/usr/include/ns3.17/ns3/output-stream-wrapper.h is in libns3-dev 3.17+dfsg-1build1.
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/*
* Copyright (c) 2010 University of Washington
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef OUTPUT_STREAM_WRAPPER_H
#define OUTPUT_STREAM_WRAPPER_H
#include <fstream>
#include "ns3/object.h"
#include "ns3/ptr.h"
#include "ns3/simple-ref-count.h"
namespace ns3 {
/*
* @brief A class encapsulating an STL output stream.
*
* This class wraps a pointer to a C++ std::ostream and provides
* reference counting of the object. This class is recommended for users
* who want to pass output streams in the ns-3 APIs, such as in callbacks
* or tracing.
*
* This class is motivated by the fact that in C++, copy and assignment of
* iostreams is forbidden by std::basic_ios<>, because it is not possible
* to predict the semantics of the stream desired by a user.
*
* When writing traced information to a file, the tempting ns-3 idiom is to
* create a bound callback with an ofstream as the bound object. Unfortunately,
* this implies a copy construction in order to get the ofstream object into the
* callback. This operation, as mentioned above, is forbidden by the STL.
* Using this class in ns-3 APIs is generally preferable to passing global
* pointers to ostream objects, or passing a pointer to a stack allocated
* ostream (which creates object lifetime issues).
*
* One could imagine having this object inherit from stream to get the various
* overloaded operator<< defined, but we're going to be using a
* Ptr<OutputStreamWrapper> when passing this object around. In this case, the
* Ptr<> wouldn't understand the operators and we would have to dereference it
* to access the underlying object methods. Since we would have to dereference
* the Ptr<>, we don't bother and just expect the user to Get a saved pointer
* to an ostream and dereference it him or herself. As in:
*
* \verbatim
* void
* TraceSink (Ptr<OutputStreamWrapper> streamWrapper, Ptr<const Packet> packet)
* {
* std::ostream *stream = streamWrapper->GetStream ();
* *stream << "got packet" << std::endl;
* }
* \endverbatim
*
*
* This class uses a basic ns-3 reference counting base class but is not
* an ns3::Object with attributes, TypeId, or aggregation.
*/
class OutputStreamWrapper : public SimpleRefCount<OutputStreamWrapper>
{
public:
OutputStreamWrapper (std::string filename, std::ios::openmode filemode);
OutputStreamWrapper (std::ostream* os);
~OutputStreamWrapper ();
/**
* Return a pointer to an ostream previously set in the wrapper.
*
* \see SetStream
*
* \returns a pointer to the encapsulated std::ostream
*/
std::ostream *GetStream (void);
private:
std::ostream *m_ostream;
bool m_destroyable;
};
} // namespace ns3
#endif /* OUTPUT_STREAM_WRAPPER_H */
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