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113 lines
3.1 KiB
C++
113 lines
3.1 KiB
C++
//
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// NullStream.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/NullStream.h#1 $
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//
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// Library: Foundation
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// Package: Streams
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// Module: NullStream
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//
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// Definition of the NullStreamBuf, NullInputStream and NullOutputStream classes.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Foundation_NullStream_INCLUDED
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#define Foundation_NullStream_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/UnbufferedStreamBuf.h"
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#include <istream>
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#include <ostream>
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namespace Poco {
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class Foundation_API NullStreamBuf: public UnbufferedStreamBuf
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/// This stream buffer discards all characters written to it.
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/// Any read operation immediately yields EOF.
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{
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public:
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NullStreamBuf();
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/// Creates a NullStreamBuf.
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~NullStreamBuf();
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/// Destroys the NullStreamBuf.
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protected:
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int readFromDevice();
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int writeToDevice(char c);
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};
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class Foundation_API NullIOS: public virtual std::ios
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/// The base class for NullInputStream and NullOutputStream.
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///
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/// This class is needed to ensure the correct initialization
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/// order of the stream buffer and base classes.
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{
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public:
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NullIOS();
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~NullIOS();
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protected:
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NullStreamBuf _buf;
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};
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class Foundation_API NullInputStream: public NullIOS, public std::istream
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/// Any read operation from this stream immediately
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/// yields EOF.
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{
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public:
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NullInputStream();
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/// Creates the NullInputStream.
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~NullInputStream();
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/// Destroys the NullInputStream.
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};
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class Foundation_API NullOutputStream: public NullIOS, public std::ostream
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/// This stream discards all characters written to it.
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{
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public:
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NullOutputStream();
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/// Creates the NullOutputStream.
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~NullOutputStream();
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/// Destroys the NullOutputStream.
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};
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} // namespace Poco
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#endif // Foundation_NullStream_INCLUDED
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