1 files changed, 33 insertions, 0 deletions
diff --git a/vespalib/src/vespa/vespalib/util/unwind_message.h b/vespalib/src/vespa/vespalib/util/unwind_message.h
new file mode 100644
index 00000000000..5133e92742d
--- /dev/null
+++ b/vespalib/src/vespa/vespalib/util/unwind_message.h
@@ -0,0 +1,33 @@
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+#pragma once
+
+#include <vespa/vespalib/stllike/string.h>
+
+namespace vespalib {
+
+/**
+ * This class contains a message that will be printed to stderr if the
+ * object is destructed due to stack unwinding caused by an exception.
+ **/
+class UnwindMessage {
+private:
+    int _num_active;
+    vespalib::string _message;
+public:
+    UnwindMessage(const vespalib::string &msg);
+    UnwindMessage(UnwindMessage &&rhs);
+    UnwindMessage(const UnwindMessage &) = delete;
+    UnwindMessage &operator=(const UnwindMessage &) = delete;
+    UnwindMessage &operator=(UnwindMessage &&) = delete;
+    ~UnwindMessage();
+};
+
+extern UnwindMessage unwind_msg(const char *fmt, ...)
+#ifdef __GNUC__
+        // Add printf format checks with gcc
+        __attribute__ ((format (printf,1,2)))
+#endif
+    ;
+
+} // namespace