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96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
//
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// Void.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/Void.h#1 $
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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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// 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_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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