1 files changed, 54 insertions, 0 deletions
diff --git a/lib/base/context.hpp b/lib/base/context.hpp
new file mode 100644
index 0000000..d6fe733
--- /dev/null
+++ b/lib/base/context.hpp
@@ -0,0 +1,54 @@
+/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
+
+#ifndef CONTEXT_H
+#define CONTEXT_H
+
+#include "base/i2-base.hpp"
+#include "base/string.hpp"
+#include <functional>
+#include <vector>
+
+namespace icinga
+{
+
+class ContextTrace
+{
+public:
+	ContextTrace();
+
+	void Print(std::ostream& fp) const;
+
+	size_t GetLength() const;
+
+private:
+	std::vector<String> m_Frames;
+};
+
+std::ostream& operator<<(std::ostream& stream, const ContextTrace& trace);
+
+/**
+ * A context frame.
+ *
+ * @ingroup base
+ */
+class ContextFrame
+{
+public:
+	ContextFrame(std::function<void(std::ostream&)> message);
+	~ContextFrame();
+
+private:
+	static std::vector<std::function<void(std::ostream&)>>& GetFrames();
+
+	friend class ContextTrace;
+};
+
+/* The currentContextFrame variable has to be volatile in order to prevent
+ * the compiler from optimizing it away. */
+#define CONTEXT(message) volatile icinga::ContextFrame currentContextFrame ([&](std::ostream& _CONTEXT_stream) { \
+_CONTEXT_stream << message; \
+})
+
+}
+
+#endif /* CONTEXT_H */