299 lines
8.7 KiB
C++
299 lines
8.7 KiB
C++
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#ifndef BOOST_SERIALIZATION_VOID_CAST_HPP
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#define BOOST_SERIALIZATION_VOID_CAST_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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// void_cast.hpp: interface for run-time casting of void pointers.
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// (C) Copyright 2002-2009 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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// gennadiy.rozental@tfn.com
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// See http://www.boost.org for updates, documentation, and revision history.
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#include <cstddef> // for ptrdiff_t
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#include <boost/config.hpp>
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#include <boost/noncopyable.hpp>
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#include <boost/serialization/smart_cast.hpp>
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#include <boost/serialization/singleton.hpp>
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#include <boost/serialization/force_include.hpp>
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#include <boost/serialization/type_info_implementation.hpp>
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#include <boost/serialization/extended_type_info.hpp>
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#include <boost/type_traits/is_virtual_base_of.hpp>
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#include <boost/serialization/void_cast_fwd.hpp>
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#include <boost/serialization/config.hpp>
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#include <boost/config/abi_prefix.hpp> // must be the last header
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#ifdef BOOST_MSVC
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# pragma warning(push)
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# pragma warning(disable : 4251 4231 4660 4275)
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#endif
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namespace boost {
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namespace serialization {
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class extended_type_info;
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// Given a void *, assume that it really points to an instance of one type
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// and alter it so that it would point to an instance of a related type.
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// Return the altered pointer. If there exists no sequence of casts that
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// can transform from_type to to_type, return a NULL.
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BOOST_SERIALIZATION_DECL void const *
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void_upcast(
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extended_type_info const & derived,
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extended_type_info const & base,
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void const * const t
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);
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inline void *
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void_upcast(
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extended_type_info const & derived,
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extended_type_info const & base,
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void * const t
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){
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return const_cast<void*>(void_upcast(
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derived,
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base,
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const_cast<void const *>(t)
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));
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}
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BOOST_SERIALIZATION_DECL void const *
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void_downcast(
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extended_type_info const & derived,
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extended_type_info const & base,
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void const * const t
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);
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inline void *
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void_downcast(
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extended_type_info const & derived,
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extended_type_info const & base,
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void * const t
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){
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return const_cast<void*>(void_downcast(
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derived,
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base,
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const_cast<void const *>(t)
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));
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}
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namespace void_cast_detail {
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class BOOST_SYMBOL_VISIBLE void_caster :
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private boost::noncopyable
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{
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friend
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BOOST_SERIALIZATION_DECL void const *
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boost::serialization::void_upcast(
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extended_type_info const & derived,
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extended_type_info const & base,
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void const * const
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);
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friend
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BOOST_SERIALIZATION_DECL void const *
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boost::serialization::void_downcast(
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extended_type_info const & derived,
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extended_type_info const & base,
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void const * const
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);
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protected:
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BOOST_SERIALIZATION_DECL void recursive_register(bool includes_virtual_base = false) const;
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BOOST_SERIALIZATION_DECL void recursive_unregister() const;
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virtual bool has_virtual_base() const = 0;
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public:
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// Data members
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const extended_type_info * m_derived;
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const extended_type_info * m_base;
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/*const*/ std::ptrdiff_t m_difference;
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void_caster const * const m_parent;
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// note that void_casters are keyed on value of
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// member extended type info records - NOT their
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// addresses. This is necessary in order for the
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// void cast operations to work across dll and exe
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// module boundries.
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bool operator<(const void_caster & rhs) const;
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const void_caster & operator*(){
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return *this;
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}
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// each derived class must re-implement these;
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virtual void const * upcast(void const * const t) const = 0;
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virtual void const * downcast(void const * const t) const = 0;
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// Constructor
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void_caster(
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extended_type_info const * derived,
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extended_type_info const * base,
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std::ptrdiff_t difference = 0,
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void_caster const * const parent = 0
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) :
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m_derived(derived),
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m_base(base),
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m_difference(difference),
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m_parent(parent)
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{}
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virtual ~void_caster(){}
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};
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#ifdef BOOST_MSVC
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# pragma warning(push)
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# pragma warning(disable : 4251 4231 4660 4275 4511 4512)
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#endif
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template <class Derived, class Base>
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class BOOST_SYMBOL_VISIBLE void_caster_primitive :
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public void_caster
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{
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virtual void const * downcast(void const * const t) const {
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const Derived * d =
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boost::serialization::smart_cast<const Derived *, const Base *>(
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static_cast<const Base *>(t)
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);
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return d;
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}
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virtual void const * upcast(void const * const t) const {
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const Base * b =
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boost::serialization::smart_cast<const Base *, const Derived *>(
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static_cast<const Derived *>(t)
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);
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return b;
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}
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virtual bool has_virtual_base() const {
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return false;
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}
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public:
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void_caster_primitive();
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virtual ~void_caster_primitive();
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};
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template <class Derived, class Base>
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void_caster_primitive<Derived, Base>::void_caster_primitive() :
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void_caster(
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& type_info_implementation<Derived>::type::get_const_instance(),
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& type_info_implementation<Base>::type::get_const_instance(),
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// note:I wanted to displace from 0 here, but at least one compiler
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// treated 0 by not shifting it at all.
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reinterpret_cast<std::ptrdiff_t>(
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static_cast<Derived *>(
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reinterpret_cast<Base *>(8)
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)
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) - 8
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)
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{
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recursive_register();
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}
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template <class Derived, class Base>
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void_caster_primitive<Derived, Base>::~void_caster_primitive(){
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recursive_unregister();
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}
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template <class Derived, class Base>
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class BOOST_SYMBOL_VISIBLE void_caster_virtual_base :
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public void_caster
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{
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virtual bool has_virtual_base() const {
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return true;
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}
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public:
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virtual void const * downcast(void const * const t) const {
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const Derived * d =
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dynamic_cast<const Derived *>(
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static_cast<const Base *>(t)
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);
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return d;
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}
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virtual void const * upcast(void const * const t) const {
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const Base * b =
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dynamic_cast<const Base *>(
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static_cast<const Derived *>(t)
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);
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return b;
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}
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void_caster_virtual_base();
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virtual ~void_caster_virtual_base();
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};
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#ifdef BOOST_MSVC
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#pragma warning(pop)
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#endif
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template <class Derived, class Base>
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void_caster_virtual_base<Derived,Base>::void_caster_virtual_base() :
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void_caster(
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& (type_info_implementation<Derived>::type::get_const_instance()),
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& (type_info_implementation<Base>::type::get_const_instance())
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)
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{
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recursive_register(true);
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}
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template <class Derived, class Base>
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void_caster_virtual_base<Derived,Base>::~void_caster_virtual_base(){
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recursive_unregister();
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}
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template <class Derived, class Base>
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struct BOOST_SYMBOL_VISIBLE void_caster_base :
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public void_caster
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{
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typedef
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typename mpl::eval_if<boost::is_virtual_base_of<Base,Derived>,
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mpl::identity<
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void_cast_detail::void_caster_virtual_base<Derived, Base>
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>
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,// else
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mpl::identity<
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void_cast_detail::void_caster_primitive<Derived, Base>
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>
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>::type type;
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};
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} // void_cast_detail
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template<class Derived, class Base>
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BOOST_DLLEXPORT
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inline const void_cast_detail::void_caster & void_cast_register(
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Derived const * /* dnull = NULL */,
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Base const * /* bnull = NULL */
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){
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typedef
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typename mpl::eval_if<boost::is_virtual_base_of<Base,Derived>,
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mpl::identity<
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void_cast_detail::void_caster_virtual_base<Derived, Base>
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>
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,// else
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mpl::identity<
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void_cast_detail::void_caster_primitive<Derived, Base>
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>
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>::type typex;
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return singleton<typex>::get_const_instance();
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}
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template<class Derived, class Base>
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class BOOST_SYMBOL_VISIBLE void_caster :
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public void_cast_detail::void_caster_base<Derived, Base>::type
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{
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};
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} // namespace serialization
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} // namespace boost
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#ifdef BOOST_MSVC
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# pragma warning(pop)
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#endif
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#include <boost/config/abi_suffix.hpp> // pops abi_suffix.hpp pragmas
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#endif // BOOST_SERIALIZATION_VOID_CAST_HPP
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