boost :: serialize和std :: chrono :: system_clock :: time_point

Question

I am trying to serialize a class that contains a std::chrono::system_clock::time_point with boost::serialize.

template <class Archive> void serialize(Archive& ar, unsigned int version) {
    ar & timePoint_;
}

However I get the error:

Error 1 error C2039: 'serialize' : is not a member of 'std::chrono::time_point<_Clock>' c:\\boost_1_54_0\\boost\\serialization\\access.hpp 118

How do I fix this?

Answer 1

Use

boost::serialization::make_binary_object(void * t, size_t size);

from boost/serialization/binary_object.hpp wchich can be used like this:

std::chrono::system_clock::time_point tp;
ar & boost::serialization::make_binary_object(&tp, sizeof(tp));

Answer 2

I managed to get it to work using the following intrusive function (in the class which has the timepoint_ as a member function)

template <class Archive> void serialize(Archive& ar, unsigned int version) {
    char * ptr = reinterpret_cast<char *>(&timePoint_);
    for( int i = 0; i < sizeof(timePoint_); ++i)
        ar & ptr[i];
    /*snip*/
}