/* * Copyright (C) 2015-2017 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 #if PLATFORM(COCOA) #include <wtf/Assertions.h> #include <wtf/StdLibExtras.h> namespace WTF { template <typename T> class DispatchPtr; template <typename T> DispatchPtr<T> adoptDispatch(T dispatchObject); // FIXME: Use OSObjectPtr instead when it works with dispatch_data_t on all platforms. template<typename T> class DispatchPtr { public: DispatchPtr() : m_ptr(nullptr) { } explicit DispatchPtr(T ptr) : m_ptr(ptr) { if (m_ptr) dispatch_retain(m_ptr); } DispatchPtr(const DispatchPtr& other) : m_ptr(other.m_ptr) { if (m_ptr) dispatch_retain(m_ptr); } ~DispatchPtr() { if (m_ptr) dispatch_release(m_ptr); } DispatchPtr& operator=(const DispatchPtr& other) { auto copy = other; std::swap(m_ptr, copy.m_ptr); return *this; } DispatchPtr& operator=(std::nullptr_t) { auto ptr = std::exchange(m_ptr, nullptr); if (LIKELY(ptr != nullptr)) dispatch_release(ptr); return *this; } T get() const { return m_ptr; } explicit operator bool() const { return m_ptr; } friend DispatchPtr adoptDispatch<T>(T); private: struct Adopt { }; DispatchPtr(Adopt, T data) : m_ptr(data) { } T m_ptr; }; template <typename T> DispatchPtr<T> adoptDispatch(T dispatchObject) { return DispatchPtr<T>(typename DispatchPtr<T>::Adopt { }, dispatchObject); } } // namespace WTF using WTF::DispatchPtr; using WTF::adoptDispatch; #endif