Backport Defer class for 2.10

diff --git a/lib/base/defer.hpp b/lib/base/defer.hpp
new file mode 100644 (file)
index 0000000..9290c92
--- /dev/null
+++ b/lib/base/defer.hpp
@@ -0,0 +1,46 @@
+/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
+
+#ifndef DEFER
+#define DEFER
+
+#include <functional>
+#include <utility>
+
+namespace icinga
+{
+
+/**
+ * An action to be executed at end of scope.
+ *
+ * @ingroup base
+ */
+class Defer
+{
+public:
+       inline
+       Defer(std::function<void()> func) : m_Func(std::move(func))
+       {
+       }
+
+       Defer(const Defer&) = delete;
+       Defer(Defer&&) = delete;
+       Defer& operator=(const Defer&) = delete;
+       Defer& operator=(Defer&&) = delete;
+
+       inline
+       ~Defer()
+       {
+               try {
+                       m_Func();
+               } catch (...) {
+                       // https://stackoverflow.com/questions/130117/throwing-exceptions-out-of-a-destructor
+               }
+       }
+
+private:
+       std::function<void()> m_Func;
+};
+
+}
+
+#endif /* DEFER */