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/Function.h | 100 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 Source/WTF/wtf/Function.h (limited to 'Source/WTF/wtf/Function.h') diff --git a/Source/WTF/wtf/Function.h b/Source/WTF/wtf/Function.h new file mode 100644 index 000000000..1c9585623 --- /dev/null +++ b/Source/WTF/wtf/Function.h @@ -0,0 +1,100 @@ +/* + * 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 Function; + +template +class Function { +public: + Function() = default; + Function(std::nullptr_t) { } + + template::value>::type> + Function(CallableType&& callable) + : m_callableWrapper(std::make_unique>(WTFMove(callable))) + { + } + + Out operator()(In... in) const + { + if (m_callableWrapper) + return m_callableWrapper->call(std::forward(in)...); + return Out(); + } + + explicit operator bool() const { return !!m_callableWrapper; } + + template::value>::type> + Function& operator=(CallableType&& callable) + { + m_callableWrapper = std::make_unique>(WTFMove(callable)); + return *this; + } + + Function& operator=(std::nullptr_t) + { + m_callableWrapper = nullptr; + return *this; + } + +private: + class CallableWrapperBase { + WTF_MAKE_FAST_ALLOCATED; + public: + virtual ~CallableWrapperBase() { } + + virtual Out call(In...) = 0; + }; + + template + class CallableWrapper : public CallableWrapperBase { + public: + explicit CallableWrapper(CallableType&& callable) + : m_callable(WTFMove(callable)) + { + } + + CallableWrapper(const CallableWrapper&) = delete; + CallableWrapper& operator=(const CallableWrapper&) = delete; + + Out call(In... in) final { return m_callable(std::forward(in)...); } + + private: + CallableType m_callable; + }; + + std::unique_ptr m_callableWrapper; +}; + +} // namespace WTF + +using WTF::Function; -- cgit v1.2.1