libcamera: utils: Add ScopeExitActions class

The ScopeExitActions class is a simple object that performs
user-provided actions upon destruction. It is meant to simplify cleanup
tasks in error handling paths.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Xavier Roumegue <xavier.roumegue@oss.nxp.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

include/libcamera/base/utils.h

@@ -9,6 +9,7 @@
 
 #include <algorithm>
 #include <chrono>
+#include <functional>
 #include <iterator>
 #include <ostream>
 #include <sstream>
@@ -398,6 +399,18 @@ constexpr std::underlying_type_t<Enum> to_underlying(Enum e) noexcept
 	return static_cast<std::underlying_type_t<Enum>>(e);
 }
 
+class ScopeExitActions
+{
+public:
+	~ScopeExitActions();
+
+	void operator+=(std::function<void()> &&action);
+	void release();
+
+private:
+	std::vector<std::function<void()>> actions_;
+};
+
 } /* namespace utils */
 
 #ifndef __DOXYGEN__