1 #ifndef BOOST_SERIALIZATION_WRAPPER_HPP 2 #define BOOST_SERIALIZATION_WRAPPER_HPP 3 4 // (C) Copyright 2005-2006 Matthias Troyer 5 // Use, modification and distribution is subject to the Boost Software 6 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 7 // http://www.boost.org/LICENSE_1_0.txt) 8 9 #include <boost/serialization/traits.hpp> 10 #include <boost/type_traits/is_base_and_derived.hpp> 11 #include <boost/mpl/eval_if.hpp> 12 #include <boost/mpl/bool_fwd.hpp> 13 14 namespace boost { namespace serialization { 15 16 /// the base class for serialization wrappers 17 /// 18 /// wrappers need to be treated differently at various places in the serialization library, 19 /// e.g. saving of non-const wrappers has to be possible. Since partial specialization 20 // is not supported by all compilers, we derive all wrappers from wrapper_traits. 21 22 template< 23 class T, 24 int Level = object_serializable, 25 int Tracking = track_never, 26 unsigned int Version = 0, 27 class ETII = extended_type_info_impl< T > 28 > 29 struct wrapper_traits : 30 public traits<T,Level,Tracking,Version,ETII,mpl::true_> 31 {}; 32 33 template<class T> 34 struct is_wrapper_impl : 35 boost::mpl::eval_if< 36 boost::is_base_and_derived<basic_traits,T>, 37 boost::mpl::true_, 38 boost::mpl::false_ 39 >::type 40 {}; 41 42 template<class T> 43 struct is_wrapper { 44 typedef typename is_wrapper_impl<const T>::type type; 45 }; 46 47 } // serialization 48 } // boost 49 50 // A macro to define that a class is a wrapper 51 #define BOOST_CLASS_IS_WRAPPER(T) \ 52 namespace boost { \ 53 namespace serialization { \ 54 template<> \ 55 struct is_wrapper_impl<const T> : boost::mpl::true_ {}; \ 56 } \ 57 } \ 58 /**/ 59 60 #endif //BOOST_SERIALIZATION_WRAPPER_HPP 61