source: downloads/boost_1_34_1/boost/serialization/is_abstract.hpp @ 46

#ifndef BOOST_SERIALIZATION_IS_ABSTRACT_CLASS_HPP
#define BOOST_SERIALIZATION_IS_ABSTRACT_CLASS_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
// is_abstract_class.hpp:

// (C) Copyright 2002 Rani Sharoni (rani_sharoni@hotmail.com) and 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
// http://www.boost.org/LICENSE_1_0.txt)

//  See http://www.boost.org for updates, documentation, and revision history.

#include <boost/config.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/type_traits/is_abstract.hpp>

namespace boost {
namespace serialization {
    template<class T>
    struct is_abstract {
        // default to false if not supported
        #ifdef BOOST_NO_IS_ABSTRACT
            typedef BOOST_DEDUCED_TYPENAME mpl::bool_<false> type;
            BOOST_STATIC_CONSTANT(bool, value = false); 
        #else
            typedef BOOST_DEDUCED_TYPENAME boost::is_abstract<T>::type type;
            BOOST_STATIC_CONSTANT(bool, value = type::value); 
        #endif
    };
} // namespace serialization
} // namespace boost

// define a macro to make explicit designation of this more transparent
#define BOOST_IS_ABSTRACT(T)                          \
namespace boost {                                     \
namespace serialization {                             \
template<>                                            \
struct is_abstract< T > {                             \
    typedef mpl::bool_<true> type;                    \
    BOOST_STATIC_CONSTANT(bool, value = true);        \
};                                                    \
}                                                     \
}                                                     \
/**/

#endif //BOOST_SERIALIZATION_IS_ABSTRACT_CLASS_HPP