61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
|
/*
|
||
|
|
* 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;
|
||
|
|
|
||
|
|
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;
|
||
|
|
|