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112 lines
3.4 KiB
112 lines
3.4 KiB
#ifndef BOOST_SERIALIZATION_BASE_OBJECT_HPP |
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#define BOOST_SERIALIZATION_BASE_OBJECT_HPP |
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// MS compatible compilers support #pragma once |
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#if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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# pragma once |
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#endif |
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
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// base_object.hpp: |
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// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . |
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// Use, modification and distribution is subject to the Boost Software |
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// See http://www.boost.org for updates, documentation, and revision history. |
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// if no archive headers have been included this is a no op |
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// this is to permit BOOST_EXPORT etc to be included in a |
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// file declaration header |
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#include <boost/config.hpp> |
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#include <boost/detail/workaround.hpp> |
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#include <boost/mpl/eval_if.hpp> |
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#include <boost/mpl/int.hpp> |
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#include <boost/mpl/bool.hpp> |
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#include <boost/mpl/identity.hpp> |
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#include <boost/type_traits/is_base_and_derived.hpp> |
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#include <boost/type_traits/is_pointer.hpp> |
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#include <boost/type_traits/is_const.hpp> |
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#include <boost/type_traits/is_polymorphic.hpp> |
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#include <boost/static_assert.hpp> |
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#include <boost/serialization/access.hpp> |
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#include <boost/serialization/force_include.hpp> |
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#include <boost/serialization/void_cast_fwd.hpp> |
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namespace boost { |
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namespace serialization { |
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namespace detail |
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{ |
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// get the base type for a given derived type |
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// preserving the const-ness |
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template<class B, class D> |
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struct base_cast |
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{ |
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typedef BOOST_DEDUCED_TYPENAME |
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mpl::if_< |
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is_const<D>, |
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const B, |
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B |
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>::type type; |
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BOOST_STATIC_ASSERT(is_const<type>::value == is_const<D>::value); |
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}; |
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// only register void casts if the types are polymorphic |
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template<class Base, class Derived> |
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struct base_register |
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{ |
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struct polymorphic { |
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static void const * invoke(){ |
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Base const * const b = 0; |
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Derived const * const d = 0; |
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return & void_cast_register(d, b); |
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} |
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}; |
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struct non_polymorphic { |
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static void const * invoke(){ |
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return 0; |
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} |
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}; |
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static void const * invoke(){ |
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typedef BOOST_DEDUCED_TYPENAME mpl::eval_if< |
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is_polymorphic<Base>, |
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mpl::identity<polymorphic>, |
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mpl::identity<non_polymorphic> |
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>::type type; |
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return type::invoke(); |
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} |
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}; |
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} // namespace detail |
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#if defined(__BORLANDC__) && __BORLANDC__ < 0x610 |
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template<class Base, class Derived> |
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const Base & |
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base_object(const Derived & d) |
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{ |
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BOOST_STATIC_ASSERT(! is_pointer<Derived>::value); |
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detail::base_register<Base, Derived>::invoke(); |
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return access::cast_reference<const Base, Derived>(d); |
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} |
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#else |
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template<class Base, class Derived> |
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BOOST_DEDUCED_TYPENAME detail::base_cast<Base, Derived>::type & |
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base_object(Derived &d) |
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{ |
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BOOST_STATIC_ASSERT(( is_base_and_derived<Base,Derived>::value)); |
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BOOST_STATIC_ASSERT(! is_pointer<Derived>::value); |
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typedef BOOST_DEDUCED_TYPENAME detail::base_cast<Base, Derived>::type type; |
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detail::base_register<type, Derived>::invoke(); |
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return access::cast_reference<type, Derived>(d); |
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} |
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#endif |
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} // namespace serialization |
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} // namespace boost |
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#endif // BOOST_SERIALIZATION_BASE_OBJECT_HPP
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