1 //  (C) Copyright Gennadiy Rozental 2004-2008.
2 //  Distributed under the Boost Software License, Version 1.0.
3 //  (See accompanying file LICENSE_1_0.txt or copy at
4 //  http://www.boost.org/LICENSE_1_0.txt)
5 
6 //  See http://www.boost.org/libs/test for the library home page.
7 //
8 //  File        : $RCSfile$
9 //
10 //  Version     : $Revision: 49312 $
11 //
12 //  Description : generic char traits class; wraps std::char_traits
13 // ***************************************************************************
14 
15 #ifndef BOOST_TEST_BCS_CHAR_TRAITS_HPP_071894GER
16 #define BOOST_TEST_BCS_CHAR_TRAITS_HPP_071894GER
17 
18 // Boost
19 #include <boost/config.hpp>
20 #include <boost/detail/workaround.hpp>
21 #include <boost/test/detail/config.hpp>
22 #include <boost/type_traits/add_const.hpp>
23 
24 // STL
25 #include <string>                       // std::char_traits
26 #include <cstddef>                      // std::size_t
27 
28 #include <boost/test/detail/suppress_warnings.hpp>
29 
30 //____________________________________________________________________________//
31 
32 namespace boost {
33 
34 namespace unit_test {
35 
36 namespace ut_detail {
37 
38 template<typename CharT> struct bcs_base_char           { typedef CharT type; };
39 
40 template<> struct bcs_base_char<char const>             { typedef char type; };
41 template<> struct bcs_base_char<unsigned char>          { typedef char type; };
42 #if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
43 template<> struct bcs_base_char<unsigned char const>    { typedef char type; };
44 #endif
45 
46 template<> struct bcs_base_char<wchar_t const>          { typedef wchar_t type; };
47 
48 // ************************************************************************** //
49 // **************               bcs_char_traits                ************** //
50 // ************************************************************************** //
51 
52 template<typename CharT>
53 struct bcs_char_traits_impl
54 {
55 #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
56     typedef CharT const const_char;
57 #else
58     typedef typename boost::add_const<CharT>::type const_char;
59 #endif
eqboost::unit_test::ut_detail::bcs_char_traits_impl60     static bool eq( CharT c1, CharT c2 )
61     {
62         return c1 == c2;
63     }
ltboost::unit_test::ut_detail::bcs_char_traits_impl64     static bool lt( CharT c1, CharT c2 )
65     {
66         return c1 < c2;
67     }
68 
compareboost::unit_test::ut_detail::bcs_char_traits_impl69     static int compare( const_char* cstr1, const_char* cstr2, std::size_t n )
70     {
71         while( n > 0 ) {
72             if( !eq( *cstr1, *cstr2 ) )
73                 return lt( *cstr1, *cstr2 ) ? -1 : 1;
74             ++cstr1;
75             ++cstr2;
76             --n;
77         }
78 
79         return 0;
80     }
81 
lengthboost::unit_test::ut_detail::bcs_char_traits_impl82     static std::size_t length( const_char* cstr )
83     {
84         const_char null_char = CharT();
85 
86         const_char* ptr = cstr;
87         while( !eq( *ptr, null_char ) )
88             ++ptr;
89 
90         return ptr - cstr;
91     }
92 
findboost::unit_test::ut_detail::bcs_char_traits_impl93     static const_char* find( const_char* s, std::size_t n, CharT c )
94     {
95         while( n > 0 ) {
96             if( eq( *s, c ) )
97                 return s;
98 
99             ++s;
100             --n;
101         }
102         return 0;
103     }
104 };
105 
106 #ifdef BOOST_CLASSIC_IOSTREAMS
107 template<typename CharT>
108 struct char_traits_with_find : std::string_char_traits<CharT> {
findboost::unit_test::ut_detail::char_traits_with_find109     static CharT const* find( CharT const* s, std::size_t n, CharT c )
110     {
111         while( n > 0 ) {
112             if( eq( *s, c ) )
113                 return s;
114 
115             ++s;
116             --n;
117         }
118         return 0;
119     }
120 };
121 
122 template<> struct bcs_char_traits_impl<char> : char_traits_with_find<char> {};
123 template<> struct bcs_char_traits_impl<wchar_t> : char_traits_with_find<wchar_t> {};
124 #else
125 template<> struct bcs_char_traits_impl<char> : std::char_traits<char> {};
126 template<> struct bcs_char_traits_impl<wchar_t> : std::char_traits<wchar_t> {};
127 #endif
128 
129 template<typename CharT>
130 class bcs_char_traits : public bcs_char_traits_impl<CharT> {
131     typedef typename ut_detail::bcs_base_char<CharT>::type                              the_base_char;
132 public:
133 #ifdef BOOST_CLASSIC_IOSTREAMS
134     typedef std::basic_string<the_base_char, std::string_char_traits<the_base_char> >   std_string;
135 #else
136     typedef std::basic_string<the_base_char, std::char_traits<the_base_char> >          std_string;
137 #endif
138 };
139 
140 } // namespace ut_detail
141 
142 } // namespace unit_test
143 
144 } // namespace boost
145 
146 //____________________________________________________________________________//
147 
148 #include <boost/test/detail/enable_warnings.hpp>
149 
150 #endif // BOOST_TEST_BCS_CHAR_TRAITS_HPP_071894GER
151