ceph/src/boost/boost/test/utils/is_cstring.hpp

   1 //  (C) Copyright Gennadiy Rozental 2001.
   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     : $Revision$
  11 //
  12 //  Description : defines the is_cstring type trait
  13 // ***************************************************************************
  14
  15 #ifndef BOOST_TEST_UTILS_IS_CSTRING_HPP
  16 #define BOOST_TEST_UTILS_IS_CSTRING_HPP
  17
  18 // Boost
  19 #include <boost/mpl/bool.hpp>
  20 #include <boost/type_traits/is_same.hpp>
  21 #include <boost/type_traits/decay.hpp>
  22 #include <boost/type_traits/remove_pointer.hpp>
  23 #include <boost/type_traits/remove_const.hpp>
  24 #include <boost/type_traits/add_const.hpp>
  25
  26 #include <boost/test/utils/basic_cstring/basic_cstring_fwd.hpp>
  27 #include <string>
  28
  29 //____________________________________________________________________________//
  30
  31 namespace boost {
  32 namespace unit_test {
  33
  34 // ************************************************************************** //
  35 // **************                  is_cstring                  ************** //
  36 // ************************************************************************** //
  37
  38 namespace ut_detail {
  39
  40 template<typename T>
  41 struct is_cstring_impl : public mpl::false_ {};
  42
  43 template<typename T>
  44 struct is_cstring_impl<T const*> : public is_cstring_impl<T*> {};
  45
  46 template<typename T>
  47 struct is_cstring_impl<T const* const> : public is_cstring_impl<T*> {};
  48
  49 template<>
  50 struct is_cstring_impl<char*> : public mpl::true_ {};
  51
  52 template<>
  53 struct is_cstring_impl<wchar_t*> : public mpl::true_ {};
  54
  55 template <typename T, bool is_cstring = is_cstring_impl<typename boost::decay<T>::type>::value >
  56 struct deduce_cstring_impl;
  57
  58 template <typename T, bool is_cstring >
  59 struct deduce_cstring_impl<T&, is_cstring> : public deduce_cstring_impl<T, is_cstring>{};
  60
  61 template <typename T, bool is_cstring >
  62 struct deduce_cstring_impl<T const, is_cstring> : public deduce_cstring_impl<T, is_cstring>{};
  63
  64 template <typename T>
  65 struct deduce_cstring_impl<T, true> {
  66     typedef typename boost::add_const<
  67         typename boost::remove_pointer<
  68             typename boost::decay<T>::type
  69         >::type
  70     >::type U;
  71     typedef boost::unit_test::basic_cstring<U> type;
  72 };
  73
  74 template <typename T>
  75 struct deduce_cstring_impl< T, false > {
  76     typedef typename
  77         boost::remove_const<
  78             typename boost::remove_reference<T>::type
  79         >::type type;
  80 };
  81
  82 template <typename T>
  83 struct deduce_cstring_impl< std::basic_string<T, std::char_traits<T> >, false > {
  84     typedef boost::unit_test::basic_cstring<typename boost::add_const<T>::type> type;
  85 };
  86
  87 } // namespace ut_detail
  88
  89 template<typename T>
  90 struct is_cstring : public ut_detail::is_cstring_impl<typename decay<T>::type> {};
  91
  92 template<typename T, bool is_cstring = is_cstring<typename boost::decay<T>::type>::value >
  93 struct is_cstring_comparable: public mpl::false_ {};
  94
  95 template<typename T>
  96 struct is_cstring_comparable< T, true > : public mpl::true_ {};
  97
  98 template<typename T>
  99 struct is_cstring_comparable< std::basic_string<T, std::char_traits<T> >, false > : public mpl::true_ {};
 100
 101 template<typename T>
 102 struct is_cstring_comparable< boost::unit_test::basic_cstring<T>, false > : public mpl::true_ {};
 103
 104 template <class T>
 105 struct deduce_cstring {
 106     typedef typename
 107         boost::remove_const<
 108             typename boost::remove_reference<T>::type
 109         >::type U;
 110     typedef typename ut_detail::deduce_cstring_impl<typename boost::decay<U>::type>::type type;
 111 };
 112
 113 } // namespace unit_test
 114 } // namespace boost
 115
 116 #endif // BOOST_TEST_UTILS_IS_CSTRING_HPP