1 files changed, 49 insertions, 0 deletions
diff --git a/lib/base/initialize.hpp b/lib/base/initialize.hpp
new file mode 100644
index 0000000..adc995f
--- /dev/null
+++ b/lib/base/initialize.hpp
@@ -0,0 +1,49 @@
+/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
+
+#ifndef INITIALIZE_H
+#define INITIALIZE_H
+
+#include "base/i2-base.hpp"
+#include <functional>
+
+namespace icinga
+{
+
+/**
+ * Priority values for use with the INITIALIZE_ONCE_WITH_PRIORITY macro.
+ *
+ * The values are given in the order of initialization.
+ */
+enum class InitializePriority {
+	CreateNamespaces,
+	InitIcingaApplication,
+	RegisterTypeType,
+	RegisterObjectType,
+	RegisterPrimitiveTypes,
+	RegisterBuiltinTypes,
+	RegisterFunctions,
+	RegisterTypes,
+	EvaluateConfigFragments,
+	Default,
+	FreezeNamespaces,
+};
+
+#define I2_TOKENPASTE(x, y) x ## y
+#define I2_TOKENPASTE2(x, y) I2_TOKENPASTE(x, y)
+
+#define I2_UNIQUE_NAME(prefix) I2_TOKENPASTE2(prefix, __COUNTER__)
+
+bool InitializeOnceHelper(const std::function<void()>& func, InitializePriority priority = InitializePriority::Default);
+
+#define INITIALIZE_ONCE(func)									\
+	namespace { namespace I2_UNIQUE_NAME(io) {							\
+		bool l_InitializeOnce(icinga::InitializeOnceHelper(func));		\
+	} }
+
+#define INITIALIZE_ONCE_WITH_PRIORITY(func, priority)						\
+	namespace { namespace I2_UNIQUE_NAME(io) {							\
+		bool l_InitializeOnce(icinga::InitializeOnceHelper(func, priority));	\
+	} }
+}
+
+#endif /* INITIALIZE_H */