mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-04 21:42:39 +00:00
76 lines
1.3 KiB
C++
76 lines
1.3 KiB
C++
|
//
|
||
|
|
// Void.h
|
||
|
|
//
|
||
|
|
// $Id: //poco/1.4/Foundation/include/Poco/Void.h#1 $
|
||
|
|
//
|
||
|
|
// Library: Foundation
|
||
|
|
// Package: Core
|
||
|
|
// Module: Void
|
||
|
|
//
|
||
|
|
// Definition of the Void class.
|
||
|
|
//
|
||
|
|
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
|
||
|
|
// and Contributors.
|
||
|
|
//
|
||
|
|
// SPDX-License-Identifier: BSL-1.0
|
||
|
|
//
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef Foundation_Void_INCLUDED
|
||
|
|
#define Foundation_Void_INCLUDED
|
||
|
|
|
||
|
|
|
||
|
|
#include "Poco/Foundation.h"
|
||
|
|
|
||
|
|
|
||
|
|
namespace Poco {
|
||
|
|
|
||
|
|
|
||
|
|
class Foundation_API Void
|
||
|
|
/// A dummy class with value-type semantics,
|
||
|
|
/// mostly useful as a template argument.
|
||
|
|
///
|
||
|
|
/// This class is typically used together with ActiveMethod,
|
||
|
|
/// if no argument or return value is needed.
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
Void();
|
||
|
|
/// Creates the Void.
|
||
|
|
|
||
|
|
Void(const Void& v);
|
||
|
|
/// Creates the Void from another Void.
|
||
|
|
///
|
||
|
|
/// The philosophical aspects of this operation
|
||
|
|
/// remain undiscussed for now.
|
||
|
|
|
||
|
|
~Void();
|
||
|
|
/// Destroys the Void.
|
||
|
|
|
||
|
|
Void& operator = (const Void& v);
|
||
|
|
/// Assigns another void.
|
||
|
|
|
||
|
|
bool operator ==(const Void& v) const;
|
||
|
|
/// Will return always true due to Voids having no members.
|
||
|
|
|
||
|
|
bool operator !=(const Void& v) const;
|
||
|
|
/// Will return always false due to Voids having no members.
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
inline bool Void::operator ==(const Void& /*v*/) const
|
||
|
|
{
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
inline bool Void::operator !=(const Void& /*v*/) const
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
} // namespace Poco
|
||
|
|
|
||
|
|
|
||
|
|
#endif // Foundation_Void_INCLUDED
|