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/*
* Copyright (C) 2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/Function.h>
#include <wtf/Noncopyable.h>
#include <wtf/WeakPtr.h>
namespace WTF {
template<typename> class Observer;
}
namespace WTF {
template<typename T> struct IsDeprecatedWeakRefSmartPointerException;
template<typename Out, typename... In> struct IsDeprecatedWeakRefSmartPointerException<WTF::Observer<Out(In...)>> : std::true_type { };
}
namespace WTF {
template<typename> class Observer;
template <typename Out, typename... In>
class Observer<Out(In...)> : public CanMakeWeakPtr<Observer<Out(In...)>> {
WTF_MAKE_NONCOPYABLE(Observer);
WTF_MAKE_FAST_ALLOCATED;
public:
Observer(Function<Out(In...)>&& callback)
: m_callback(WTFMove(callback))
{
ASSERT(m_callback);
}
Out operator()(In... in) const
{
ASSERT(m_callback);
return m_callback(std::forward<In>(in)...);
}
private:
Function<Out(In...)> m_callback;
};
}
using WTF::Observer;
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