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