c++ struct OO vs class OO [duplicate]

Question

This question already has answers here: Closed 10 years ago. Possible Duplicate: What are the differences between struct and class in C++ class and struct in c++ It looks like that struct can has constructor and destructor and members, and looks very simple, so can we use struct instead class, if not, when shall we use struct with functions when shall we use class ? https://github.com/developmentseed/node-sqlite3/blob/master/src/database.h#L32 struct Baton { uv_work_t request; Database* db; Persistent callback; int status; std::string message; Baton(Database* db_, Handle cb_) : db(db_), status(SQLITE_OK) { db->Ref(); uv_ref(uv_default_loop()); request.data = this; callback = Persistent::New(cb_); } virtual ~Baton() { db->Unref(); uv_unref(uv_default_loop()); callback.Dispose(); } }; struct OpenBaton : Baton { std::string filename; int mode; OpenBaton(Database* db_, Handle cb_, const char* filename_, int mode_) : Baton(db_, cb_), filename(filename_), mode(mode_) {} }; JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

There's absolutely no technical reason to prefer one over the other, but I've noticed a certain convention regarding the use of class or struct. If your datatype is something that is meant to be used by other parts of your program (ie. it's part of the 'interface'), then usually people make it a class to indicate its importance. If the datatype is used only in the implementation of a function or a class and it is not visible outside of a certain scope, then make it a struct. These are some very rought guidelines, but no one will complain if you don't follow them. Edit: In C++ there's no real difference between the two, but other newer languages that are inspired by C++ have actually made struct and class different. In C# and in D, for example, class and struct are both used to define datatypes, but they are not the same: struct is implemented such that it should be used for 'small' types.