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1 ///////////////////////////////////////////////////////////////////////////////
2 // type_traits.hpp
3 //
4 // Copyright 2008 Eric Niebler. Distributed under the Boost
5 // Software License, Version 1.0. (See accompanying file
6 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7
8 #ifndef BOOST_XPRESSIVE_DETAIL_STATIC_TYPE_TRAITS_HPP_EAN_10_04_2005
9 #define BOOST_XPRESSIVE_DETAIL_STATIC_TYPE_TRAITS_HPP_EAN_10_04_2005
10
11 // MS compatible compilers support #pragma once
12 #if defined(_MSC_VER)
13 # pragma once
14 #endif
15
16 #include <string>
17 #include <boost/config.hpp>
18 #include <boost/mpl/bool.hpp>
19 #include <boost/iterator/iterator_traits.hpp>
20 #include <boost/type_traits/is_convertible.hpp>
21 #include <boost/xpressive/detail/detail_fwd.hpp>
22
23 namespace boost { namespace xpressive { namespace detail
24 {
25
26 ///////////////////////////////////////////////////////////////////////////////
27 // is_static_xpression
28 //
29 template<typename T>
30 struct is_static_xpression
31 : mpl::false_
32 {
33 };
34
35 template<typename Matcher, typename Next>
36 struct is_static_xpression<static_xpression<Matcher, Next> >
37 : mpl::true_
38 {
39 };
40
41 template<typename Top, typename Next>
42 struct is_static_xpression<stacked_xpression<Top, Next> >
43 : mpl::true_
44 {
45 };
46
47 //////////////////////////////////////////////////////////////////////////
48 // is_random
49 //
50 template<typename BidiIter>
51 struct is_random
52 : is_convertible
53 <
54 typename iterator_category<BidiIter>::type
55 , std::random_access_iterator_tag
56 >
57 {
58 };
59
60 //////////////////////////////////////////////////////////////////////////
61 // is_string_iterator
62 //
63 template<typename Iter>
64 struct is_string_iterator
65 : mpl::false_
66 {
67 };
68
69 template<>
70 struct is_string_iterator<std::string::iterator>
71 : mpl::true_
72 {
73 };
74
75 template<>
76 struct is_string_iterator<std::string::const_iterator>
77 : mpl::true_
78 {
79 };
80
81 #ifndef BOOST_NO_STD_WSTRING
82 template<>
83 struct is_string_iterator<std::wstring::iterator>
84 : mpl::true_
85 {
86 };
87
88 template<>
89 struct is_string_iterator<std::wstring::const_iterator>
90 : mpl::true_
91 {
92 };
93 #endif
94
95 ///////////////////////////////////////////////////////////////////////////////
96 // is_char
97 //
98 template<typename T>
99 struct is_char
100 : mpl::false_
101 {};
102
103 template<>
104 struct is_char<char>
105 : mpl::true_
106 {};
107
108 template<>
109 struct is_char<wchar_t>
110 : mpl::true_
111 {};
112
113 }}} // namespace boost::xpressive::detail
114
115 #endif