Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards



// MS compatible compilers support #pragma once
#if defined(_MSC_VER)
# pragma once

// extended_type_info.hpp: interface for portable version of type_info

// (C) Copyright 2002 Robert Ramey - .
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at

//  See for updates, documentation, and revision history.

// for now, extended type info is part of the serialization libraries
// this could change in the future.
#include <cstdarg>
#include <boost/assert.hpp>
#include <cstddef> // NULL
#include <boost/config.hpp>
#include <boost/noncopyable.hpp>
#include <boost/mpl/bool.hpp>

#include <boost/serialization/config.hpp>
#include <boost/config/abi_prefix.hpp> // must be the last header
#  pragma warning(push)
#  pragma warning(disable : 4251 4231 4660 4275)


namespace boost {
namespace serialization {

namespace void_cast_detail{
    class void_caster;

class BOOST_SYMBOL_VISIBLE extended_type_info :
    private boost::noncopyable
    friend class boost::serialization::void_cast_detail::void_caster;

    // used to uniquely identify the type of class derived from this one
    // so that different derivations of this class can be simultaneously
    // included in implementation of sets and maps.
    const unsigned int m_type_info_key;
    virtual bool is_less_than(const extended_type_info & /*rhs*/) const = 0;
    virtual bool is_equal(const extended_type_info & /*rhs*/) const = 0;
    const char * m_key;

    BOOST_SERIALIZATION_DECL void key_unregister() const;
    BOOST_SERIALIZATION_DECL void key_register() const;
    // this class can't be used as is. It's just the
    // common functionality for all type_info replacement
    // systems.  Hence, make these protected
    BOOST_SERIALIZATION_DECL extended_type_info(
        const unsigned int type_info_key,
        const char * key
    virtual BOOST_SERIALIZATION_DECL ~extended_type_info();
    const char * get_key() const {
        return m_key;
    virtual const char * get_debug_info() const = 0;
    BOOST_SERIALIZATION_DECL bool operator<(const extended_type_info &rhs) const;
    BOOST_SERIALIZATION_DECL bool operator==(const extended_type_info &rhs) const;
    bool operator!=(const extended_type_info &rhs) const {
        return !(operator==(rhs));
    // note explicit "export" of static function to work around
    // gcc 4.5 mingw error
    static BOOST_SERIALIZATION_DECL const extended_type_info *
    find(const char *key);
    // for plugins
    virtual void * construct(unsigned int /*count*/ = 0, ...) const = 0;
    virtual void destroy(void const * const /*p*/) const = 0;

template<class T>
struct guid_defined : boost::mpl::false_ {};

namespace ext {
    template <typename T>
    struct guid_impl
        static inline const char * call()
            return NULL;

template<class T>
inline const char * guid(){
    return ext::guid_impl<T>::call();

} // namespace serialization
} // namespace boost

#pragma warning(pop)

#include <boost/config/abi_suffix.hpp> // pops abi_suffix.hpp pragmas