Line data    Source code

       1             : //
       2             : // Copyright (c) 2023 Christian Mazakas
       3             : // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
       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             : // Official repository: https://github.com/cppalliance/http_proto
       9             : //
      10             : 
      11             : #ifndef BOOST_HTTP_PROTO_DETAIL_TYPE_INDEX_HPP
      12             : #define BOOST_HTTP_PROTO_DETAIL_TYPE_INDEX_HPP
      13             : 
      14             : #include <boost/container_hash/hash.hpp>
      15             : #include <boost/core/typeinfo.hpp>
      16             : #include <boost/config.hpp>
      17             : 
      18             : namespace boost {
      19             : namespace http_proto {
      20             : namespace detail {
      21             : 
      22             : struct type_index_impl {
      23             : private:
      24             :   boost::core::typeinfo const *pdata_ = nullptr;
      25             : 
      26         856 :   std::size_t get_raw_name_length() const noexcept {
      27             :     // Boost.TypeIndex has a dramatically more sophisticated implementation here
      28             :     // see if this eventually turns out to matter and if it does, essentially
      29             :     // just do more copy-paste
      30         856 :     return std::strlen(raw_name());
      31             :   }
      32             : 
      33         792 :   bool equal(type_index_impl const &rhs) const noexcept {
      34         792 :     return raw_name() == rhs.raw_name() ||
      35         792 :            !std::strcmp(raw_name(), rhs.raw_name());
      36             :   }
      37             : 
      38             : public:
      39         824 :   type_index_impl(boost::core::typeinfo const &type_info) noexcept
      40         824 :       : pdata_(&type_info) {}
      41             : 
      42             :   type_index_impl(type_index_impl const &) = default;
      43             :   type_index_impl &operator=(type_index_impl const &) = default;
      44             : 
      45             :   ~type_index_impl() = default;
      46             : 
      47         824 :   template <class T> static type_index_impl type_id() noexcept {
      48         824 :     return type_index_impl(BOOST_CORE_TYPEID(T));
      49             :   }
      50             : 
      51        4152 :   char const *raw_name() const noexcept { return pdata_->name(); }
      52             : 
      53         856 :   std::size_t hash_code() const noexcept {
      54         856 :     return boost::hash_range(raw_name(), raw_name() + get_raw_name_length());
      55             :   }
      56             : 
      57         792 :   bool operator==(type_index_impl const &rhs) const noexcept {
      58         792 :     return equal(rhs);
      59             :   }
      60             : 
      61             :   bool operator!=(type_index_impl const &rhs) const noexcept {
      62             :     return !equal(rhs);
      63             :   }
      64             : };
      65             : 
      66             : // like std::type_index,
      67             : // but without requiring RTTI
      68             : using type_index = type_index_impl;
      69             : 
      70         824 : template <class T> type_index get_type_index() noexcept {
      71         824 :   return type_index_impl::type_id<T>();
      72             : }
      73             : 
      74             : struct type_index_hasher {
      75         856 :   std::size_t operator()(type_index const &tid) const noexcept {
      76         856 :     return tid.hash_code();
      77             :   }
      78             : };
      79             : 
      80         792 : template <class U, class T> U downcast(T *p) {
      81             : #ifdef BOOST_NO_RTTI
      82             :   return static_cast<U>(p);
      83             : #else
      84         792 :   return dynamic_cast<U>(p);
      85             : #endif
      86             : }
      87             : 
      88          32 : template <class U, class T> U downcast(T &p) {
      89             : #ifdef BOOST_NO_RTTI
      90             :   return static_cast<U>(p);
      91             : #else
      92          32 :   return dynamic_cast<U>(p);
      93             : #endif
      94             : }
      95             : 
      96             : } // namespace detail
      97             : } // namespace http_proto
      98             : } // namespace boost
      99             : 
     100             : #endif