Re: [boost] patch to serialize mersenne_twister

Subject: Re: [boost] patch to serialize mersenne_twister
From: Neal Becker (ndbecker2_at_[hidden])
Date: 2008-10-30 07:25:35

Robert Ramey wrote:

> Neal Becker wrote:
>>> Since it wants private access into the class, how would you package
>> it as a separate header?
> 
> add "friend class boost::serialization::access;" to the class declaration.
> 
> Robert Ramey
> 
I don't see how that works.  If I add

friend class boost::serialization::access;

inside of the original class declaration, and then outside the class declaration:

typedef boost::mt19937 rng_t;

namespace boost { namespace serialization {
 // Serialization
  template<class Archive>
  void serialize(Archive & ar, rng &m, const unsigned int /* file_version */){
    ar & serialization::make_nvp ("i", m.i);
    ar & serialization::make_nvp ("x", m.x);
  }
}}

This doesn't compile:
/usr/local/src/boost.hg/boost/random/mersenne_twister.hpp:209: error: 'int boost::random::mersenne_twister<unsigned int, 32, 624, 397, 31, 2567483615u, 11, 7, 2636928640u, 15, 4022730752u, 18, 3346425566u>::i' is private
mod/boost_rand.cc:49: error: within this context