is there a possibility to put something like this into the shared_memory?

class A { int a; double d; // ... boost::interprocess string s; }

I need to save classes in the managed_shared_memory that contain strings and vectors and all that stuff. So the general way to put a string into the shared_mem is like this: typedef boost::interprocess::allocator CharAllocator; typedef boost::interprocess::basic_string string; string *s = managed_shm.find_or_construct<string>("String")("bla", managed_shm.get_segment_manager()); So I now want to save a class that contains a string. Therefore I wanted to use a class like this: class A { public: A(boost::interprocess::managed_shared_memory::segment_manager *seg) : calloc(seg), s(calloc) {}; CharAllocator calloc; string s; } and then I wanted to do something like this: A *a = managed_shm.find_or_construct<A>("name")(managed_shm.get_segment_manager()); //to save in the shared_mem BUT for some reason the = operator of allocator is private. The first question is now if there is a general way to save a class like this in the shared_memory. And if so, the second question is how I can create an instance of this class that does _not_ allocate memory from the shared_memory (for purposes of the process that writes to the shared_mem). To write to the shared_mem I just want to say: (*a) = anotherA; where anotherA is an instance from A that does not allocate memory from the shared memory. I hope it is not too confusing. Thanks in advance Best regards, Moritz