[Boost-users] [iostreams] non-copyable device with Boost.Ref pattern

24 Jan 2006

      Here follows a simple pattern to use Boost.IOstreams with your
non-copyable Device, allowing you quick access to formatted input and
output:

#include <boost/iostreams/stream.hpp>
#include <boost/ref.hpp>

#include "foo_device.hpp"

/* Don't; just to make lines shorter. */
using boost::iostreams;
using boost;

class foo_device;

class foo_stream_base {
public:

    /* Define constructor forwarding to foo_device. */
    foo_stream_base (...) : _M_device(...) {}

protected:
    foo_device _M_device;
};

class foo_stream : private foo_stream_base,
                   public stream<reference_wrapper<foo_device> > {
public:

    /* Define constructor forwarding to foo_device. */
    foo_stream (...)
    : foo_stream_base(...),
      stream<reference_wrapper<foo_device> >(ref(_M_device)) {}

};

-- 
Pedro Lamarão
Desenvolvimento

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