typedef mpl::int_<2>::type    std_pair_;
48         typedef mpl::int_<3>::type    const_std_pair_;
49         typedef mpl::int_<4>::type    array_;
50         typedef mpl::int_<5>::type    const_array_;
51         typedef mpl::int_<6>::type    char_array_;
52         typedef mpl::int_<7>::type    wchar_t_array_;
53         typedef mpl::int_<8>::type    char_ptr_;
54         typedef mpl::int_<9>::type    const_char_ptr_;
55         typedef mpl::int_<10>::type   wchar_t_ptr_;
56         typedef mpl::int_<11>::type   const_wchar_t_ptr_;
57         typedef mpl::int_<12>::type   string_;
58 
59         template< typename C >
60         struct range_helper
61         {
62             static C* c;
63             static C  ptr;
64 
65             BOOST_STATIC_CONSTANT( bool, is_pair_                = sizeof( boost::range_detail::is_pair_impl( c ) ) == sizeof( yes_type ) );
66             BOOST_STATIC_CONSTANT( bool, is_char_ptr_            = sizeof( boost::range_detail::is_char_ptr_impl( ptr ) ) == sizeof( yes_type ) );
67             BOOST_STATIC_CONSTANT( bool, is_const_char_ptr_      = sizeof( boost::range_detail::is_const_char_ptr_impl( ptr ) ) == sizeof( yes_type ) );
68             BOOST_STATIC_CONSTANT( bool, is_wchar_t_ptr_         = sizeof( boost::range_detail::is_wchar_t_ptr_impl( ptr ) ) == sizeof( yes_type ) );
69             BOOST_STATIC_CONSTANT( bool, is_const_wchar_t_ptr_   = sizeof( boost::range_detail::is_const_wchar_t_ptr_impl( ptr ) ) == sizeof( yes_type ) );
70             BOOST_STATIC_CONSTANT( bool, is_char_array_          = sizeof( boost::range_detail::is_char_array_impl( ptr ) ) == sizeof( yes_type ) );
71             BOOST_STATIC_CONSTANT( bool, is_wchar_t_array_       = sizeof( boost::range_detail::is_wchar_t_array_impl( ptr ) ) == sizeof( yes_type ) );
72             BOOST_STATIC_CONSTANT( bool, is_string_              = (is_const_char_ptr_ || is_const_wchar_t_ptr_));
73             BOOST_STATIC_CONSTANT( bool, is_array_               = boost::is_array<C>::value );
74 
75         };
76 
77         template< typename C >
78         class range
79         {
80             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_pair_,
81                                                                   boost::range_detail::std_pair_,
82                                                                   void >::type pair_t;
83             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_array_,
84                                                                     boost::range_detail::array_,
85                                                                     pair_t >::type array_t;
86             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_string_,
87                                                                     boost::range_detail::string_,
88                                                                     array_t >::type string_t;
89             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_const_char_ptr_,
90                                                                     boost::range_detail::const_char_ptr_,
91                                                                     string_t >::type const_char_ptr_t;
92             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_char_ptr_,
93                                                                     boost::range_detail::char_ptr_,
94                                                                     const_char_ptr_t >::type char_ptr_t;
95             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_const_wchar_t_ptr_,
96                                                                     boost::range_detail::const_wchar_t_ptr_,
97                                                                     char_ptr_t >::type const_wchar_ptr_t;
98             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_wchar_t_ptr_,
99                                                                     boost::range_detail::wchar_t_ptr_,
100                                                                     const_wchar_ptr_t >::type wchar_ptr_t;
101             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_wchar_t_array_,
102                                                                     boost::range_detail::wchar_t_array_,
103                                                                     wchar_ptr_t >::type wchar_array_t;
104             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::range_detail::range_helper<C>::is_char_array_,
105                                                                     boost::range_detail::char_array_,
106                                                                     wchar_array_t >::type char_array_t;
107         public:
108             typedef BOOST_RANGE_DEDUCED_TYPENAME   boost::mpl::if_c< ::boost::is_void<char_array_t>::value,
109                                                                     boost::range_detail::std_container_,
110                                                                     char_array_t >::type type;
111         }; // class 'range'
112     }
113 }
114 
115 #endif
116 
117