Sorry to bother with this questions... What I am trying to do is: Share MAP objects between several process, the map I need to share is something like this: map<string, Employee> myMap; String is the key and the value has to be a custom class or a struct... I tried this but I got lots of errors: struct Employee { std::string name; int age; }; managed_shared_memory segment(create_only, "MySharedMemory", 65536); typedef std::pair<boost::interprocess::basic_string, Employee> ValueType; typedef allocator<ValueType, managed_shared_memory::segment_manager> ShMemAllocator; typedef map<StrAllocator, EmpAllocator, NULL, ShMemAllocator> MyMap; ShMemAllocator alloc_inst (segment.get_segment_manager()); MyMap m*mymap = segment.construct<MyMap>("MyMap")(alloc_inst); //to insert just one value: Employee John; john.name = "Johnny"; john.age = 25; mymap->insert(std::pair<"Hello", john>(boost::interprocess::basic_string, Employee); Actually I don't know what other path should I take on this... Could anyone please help me fix this portion of code? Thank you very much. Dann