Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Now, are there maintainability issues here? Why would you put create() in UNIVERSAL instead of exporting it, ala use My::Types qw(create);?

If you export the create sub, it would mean that each time you call create, the create function in My/ is called, because it's the create function in the current package. With the UNIVERSAL trick, the create function in My/ is only called once for each class - a second call to create with the same package name as argument is handled by the create package directly. The example program I gave shows this. This is because UNIVERSAL is searched *last*, while the current package is searched *first*, and that's the crucial difference between exporting and using UNIVERSAL.

Also, I would assume that, since you're eval'ing the package, you could have it do inheritance and the like, right?

Uhm, no. As I understood, the problem BrowserUK was having is that his program typically would use a few classes, but those classes would be picked from potentially hundreds. And the memory of those hundreds "skeletons" was a concern. The "eval" trick (which might as well have been a 'require') makes that only packages that are used consume memory. I didn't get the impressions BrowserUKs original approach considered inherited constructors, and I certainly didn't considered it either.


In reply to Re: The costs of packages by Abigail-II
in thread The costs of packages by BrowserUk

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others pondering the Monastery: (3)
As of 2023-03-21 17:10 GMT
Find Nodes?
    Voting Booth?
    Which type of climate do you prefer to live in?

    Results (60 votes). Check out past polls.