Christian Henning escribió:
Hi there, a colleague of mine is questioning the design decisions in the shared_memory_object class. The assignment operator and copy constructor are private. Why?
Because the class own a unique resource just like a file. Is fstream copyable? No, movable (in c++0x) just like shared_memory_object. What should the copy constructor do? Also the constructor takes a type
instead of a value as the first parameter. In his eyes it makes it very inflexible since the creation of or attaching to shared_memory area has to known at compile time.
Ok, this is debatable, because with move semantics you can write: shared_memory_object obj(create? shared_memory_object(create_only, ...): shared_memory_object(open_only, ...)); or shared_memory_object shm; if(create){ shared_memory_object tmp(create_only); tmp.swap(shm); } else{ shared_memory_object tmp(open_only); tmp.swap(shm); } Best, Ion