webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

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diff --git a/Source/WTF/wtf/Scope.h b/Source/WTF/wtf/Scope.h
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+/*
+ * 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 <type_traits>
+#include <wtf/StdLibExtras.h>
+
+// Based on http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0052r2.pdf
+
+namespace WTF {
+
+template<typename ExitFunction>
+class ScopeExit final {
+public:
+    template<typename ExitFunctionParameter>
+    explicit ScopeExit(ExitFunctionParameter&& exitFunction)
+        : m_exitFunction(std::forward<ExitFunction>(exitFunction))
+    {
+    }
+
+    ScopeExit(ScopeExit&& other)
+        : m_exitFunction(WTFMove(other.m_exitFunction))
+        , m_executeOnDestruction(std::exchange(other.m_executeOnDestruction, false))
+    {
+    }
+
+    ~ScopeExit()
+    {
+        if (m_executeOnDestruction)
+            m_exitFunction();
+    }
+
+    void release()
+    {
+        m_executeOnDestruction = false;
+    }
+
+    ScopeExit(const ScopeExit&) = delete;
+    ScopeExit& operator=(const ScopeExit&) = delete;
+    ScopeExit& operator=(ScopeExit&&) = delete;
+
+private:
+    ExitFunction m_exitFunction;
+    bool m_executeOnDestruction { true };
+};
+
+template<typename ExitFunction>
+ScopeExit<ExitFunction> makeScopeExit(ExitFunction&& exitFunction)
+{
+    return ScopeExit<ExitFunction>(std::forward<ExitFunction>(exitFunction));
+}
+
+}
+
+using WTF::ScopeExit;
+using WTF::makeScopeExit;