Subclass to alter or add behavior.
recently said that delegation was an alternative to subclassing... I would really like some references on why delegation is a viable/better option.
That seems all fine and dandy. Now, imagine that you have that in 20 places in your code, but in the manager class, someone changes name to full_name. Because the code using the office object was forced to walk through the object heirarchy to get at the data it actually needs, you've created fragile code. Now the manager class must support a name method to be backwards compatible (and we get to start on our big ball of mud), or every reference to it must be changed -- but we've created far too many.
Not too many for :
perl -i.bak -p -e 's/manager->name/manager_fullname/';
also, you might bring up the concept of a Facade
: you might not go changing the object's interface: you could keep the hold and delegate of the old to the new method.
CGI::Application rock the house
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||