From 1bf1084f2b10c3b47fd1a588d85d21ed0eb41d0c Mon Sep 17 00:00:00 2001 From: Lorry Tar Creator Date: Tue, 27 Jun 2017 06:07:23 +0000 Subject: webkitgtk-2.16.5 --- Source/WTF/wtf/UniqueRef.h | 79 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 Source/WTF/wtf/UniqueRef.h (limited to 'Source/WTF/wtf/UniqueRef.h') diff --git a/Source/WTF/wtf/UniqueRef.h b/Source/WTF/wtf/UniqueRef.h new file mode 100644 index 000000000..2039950d9 --- /dev/null +++ b/Source/WTF/wtf/UniqueRef.h @@ -0,0 +1,79 @@ +/* + * Copyright (C) 2016 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 +#include + +namespace WTF { + +template class UniqueRef; + +template +UniqueRef makeUniqueRef(Args&&... args) +{ + return UniqueRef(*new T(std::forward(args)...)); +} + +template +class UniqueRef { +public: + template + UniqueRef(UniqueRef&& other) + : m_ref(WTFMove(other.m_ref)) + { + ASSERT(m_ref); + } + + T& get() { ASSERT(m_ref); return *m_ref; } + const T& get() const { ASSERT(m_ref); return *m_ref; } + + T* operator&() { ASSERT(m_ref); return m_ref.get(); } + const T* operator&() const { ASSERT(m_ref); return m_ref.get(); } + + T* operator->() { ASSERT(m_ref); return m_ref.get(); } + const T* operator->() const { ASSERT(m_ref); return m_ref.get(); } + + operator T&() { ASSERT(m_ref); return *m_ref; } + operator const T&() const { ASSERT(m_ref); return *m_ref; } + +private: + template friend UniqueRef makeUniqueRef(Args&&...); + template friend class UniqueRef; + + UniqueRef(T& other) + : m_ref(&other) + { + ASSERT(m_ref); + } + + std::unique_ptr m_ref; +}; + +} // namespace WTF + +using WTF::UniqueRef; +using WTF::makeUniqueRef; -- cgit v1.2.1