ceph/src/boost/libs/type_index/include/boost/type_index/stl_type_index.hpp

   1 //
   2 // Copyright (c) Antony Polukhin, 2013-2015.
   3 //
   4 //
   5 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   6 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8
   9 #ifndef BOOST_TYPE_INDEX_STL_TYPE_INDEX_HPP
  10 #define BOOST_TYPE_INDEX_STL_TYPE_INDEX_HPP
  11
  12 /// \file stl_type_index.hpp
  13 /// \brief Contains boost::typeindex::stl_type_index class.
  14 ///
  15 /// boost::typeindex::stl_type_index class can be used as a drop-in replacement
  16 /// for std::type_index.
  17 ///
  18 /// It is used in situations when RTTI is enabled or typeid() method is available.
  19 /// When typeid() is disabled or BOOST_TYPE_INDEX_FORCE_NO_RTTI_COMPATIBILITY macro
  20 /// is defined boost::typeindex::ctti is usually used instead of boost::typeindex::stl_type_index.
  21
  22 #include <boost/type_index/type_index_facade.hpp>
  23
  24 // MSVC is capable of calling typeid(T) even when RTTI is off
  25 #if defined(BOOST_NO_RTTI) && !defined(BOOST_MSVC)
  26 #error "File boost/type_index/stl_type_index.ipp is not usable when typeid() is not available."
  27 #endif
  28
  29 #include <typeinfo>
  30 #include <cstring>                                  // std::strcmp, std::strlen, std::strstr
  31 #include <stdexcept>
  32 #include <boost/static_assert.hpp>
  33 #include <boost/throw_exception.hpp>
  34 #include <boost/core/demangle.hpp>
  35 #include <boost/type_traits/is_const.hpp>
  36 #include <boost/type_traits/is_reference.hpp>
  37 #include <boost/type_traits/is_volatile.hpp>
  38 #include <boost/type_traits/remove_cv.hpp>
  39 #include <boost/type_traits/remove_reference.hpp>
  40 #include <boost/mpl/if.hpp>
  41 #include <boost/mpl/or.hpp>
  42
  43 #if (defined(__EDG_VERSION__) && __EDG_VERSION__ < 245) \
  44         || (defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 744)
  45 #   include <boost/type_traits/is_signed.hpp>
  46 #   include <boost/type_traits/make_signed.hpp>
  47 #   include <boost/mpl/identity.hpp>
  48 #endif
  49
  50 #ifdef BOOST_HAS_PRAGMA_ONCE
  51 # pragma once
  52 #endif
  53
  54 namespace boost { namespace typeindex {
  55
  56 /// \class stl_type_index
  57 /// This class is a wrapper around std::type_info, that workarounds issues and provides
  58 /// much more rich interface. \b For \b description \b of \b functions \b see type_index_facade.
  59 ///
  60 /// This class requires typeid() to work. For cases when RTTI is disabled see ctti_type_index.
  61 class stl_type_index
  62     : public type_index_facade<
  63         stl_type_index,
  64         #ifdef BOOST_NO_STD_TYPEINFO
  65             type_info
  66         #else
  67             std::type_info
  68         #endif
  69     >
  70 {
  71 public:
  72 #ifdef BOOST_NO_STD_TYPEINFO
  73     typedef type_info type_info_t;
  74 #else
  75     typedef std::type_info type_info_t;
  76 #endif
  77
  78 private:
  79     const type_info_t* data_;
  80
  81 public:
  82     inline stl_type_index() BOOST_NOEXCEPT
  83         : data_(&typeid(void))
  84     {}
  85
  86     inline stl_type_index(const type_info_t& data) BOOST_NOEXCEPT
  87         : data_(&data)
  88     {}
  89
  90     inline const type_info_t&  type_info() const BOOST_NOEXCEPT;
  91
  92     inline const char*  raw_name() const BOOST_NOEXCEPT;
  93     inline const char*  name() const BOOST_NOEXCEPT;
  94     inline std::string  pretty_name() const;
  95
  96     inline std::size_t  hash_code() const BOOST_NOEXCEPT;
  97     inline bool         equal(const stl_type_index& rhs) const BOOST_NOEXCEPT;
  98     inline bool         before(const stl_type_index& rhs) const BOOST_NOEXCEPT;
  99
 100     template <class T>
 101     inline static stl_type_index type_id() BOOST_NOEXCEPT;
 102
 103     template <class T>
 104     inline static stl_type_index type_id_with_cvr() BOOST_NOEXCEPT;
 105
 106     template <class T>
 107     inline static stl_type_index type_id_runtime(const T& value) BOOST_NOEXCEPT;
 108 };
 109
 110 inline const stl_type_index::type_info_t& stl_type_index::type_info() const BOOST_NOEXCEPT {
 111     return *data_;
 112 }
 113
 114
 115 inline const char* stl_type_index::raw_name() const BOOST_NOEXCEPT {
 116 #ifdef _MSC_VER
 117     return data_->raw_name();
 118 #else
 119     return data_->name();
 120 #endif
 121 }
 122
 123 inline const char* stl_type_index::name() const BOOST_NOEXCEPT {
 124     return data_->name();
 125 }
 126
 127 inline std::string stl_type_index::pretty_name() const {
 128     static const char cvr_saver_name[] = "boost::typeindex::detail::cvr_saver<";
 129     static BOOST_CONSTEXPR_OR_CONST std::string::size_type cvr_saver_name_len = sizeof(cvr_saver_name) - 1;
 130
 131     // In case of MSVC demangle() is a no-op, and name() already returns demangled name.
 132     // In case of GCC and Clang (on non-Windows systems) name() returns mangled name and demangle() undecorates it.
 133     const boost::core::scoped_demangled_name demangled_name(data_->name());
 134
 135     const char* begin = demangled_name.get();
 136     if (!begin) {
 137         boost::throw_exception(std::runtime_error("Type name demangling failed"));
 138     }
 139
 140     const std::string::size_type len = std::strlen(begin);
 141     const char* end = begin + len;
 142
 143     if (len > cvr_saver_name_len) {
 144         const char* b = std::strstr(begin, cvr_saver_name);
 145         if (b) {
 146             b += cvr_saver_name_len;
 147
 148             // Trim leading spaces
 149             while (*b == ' ') {         // the string is zero terminated, we won't exceed the buffer size
 150                 ++ b;
 151             }
 152
 153             // Skip the closing angle bracket
 154             const char* e = end - 1;
 155             while (e > b && *e != '>') {
 156                 -- e;
 157             }
 158
 159             // Trim trailing spaces
 160             while (e > b && *(e - 1) == ' ') {
 161                 -- e;
 162             }
 163
 164             if (b < e) {
 165                 // Parsing seems to have succeeded, the type name is not empty
 166                 begin = b;
 167                 end = e;
 168             }
 169         }
 170     }
 171
 172     return std::string(begin, end);
 173 }
 174
 175
 176 inline std::size_t stl_type_index::hash_code() const BOOST_NOEXCEPT {
 177 #if _MSC_VER > 1600 || (__GNUC__ == 4 && __GNUC_MINOR__ > 5 && defined(__GXX_EXPERIMENTAL_CXX0X__))
 178     return data_->hash_code();
 179 #else
 180     return boost::hash_range(raw_name(), raw_name() + std::strlen(raw_name()));
 181 #endif
 182 }
 183
 184
 185 /// @cond
 186
 187 // for this compiler at least, cross-shared-library type_info
 188 // comparisons don't work, so we are using typeid(x).name() instead.
 189 # if (defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 5))) \
 190     || defined(_AIX) \
 191     || (defined(__sgi) && defined(__host_mips)) \
 192     || (defined(__hpux) && defined(__HP_aCC)) \
 193     || (defined(linux) && defined(__INTEL_COMPILER) && defined(__ICC))
 194 #  define BOOST_CLASSINFO_COMPARE_BY_NAMES
 195 # endif
 196
 197 /// @endcond
 198
 199 inline bool stl_type_index::equal(const stl_type_index& rhs) const BOOST_NOEXCEPT {
 200 #ifdef BOOST_CLASSINFO_COMPARE_BY_NAMES
 201     return raw_name() == rhs.raw_name() || !std::strcmp(raw_name(), rhs.raw_name());
 202 #else
 203     return !!(*data_ == *rhs.data_);
 204 #endif
 205 }
 206
 207 inline bool stl_type_index::before(const stl_type_index& rhs) const BOOST_NOEXCEPT {
 208 #ifdef BOOST_CLASSINFO_COMPARE_BY_NAMES
 209     return raw_name() != rhs.raw_name() && std::strcmp(raw_name(), rhs.raw_name()) < 0;
 210 #else
 211     return !!data_->before(*rhs.data_);
 212 #endif
 213 }
 214
 215 #ifdef BOOST_CLASSINFO_COMPARE_BY_NAMES
 216 #undef BOOST_CLASSINFO_COMPARE_BY_NAMES
 217 #endif
 218
 219
 220
 221 template <class T>
 222 inline stl_type_index stl_type_index::type_id() BOOST_NOEXCEPT {
 223     typedef BOOST_DEDUCED_TYPENAME boost::remove_reference<T>::type no_ref_t;
 224     typedef BOOST_DEDUCED_TYPENAME boost::remove_cv<no_ref_t>::type no_cvr_prefinal_t;
 225
 226     #  if (defined(__EDG_VERSION__) && __EDG_VERSION__ < 245) \
 227         || (defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 744)
 228
 229         // Old EDG-based compilers seem to mistakenly distinguish 'integral' from 'signed integral'
 230         // in typeid() expressions. Full template specialization for 'integral' fixes that issue:
 231         typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<
 232             boost::is_signed<no_cvr_prefinal_t>,
 233             boost::make_signed<no_cvr_prefinal_t>,
 234             boost::mpl::identity<no_cvr_prefinal_t>
 235         >::type no_cvr_prefinal_lazy_t;
 236
 237         typedef BOOST_DEDUCED_TYPENAME no_cvr_prefinal_t::type no_cvr_t;
 238     #else
 239         typedef no_cvr_prefinal_t no_cvr_t;
 240     #endif
 241
 242     return typeid(no_cvr_t);
 243 }
 244
 245 namespace detail {
 246     template <class T> class cvr_saver{};
 247 }
 248
 249 template <class T>
 250 inline stl_type_index stl_type_index::type_id_with_cvr() BOOST_NOEXCEPT {
 251     typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<
 252         boost::mpl::or_<boost::is_reference<T>, boost::is_const<T>, boost::is_volatile<T> >,
 253         detail::cvr_saver<T>,
 254         T
 255     >::type type;
 256
 257     return typeid(type);
 258 }
 259
 260
 261 template <class T>
 262 inline stl_type_index stl_type_index::type_id_runtime(const T& value) BOOST_NOEXCEPT {
 263 #ifdef BOOST_NO_RTTI
 264     return value.boost_type_index_type_id_runtime_();
 265 #else
 266     return typeid(value);
 267 #endif
 268 }
 269
 270 }} // namespace boost::typeindex
 271
 272 #endif // BOOST_TYPE_INDEX_STL_TYPE_INDEX_HPP