source: NonGTP/Boost/boost/serialization/extended_type_info_no_rtti.hpp @ 857

#ifndef BOOST_EXTENDED_TYPE_INFO_NO_RTTI_HPP
#define BOOST_EXTENDED_TYPE_INFO_NO_RTTI_HPP
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif

// extended_type_info_no_rtti.hpp: implementation for version that depends
// on runtime typing (rtti - typeid) but uses a user specified string
// as the portable class identifier.

// (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.
#include <cassert>
#include <boost/config.hpp>
#include <boost/static_assert.hpp>
#include <boost/type_traits/is_const.hpp>

#include <boost/serialization/extended_type_info.hpp>
#include <boost/mpl/bool.hpp>

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

namespace boost {
namespace serialization {
namespace detail {
///////////////////////////////////////////////////////////////////////
// define a special type_info that doesn't depend on rtti which is not
// available in all situations.

// common base class to share type_info_key.  This is used to 
// identify the method used to keep track of the extended type
class BOOST_SERIALIZATION_DECL(BOOST_PP_EMPTY()) extended_type_info_no_rtti_0 : 
    public extended_type_info
{
    virtual bool
    less_than(const boost::serialization::extended_type_info &rhs) const ;
protected:
    extended_type_info_no_rtti_0();
    // account for bogus gcc warning
    #if defined(__GNUC__)
    virtual
    #endif
    ~extended_type_info_no_rtti_0();
public:
    struct is_polymorphic
    {
        typedef boost::mpl::bool_<true> type;
        BOOST_STATIC_CONSTANT(bool, value = is_polymorphic::type::value);
    };
};

template<class T>
class extended_type_info_no_rtti_1 : 
    public extended_type_info_no_rtti_0
{
protected:
    extended_type_info_no_rtti_1(){}
public:
    // note borland complains at making this destructor protected
    ~extended_type_info_no_rtti_1(){};
    static const boost::serialization::extended_type_info *
    get_derived_extended_type_info(const T & t){
        // find the type that corresponds to the most derived type.
        // this implementation doesn't depend on typeid() but assumes
        // that the specified type has a function of the following signature.
        // A common implemention of such a function is to define as a virtual
        // function. 
        const char * derived_key = t.get_key();
        assert(NULL != derived_key);
        return boost::serialization::extended_type_info::find(derived_key);
    }
    static boost::serialization::extended_type_info *
    get_instance(){
        static extended_type_info_no_rtti_1<T> instance;
        return & instance;
    }
    static void
    export_register(const char * key){
        boost::serialization::extended_type_info * eti;
        eti = get_instance();
        eti->key_register(key);  // initialize key and add to table
        eti->self_register();    // add type to type table
    }
};
} // namespace detail

template<class T>
class extended_type_info_no_rtti : 
    public detail::extended_type_info_no_rtti_1<const T>
{
    // private constructor to inhibit any existence other than the 
    // static one
    extended_type_info_no_rtti(){}
    ~extended_type_info_no_rtti(){};
};

} // namespace serialization
} // namespace boost

///////////////////////////////////////////////////////////////////////////////
// If no other implementation has been designated as default, 
// use this one.  To use this implementation as the default, specify it
// before any of the other headers.

#ifndef BOOST_SERIALIZATION_DEFAULT_TYPE_INFO
#define BOOST_SERIALIZATION_DEFAULT_TYPE_INFO(T) \
    extended_type_info_no_rtti<const T>
/**/
#endif

#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
#include <boost/config/abi_suffix.hpp> // pops abi_suffix.hpp pragmas

#endif // BOOST_EXTENDED_TYPE_INFO_NO_RTTI_HPP