Hmm - this raises a couple of questions in my mind. I would guess this is because I don't kow what the meserenne twister does. First a slight cosmetic change just to avoid a confusing/ugly cast; template<class Archive> inline void save (Archive &ar, const unsigned int) const { for (int j = 0; j < state_size; ++j) { const UIntType x = compute (j); ar << boost::serialization::make_nvp("item", x); } } But I'm intrigued about one thing. It seems to me that if you have an instance of the class meserenne twister and serialize it to a file then load it back to another instance - the two wont be equal unless compute(j) == j ? What am I missing here? Neal Becker wrote:
I think this is OK now. Here is addition to mersenne_twister.hpp: friend class boost::serialization::access;
template<class Archive> inline void save (Archive &ar, const unsigned int) const { for (int j = 0; j < state_size; ++j) { UIntType x = compute (j); ar << boost::serialization::make_nvp("item", const_cast<const UIntType&>(x)); } }
template<class Archive> inline void load (Archive &ar, const unsigned int) { for (int j = 0; j < state_size; ++j) { ar >> boost::serialization::make_nvp ("item", x[j]); } i = state_size; }
template<class Archive> void serialize(Archive & ar, const unsigned int file_version) { boost::serialization::split_member(ar, *this, file_version); }
Also: #include <boost/serialization/split_member.hpp> #include <boost/serialization/nvp.hpp>
Here is a simple test that passes:
#include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/random.hpp>
typedef boost::mt19937 rng_t;
int main() { rng_t rng1;
std::ostringstream os; boost::archive::text_oarchive oa(os); oa << const_cast<const rng_t&>(rng1);
std::string st (os.str()); std::istringstream is (st); boost::archive::text_iarchive ia (is); rng_t rng2; ia >> rng2;
// std::cout << rng2; assert (rng1 == rng2); }
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