boost_deser_chrono_duration.cpp

namespace boost {
namespace archive {
    template<typename Archive, typename Rep, typename Period>
    void load(Archive& ar, std::chrono::duration<Rep, Period> dur, const unsigned int version) {
        int64_t duration;
        ar >> duration;
        dur = std::chrono::duration<Rep, Period>(duration);
    }

    template<typename Archive, typename Rep, typename Period>
    void save(Archive& ar, std::chrono::duration<Rep, Period> dur, const unsigned int version) {
        auto duration = std::chrono::duration_cast<std::chrono::milliseconds, Rep, Period>(dur).count();
        ar << duration;
    }

    template<typename Archive, typename Rep, typename Period>
    inline void serialize(Archive& ar, std::chrono::duration<Rep, Period>& dur, const unsigned int version) {
        boost::serialization::split_free(ar, dur, version);
    }
}
}