| // |
| // Copyright (c) Chris Glover, 2016. |
| // |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| |
| #ifndef BOOST_TYPE_INDEX_RUNTIME_CAST_DETAIL_RUNTIME_CAST_IMPL_HPP |
| #define BOOST_TYPE_INDEX_RUNTIME_CAST_DETAIL_RUNTIME_CAST_IMPL_HPP |
| |
| /// \file runtime_cast_impl.hpp |
| /// \brief Contains the overload of boost::typeindex::runtime_cast for |
| /// pointer types. |
| /// |
| /// boost::typeindex::runtime_cast can be used to emulate dynamic_cast |
| /// functionality on platorms that don't provide it or should the user |
| /// desire opt in functionality instead of enabling it system wide. |
| |
| #include <boost/type_index.hpp> |
| #include <boost/type_traits/integral_constant.hpp> |
| |
| #ifdef BOOST_HAS_PRAGMA_ONCE |
| # pragma once |
| #endif |
| |
| namespace boost { namespace typeindex { |
| |
| namespace detail { |
| |
| template<typename T, typename U> |
| T* runtime_cast_impl(U* u, boost::true_type) BOOST_NOEXCEPT { |
| return u; |
| } |
| |
| template<typename T, typename U> |
| T const* runtime_cast_impl(U const* u, boost::true_type) BOOST_NOEXCEPT { |
| return u; |
| } |
| |
| template<typename T, typename U> |
| T* runtime_cast_impl(U* u, boost::false_type) BOOST_NOEXCEPT { |
| return const_cast<T*>(static_cast<T const*>( |
| u->boost_type_index_find_instance_(boost::typeindex::type_id<T>()) |
| )); |
| } |
| |
| template<typename T, typename U> |
| T const* runtime_cast_impl(U const* u, boost::false_type) BOOST_NOEXCEPT { |
| return static_cast<T const*>(u->boost_type_index_find_instance_(boost::typeindex::type_id<T>())); |
| } |
| |
| } // namespace detail |
| |
| }} // namespace boost::typeindex |
| |
| #endif // BOOST_TYPE_INDEX_RUNTIME_CAST_DETAIL_RUNTIME_CAST_IMPL_HPP |