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76 lines
1.3 KiB
C++
76 lines
1.3 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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// SPDX-License-Identifier: BSL-1.0
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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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