Re: [ZEND-ENGINE-CVS] cvs: ZendEngine2 / zend_compile.c zend_compile.h zend_language_parser.y

At 17:25 09/12/2002, Marcus Börger wrote:At 13:10 09.12.2002, Zeev Suraski wrote:

- Prevent users from putting more restrictions on methods in derived classes

    (i.e., you cannot make a public method private in a derived class, etc.)

I do not like it because it is an error from language design. Visibility is about information hiding and not information showing. Also Stanislav is wrong in his comment about 'is_a' but i will explain in more detailed there soon.

I think that the 'is a' approach is entirely accurate. From a language design point of view, it makes perfect sense. It also happens to be the way Java and C# work, so you can be fairly certain that from an object orientation point of view, it works fine. There's still one outstanding bug to fix (parent class calling a child method instead of its own private method), but other than that, it appears to be the best and most comprehensive solution. Zeev