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1 | // |
2 | // Copyright (c) Chris Glover, 2016. | |
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_RUNTIME_CAST_DETAIL_RUNTIME_CAST_IMPL_HPP | |
10 | #define BOOST_TYPE_INDEX_RUNTIME_CAST_DETAIL_RUNTIME_CAST_IMPL_HPP | |
11 | ||
12 | /// \file runtime_cast_impl.hpp | |
13 | /// \brief Contains the overload of boost::typeindex::runtime_cast for | |
14 | /// pointer types. | |
15 | /// | |
16 | /// boost::typeindex::runtime_cast can be used to emulate dynamic_cast | |
17 | /// functionality on platorms that don't provide it or should the user | |
18 | /// desire opt in functionality instead of enabling it system wide. | |
19 | ||
20 | #include <boost/type_index.hpp> | |
21 | #include <boost/type_traits/integral_constant.hpp> | |
22 | ||
23 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
24 | # pragma once | |
25 | #endif | |
26 | ||
27 | namespace boost { namespace typeindex { | |
28 | ||
29 | namespace detail { | |
30 | ||
31 | template<typename T, typename U> | |
32 | T* runtime_cast_impl(U* u, boost::true_type) BOOST_NOEXCEPT { | |
33 | return u; | |
34 | } | |
35 | ||
36 | template<typename T, typename U> | |
37 | T const* runtime_cast_impl(U const* u, boost::true_type) BOOST_NOEXCEPT { | |
38 | return u; | |
39 | } | |
40 | ||
41 | template<typename T, typename U> | |
42 | T* runtime_cast_impl(U* u, boost::false_type) BOOST_NOEXCEPT { | |
43 | return const_cast<T*>(static_cast<T const*>( | |
44 | u->boost_type_index_find_instance_(boost::typeindex::type_id<T>()) | |
45 | )); | |
46 | } | |
47 | ||
48 | template<typename T, typename U> | |
49 | T const* runtime_cast_impl(U const* u, boost::false_type) BOOST_NOEXCEPT { | |
50 | return static_cast<T const*>(u->boost_type_index_find_instance_(boost::typeindex::type_id<T>())); | |
51 | } | |
52 | ||
53 | } // namespace detail | |
54 | ||
55 | }} // namespace boost::typeindex | |
56 | ||
57 | #endif // BOOST_TYPE_INDEX_RUNTIME_CAST_DETAIL_RUNTIME_CAST_IMPL_HPP |