namespace boost {
namespace icl {
template<> struct difference_type_of<boost::posix_time::ptime>;
template<> struct has_difference<boost::posix_time::ptime>;
template<> struct has_difference<boost::posix_time::time_duration>;
template<> struct is_discrete<boost::posix_time::ptime>;
template<> struct is_discrete<boost::posix_time::time_duration>;
template<> struct size_type_of<boost::posix_time::ptime>;
template<> struct size_type_of<boost::posix_time::time_duration>;
boost::posix_time::ptime operator++(boost::posix_time::ptime & x);
boost::posix_time::ptime operator--(boost::posix_time::ptime & x);
boost::posix_time::time_duration
operator++(boost::posix_time::time_duration & x);
boost::posix_time::time_duration
operator--(boost::posix_time::time_duration & x);
}
}