101 lines
3.0 KiB
C++
101 lines
3.0 KiB
C++
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#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)
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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/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 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 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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template<class Base, class Derived>
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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 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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} // namespace serialization
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} // namespace boost
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#endif // BOOST_SERIALIZATION_BASE_OBJECT_HPP
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