[Boost-users] was it created or opened when using boost::interprocess::shared_memory_object?

Dear folks, I have been using Boost's Interprocess module for communication between several peer processes.  In particular, I am using the shared_memory_object.  As I was trying to create it with open_or_create_t flag (to ensure it finishes in an atomic operation), I cannot tell whether it was created or it was just opened.  I would like to apply initialization when it was created but use its current information when it was opened. I hope there is a member function that can return this status. Best regards, Gehua Yang