Common: ScopeGuard -> ScopedGuard

src/common/scoped_guard.h

@@ -0,0 +1,35 @@
+#pragma once
+#include "types.h"
+#include <optional>
+#include <utility>
+
+/// ScopedGuard provides an object which runs a function (usually a lambda) when
+/// it goes out of scope. This can be useful for releasing resources or handles
+/// which do not normally have C++ types to automatically release.
+template<typename T>
+class ScopedGuard final
+{
+public:
+  ALWAYS_INLINE ScopedGuard(T&& func) : m_func(std::forward<T>(func)) {}
+  ALWAYS_INLINE ScopedGuard(ScopedGuard&& other) : m_func(std::move(other.m_func)) { other.m_func = nullptr; }
+  ALWAYS_INLINE ~ScopedGuard() { Invoke(); }
+
+  ScopedGuard(const ScopedGuard&) = delete;
+  void operator=(const ScopedGuard&) = delete;
+
+  /// Prevents the function from being invoked when we go out of scope.
+  ALWAYS_INLINE void Cancel() { m_func.reset(); }
+
+  /// Explicitly fires the function.
+  ALWAYS_INLINE void Invoke()
+  {
+    if (!m_func.has_value())
+      return;
+
+    m_func.value()();
+    m_func.reset();
+  }
+
+private:
+  std::optional<T> m_func;
+};