Not sure about the other alternative? Are you expecting OpenMAMA C-API to keep track of all GC objects like shared_ptr ? *(Keeping a table of active objects for clean-up at Mama.close() may also add o

I can suggest a possible fix (by adding extra weak_ptr check) while calling Mama.close() that can avoid this problem in C11/C11++ when using shared_ptr. *(assumption is Mama.close() is not called by m