| #ifndef BOOST_SERIALIZATION_BASE_OBJECT_HPP |
| #define BOOST_SERIALIZATION_BASE_OBJECT_HPP |
| |
| // MS compatible compilers support #pragma once |
| #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
| # pragma once |
| #endif |
| |
| /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
| // base_object.hpp: |
| |
| // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . |
| // Use, modification and distribution is subject to 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) |
| |
| // See http://www.boost.org for updates, documentation, and revision history. |
| |
| // if no archive headers have been included this is a no op |
| // this is to permit BOOST_EXPORT etc to be included in a |
| // file declaration header |
| |
| #include <boost/config.hpp> |
| #include <boost/detail/workaround.hpp> |
| |
| #include <boost/mpl/eval_if.hpp> |
| #include <boost/mpl/int.hpp> |
| #include <boost/mpl/bool.hpp> |
| #include <boost/mpl/identity.hpp> |
| |
| #include <boost/type_traits/is_base_and_derived.hpp> |
| #include <boost/type_traits/is_pointer.hpp> |
| #include <boost/type_traits/is_const.hpp> |
| #include <boost/type_traits/is_polymorphic.hpp> |
| |
| #include <boost/static_assert.hpp> |
| #include <boost/serialization/access.hpp> |
| #include <boost/serialization/force_include.hpp> |
| #include <boost/serialization/void_cast_fwd.hpp> |
| |
| namespace boost { |
| namespace serialization { |
| |
| namespace detail |
| { |
| // get the base type for a given derived type |
| // preserving the const-ness |
| template<class B, class D> |
| struct base_cast |
| { |
| typedef BOOST_DEDUCED_TYPENAME |
| mpl::if_< |
| is_const<D>, |
| const B, |
| B |
| >::type type; |
| BOOST_STATIC_ASSERT(is_const<type>::value == is_const<D>::value); |
| }; |
| |
| // only register void casts if the types are polymorphic |
| template<class Base, class Derived> |
| struct base_register |
| { |
| struct polymorphic { |
| static void const * invoke(){ |
| Base const * const b = 0; |
| Derived const * const d = 0; |
| return & void_cast_register(d, b); |
| } |
| }; |
| struct non_polymorphic { |
| static void const * invoke(){ |
| return 0; |
| } |
| }; |
| static void const * invoke(){ |
| typedef BOOST_DEDUCED_TYPENAME mpl::eval_if< |
| is_polymorphic<Base>, |
| mpl::identity<polymorphic>, |
| mpl::identity<non_polymorphic> |
| >::type type; |
| return type::invoke(); |
| } |
| }; |
| |
| } // namespace detail |
| #if defined(__BORLANDC__) && __BORLANDC__ < 0x610 |
| template<class Base, class Derived> |
| const Base & |
| base_object(const Derived & d) |
| { |
| BOOST_STATIC_ASSERT(! is_pointer<Derived>::value); |
| detail::base_register<Base, Derived>::invoke(); |
| return access::cast_reference<const Base, Derived>(d); |
| } |
| #else |
| template<class Base, class Derived> |
| BOOST_DEDUCED_TYPENAME detail::base_cast<Base, Derived>::type & |
| base_object(Derived &d) |
| { |
| BOOST_STATIC_ASSERT(( is_base_and_derived<Base,Derived>::value)); |
| BOOST_STATIC_ASSERT(! is_pointer<Derived>::value); |
| typedef BOOST_DEDUCED_TYPENAME detail::base_cast<Base, Derived>::type type; |
| detail::base_register<type, Derived>::invoke(); |
| return access::cast_reference<type, Derived>(d); |
| } |
| #endif |
| |
| } // namespace serialization |
| } // namespace boost |
| |
| #endif // BOOST_SERIALIZATION_BASE_OBJECT_HPP |