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109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
//
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// Void.h
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//
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// $Id: //poco/Main/Foundation/include/Poco/Void.h#3 $
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//
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// Library: Foundation
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// Package: Core
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// Module: Void
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//
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// Definition of the Void class.
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//
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// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// 3. Redistributions in any form must be accompanied by information on
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// how to obtain complete source code for this software and any
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// accompanying software that uses this software. The source code
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// must either be included in the distribution or be available for no
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// more than the cost of distribution plus a nominal fee, and must be
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// freely redistributable under reasonable conditions. For an
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// executable file, complete source code means the source code for all
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// modules it contains. It does not include source code for modules or
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// files that typically accompany the major components of the operating
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// system on which the executable file runs.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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#ifndef Foundation_Void_INCLUDED
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#define Foundation_Void_INCLUDED
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#include "Poco/Foundation.h"
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namespace Poco {
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class Foundation_API Void
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/// A dummy class with value-type semantics,
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/// mostly useful as a template argument.
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///
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/// This class is typically used together with ActiveMethod,
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/// if no argument or return value is needed.
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{
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public:
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Void();
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/// Creates the Void.
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Void(const Void& v);
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/// Creates the Void from another Void.
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///
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/// The philosophical aspects of this operation
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/// remain undiscussed for now.
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~Void();
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/// Destroys the Void.
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Void& operator = (const Void& v);
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/// Assigns another void.
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bool operator ==(const Void& v) const;
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/// Will return always true due to Voids having no members.
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bool operator !=(const Void& v) const;
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/// Will return always false due to Voids having no members.
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};
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inline bool Void::operator ==(const Void& v) const
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{
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return true;
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}
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inline bool Void::operator !=(const Void& v) const
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{
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return false;
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}
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} // namespace Poco
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#endif // Foundation_Void_INCLUDED
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