nullstream.h

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// NullStream.h
//
// $Id: //poco/Main/Foundation/include/Foundation/NullStream.h#5 $
//
// Definition of the NullStreamBuf, NullInputStream and NullOutputStream classes.
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#ifndef Foundation_NullStream_INCLUDED
#define Foundation_NullStream_INCLUDED


#ifndef Foundation_Foundation_INCLUDED
#include "Foundation/Foundation.h"
#endif
#ifndef Foundation_UnbufferedStreamBuf_INCLUDED
#include "Foundation/UnbufferedStreamBuf.h"
#endif
#ifndef STD_ISTREAM_INCLUDED
#include <istream>
#define STD_ISTREAM_INCLUDED
#endif
#ifndef STD_OSTREAM_INCLUDED
#include <ostream>
#define STD_OSTREAM_INCLUDED
#endif


Foundation_BEGIN


class Foundation_API NullStreamBuf: public UnbufferedStreamBuf
	/// This stream buffer discards all characters written to it.
	/// Any read operation immediately yields EOF.
{
public:
	NullStreamBuf();
		/// Creates a NullStreamBuf.
	
	~NullStreamBuf();
		/// Destroys the NullStreamBuf.
		
protected:
	int readFromDevice();
	int writeToDevice(char c);
};


class Foundation_API NullIOS: public virtual std::ios
	/// The base class for NullInputStream and NullOutputStream.
	///
	/// This class is needed to ensure the correct initialization
	/// order of the stream buffer and base classes.
{
public:
	NullIOS();
	~NullIOS();

protected:
	NullStreamBuf _buf;
};


class Foundation_API NullInputStream: public NullIOS, public std::istream
	/// Any read operation from this stream immediately
	/// yields EOF.
{
public:
	NullInputStream();
		/// Creates the NullInputStream.

	~NullInputStream();
		/// Destroys the NullInputStream.
};


class Foundation_API NullOutputStream: public NullIOS, public std::ostream
	/// This stream discards all characters written to it.
{
public:
	NullOutputStream();
		/// Creates the NullOutputStream.
	
	~NullOutputStream();
		/// Destroys the NullOutputStream.
};


Foundation_END


#endif // Foundation_NullStream_INCLUDED