Common: Add scope_guard.h from Dolphin

src/common/CMakeLists.txt

@@ -53,6 +53,7 @@ add_library(common
   rectangle.h
   progress_callback.cpp
   progress_callback.h
+  scope_guard.h
   state_wrapper.cpp
   state_wrapper.h
   string.cpp

src/common/common.vcxproj

@@ -70,6 +70,7 @@
     <ClInclude Include="progress_callback.h" />
     <ClInclude Include="rectangle.h" />
     <ClInclude Include="cd_subchannel_replacement.h" />
+    <ClInclude Include="scope_guard.h" />
     <ClInclude Include="state_wrapper.h" />
     <ClInclude Include="string.h" />
     <ClInclude Include="string_util.h" />

src/common/common.vcxproj.filters

@@ -67,6 +67,7 @@
     <ClInclude Include="window_info.h" />
     <ClInclude Include="cd_image_hasher.h" />
     <ClInclude Include="dimensional_array.h" />
+    <ClInclude Include="scope_guard.h" />
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="jit_code_buffer.cpp" />

src/common/scope_guard.h

@@ -0,0 +1,41 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <optional>
+
+namespace Common
+{
+template <typename Callable>
+class ScopeGuard final
+{
+public:
+  ScopeGuard(Callable&& finalizer) : m_finalizer(std::forward<Callable>(finalizer)) {}
+
+  ScopeGuard(ScopeGuard&& other) : m_finalizer(std::move(other.m_finalizer))
+  {
+    other.m_finalizer = nullptr;
+  }
+
+  ~ScopeGuard() { Exit(); }
+  void Dismiss() { m_finalizer.reset(); }
+  void Exit()
+  {
+    if (m_finalizer)
+    {
+      (*m_finalizer)();  // must not throw
+      m_finalizer.reset();
+    }
+  }
+
+  ScopeGuard(const ScopeGuard&) = delete;
+
+  void operator=(const ScopeGuard&) = delete;
+
+private:
+  std::optional<Callable> m_finalizer;
+};
+
+}  // Namespace Common