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