Guys, Where does this old Dino find readable examples in OO programming say in c++? I am trying to learn it.
Regards, Scott On Tue, May 30, 2017 at 10:46 PM David Crayford <dcrayf...@gmail.com> wrote: > On 30/05/2017 9:52 PM, Charles Mills wrote: > > You're trying to scare the poor man! > > > > After I learned OO, I realized the problem in trying to communicate the > concepts. > > > > - The easy-to-grasp explanations are stupid: Animal is a class. Dog and > Cat are child classes of Animal. Fido is an instance of Dog. You could have > an inherited public overridden method Speak() and say myAnimal.Speak() and > if it were a Dog it would bark and if it were a Cat it would Meow ... > > Agreed. Inheritance should generally be avoided anyway. It has it's > place but composition should be preferred 9 times out of 10. Inheritance > is tightly coupled and can become incomprehensible once it gets a few > layers deep. > > > - The real problems that are solved by the significant features are too > hard to explain in a simple tutorial. I solved a problem the other day with > a very sparsely-implemented virtual polymorphic method -- but it would take > me an hour to explain what the problem was. > > Polymorphism is the key principle and you don't need an OO language to > use it. Any language with function pointers can implement polymorphism. > A case in point is the z/OS C stdio runtime which supports many > different types of data source. fopen() is the factory function which > populates the read/write (virtual) function pointers in the FILE > structure. There's no reason why you can't write OO code in assembler. I > see lots of assembler code with constitutional logic littered throughout > which call different functions depending on some type which would > benefit from an OO design. > > > Charles > > > > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] > On Behalf Of David Crayford > > Sent: Tuesday, May 30, 2017 5:23 AM > > To: IBM-MAIN@LISTSERV.UA.EDU > > Subject: Re: Question about C++ > > > > This might bewilder you some more ... > > > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- Scott Ford IDMWORKS z/OS Development ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
