#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 |