Feb. 2008

Recently, I suggested there should be serialization support wrt 
the Range library - 
http://lists.boost.org/Archives/boost/2008/01/132294.php.
I'm writing to inform you of my plans in this regard.  This input:

Msgs
  (sub_range<list<short> >) @out
}

to the C++ Middleware Writer results in this output:

#include <boost/range/sub_range.hpp>
#include <list>
#include <Buffer.hh>
using boost::sub_range;


struct Msgs
{
inline
Msgs() {}
inline
~Msgs() {}

inline
int
Send(Buffer* buf, const sub_range<list<short> >& about1)
{
  unsigned int headCount = 0;
  headCount = about1.size();
  if (!buf->Receive(&headCount, sizeof(int))) {
    buf->ews_.SetErrorWords(1, __FILE__, __LINE__);
    return 0;
  }
  list<short>::const_iterator rit1 = boost::begin(about1);
  list<short>::const_iterator rit2 = boost::end(about1);
  for (; rit1 != rit2; ++rit1) {
    if (!buf->Receive(&(*rit1), sizeof(short))) {
      buf->ews_.SetErrorWords(1, __FILE__, __LINE__);
      return 0;
    }
  }

  if (!buf->SendStoredData()) {
    buf->ews_.SetErrorWords(2, __FILE__, __LINE__);
    return 0;
  }
  return 1;
} 

};

This functionality isn't available online yet. G-d willing, it
will be available by the middle of next month.  The file Buffer.hh
is here - http://home.seventy7.com/misc/Buffer.hh.

There's also a version that calculates and sends the total message 
length here - http://home.seventy7.com/misc/rangeMsg.hh.  (An option 
on the front end is checked to obtain this functionality.)
This thread on clc++m, http://preview.tinyurl.com/218cnh, 
convinced me of the need to support message lengths.

The @out used above as input to the C++ Middleware Writer
indicates you only want a Send function--by default both a 
Send and Receive function are generated.  I believe sub_range 
supports operator << but not operator >>.  So the @out option 
is necessary when using sub_range.  A container could be 
used to receive data sent via the above Send function; 
as Middle code it would look something like this:

Msgs
  (sub_range<list<short> >) @out
  (vector<short>) @in
}


Brian Wood
Ebenezer Enterprises
www.webebenezer.net

Keep your heart with all diligence; for out of it are the issues
of life.  Proverbs 4:23