mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-15 02:41:59 +00:00
100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
//
|
|
// AbstractDelegate.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: Events
|
|
// Module: AbstractDelegate
|
|
//
|
|
// Implementation of the AbstractDelegate template.
|
|
//
|
|
// Copyright (c) 2006-2011, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_AbstractDelegate_INCLUDED
|
|
#define Foundation_AbstractDelegate_INCLUDED
|
|
|
|
|
|
#include "Poco/Foundation.h"
|
|
|
|
|
|
namespace Poco
|
|
{
|
|
|
|
|
|
template <class TArgs>
|
|
class AbstractDelegate
|
|
/// Base class for Delegate and Expire.
|
|
{
|
|
public:
|
|
AbstractDelegate() { }
|
|
|
|
AbstractDelegate(const AbstractDelegate & /*del*/) { }
|
|
|
|
virtual ~AbstractDelegate() { }
|
|
|
|
virtual bool notify(const void * sender, TArgs & arguments) = 0;
|
|
/// Invokes the delegate's callback function.
|
|
/// Returns true if successful, or false if the delegate
|
|
/// has been disabled or has expired.
|
|
|
|
virtual bool equals(const AbstractDelegate & other) const = 0;
|
|
/// Compares the AbstractDelegate with the other one for equality.
|
|
|
|
virtual AbstractDelegate * clone() const = 0;
|
|
/// Returns a deep copy of the AbstractDelegate.
|
|
|
|
virtual void disable() = 0;
|
|
/// Disables the delegate, which is done prior to removal.
|
|
|
|
virtual const AbstractDelegate * unwrap() const
|
|
/// Returns the unwrapped delegate. Must be overridden by decorators
|
|
/// like Expire.
|
|
{
|
|
return this;
|
|
}
|
|
};
|
|
|
|
|
|
template <>
|
|
class AbstractDelegate<void>
|
|
/// Base class for Delegate and Expire.
|
|
{
|
|
public:
|
|
AbstractDelegate() { }
|
|
|
|
AbstractDelegate(const AbstractDelegate &) { }
|
|
|
|
virtual ~AbstractDelegate() { }
|
|
|
|
virtual bool notify(const void * sender) = 0;
|
|
/// Invokes the delegate's callback function.
|
|
/// Returns true if successful, or false if the delegate
|
|
/// has been disabled or has expired.
|
|
|
|
virtual bool equals(const AbstractDelegate & other) const = 0;
|
|
/// Compares the AbstractDelegate with the other one for equality.
|
|
|
|
virtual AbstractDelegate * clone() const = 0;
|
|
/// Returns a deep copy of the AbstractDelegate.
|
|
|
|
virtual void disable() = 0;
|
|
/// Disables the delegate, which is done prior to removal.
|
|
|
|
virtual const AbstractDelegate * unwrap() const
|
|
/// Returns the unwrapped delegate. Must be overridden by decorators
|
|
/// like Expire.
|
|
{
|
|
return this;
|
|
}
|
|
};
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_AbstractDelegate_INCLUDED
|