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//
// 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
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