At Friday 25 of November 2011 11:49:01 from Lorenzo Marcantonio: > On Fri, Nov 25, 2011 at 01:01:19AM +0400, Vladimir Uryvaev wrote: > > Though accessors it widely used way, they're not self worth feature. > > Especially when they're simply getter/setter. But at least compiler > should be smart enough to inline then. Also slotted object model simply > don't have the concept of access protection (and IMHO they generally > work better).
That's true, but programmer waste a time when write unneeded work. There's also con, that accessor methods do not provide references to members (so you cannot pass it as a writable argument or use RMW operators: += *= etc) > > > Accessors are useful when: > > - Class should re-render (cache, graphic or whatever) on its attribute > > change. - Notifications about changes should be sent to another object. > > - Other attributes should change coherently. > > - I forget. > > - (forgot item) Internal representation is subject to change (i.e. array > vs list vs something else) For POD representation is a matter of member classes. If it is subject to change, underlying classes should provide the same interface. > > > There are two data storage 'paradigms': > > - true object having designed interface with all its internals hidden, > > - plain old data type with free access. > > In most cases it is good to head toward one of them. Accessors are seem > > to be emulation of POD in true object. > > C++ and message passing languages are toward the first. Generics > oriented languages (CLOS and functionals) are toward the second (simply > because objects haven't member functions :D) C++ have them both, as second one has come from C. In (primarily scripting) languages without external access to members, PODs are mainly emulated by associative arrays. -- --- KeyFP: DC07 D4C3 BB33 E596 CF5E CEF9 D4E3 B618 65BA 2B61 _______________________________________________ Mailing list: https://launchpad.net/~kicad-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
