Imported Upstream version 0.13.2+dsfg1

plugins/mac-avcapture/scope-guard.hpp

@@ -0,0 +1,80 @@
+/*
+ * Based on Loki::ScopeGuard
+ */
+
+#pragma once
+
+#include <utility>
+
+namespace scope_guard_util {
+
+template <typename FunctionType>
+class ScopeGuard {
+public:
+	void dismiss() noexcept
+	{
+		dismissed_ = true;
+	}
+
+	explicit ScopeGuard(const FunctionType &fn)
+		: function_(fn)
+	{}
+
+	explicit ScopeGuard(FunctionType &&fn)
+		: function_(std::move(fn))
+	{}
+
+	ScopeGuard(ScopeGuard &&other)
+		: dismissed_(other.dismissed_),
+		  function_(std::move(other.function_))
+	{
+		other.dismissed_ = true;
+	}
+
+	~ScopeGuard() noexcept
+	{
+		if (!dismissed_)
+			execute();
+	}
+
+private:
+	void* operator new(size_t) = delete;
+
+	void execute() noexcept
+	{
+		function_();
+	}
+
+	bool dismissed_ = false;
+	FunctionType function_;
+};
+
+template <typename FunctionType>
+ScopeGuard<typename std::decay<FunctionType>::type>
+make_guard(FunctionType &&fn)
+{
+	return ScopeGuard<typename std::decay<FunctionType>::type>{
+			std::forward<FunctionType>(fn)};
+}
+
+namespace detail {
+
+enum class ScopeGuardOnExit {};
+
+template <typename FunctionType>
+ScopeGuard<typename std::decay<FunctionType>::type>
+operator+(detail::ScopeGuardOnExit, FunctionType &&fn) {
+  return ScopeGuard<typename std::decay<FunctionType>::type>(
+      std::forward<FunctionType>(fn));
+}
+
+}
+
+} // namespace scope_guard_util
+
+#define SCOPE_EXIT_CONCAT2(x, y) x ## y
+#define SCOPE_EXIT_CONCAT(x, y) SCOPE_EXIT_CONCAT2(x, y)
+#define SCOPE_EXIT \
+	auto SCOPE_EXIT_CONCAT(SCOPE_EXIT_STATE, __LINE__) = \
+		::scope_guard_util::detail::ScopeGuardOnExit() + [&]() noexcept
+