[boost] serialization as generialized I/O

From: Neal Becker (ndbecker2_at_[hidden])
Date: 2005-08-26 18:04:32

Looking again at mersenne_twister, one of the objections that has been
raised to adding serialization support, is that there is already iostream
I/O support.  It is in principle possible to leverage iostream to do
serialization.

Unfortunately, that approach is hardly efficient and rather ugly IMHO.

But, what about the other way around?  If we have generic archive support,
can we use it to eliminate the need for iostream?  I think so.

In fact, consider this code (assuming serialization suport added to
mersenne_twister):
typedef  boost::mt19937 rng_t;

int main() {
  rng_t rng1;

  std::ostringstream os;
  boost::archive::text_oarchive oa(os, boost::archive::no_header);
  oa << const_cast<const rng_t&>(rng1);

  std::string st (os.str());

  std::cout << rng1 << '\n';
  std::cout << st << '\n';
}

As it is, the 2 outputs are almost identical.  There is only one difference:
the text_oarchive (,no_header) output prints 2 leading '0' characters.

Is there some way to suppress this preamble?

If so, then we have a more elegant solution.  All we need to do is put in
the serialization support and remove the iostream support, since
serialization is just a generalization of i/o.