Slash Boxes
NOTE: use Perl; is on undef hiatus. You can read content, but you can't post it. More info will be forthcoming forthcomingly.

All the Perl that's Practical to Extract and Report

use Perl Log In

Log In

[ Create a new account ]

Journal of rob_au (1845)

Monday June 02, 2003
07:20 AM

Discovering Class::Contract

[ #12560 ]
Whilst looking for an existing wheel for an application today, as opposed to writing my own, I came across Class::Contract on CPAN - This module allows for the explicit definition of a class interface in a higher-level pseudo-language which allows for a clear definition of input data and method behaviour. This explicit defintion of syntax for the definition of attributes, methods and class constructors fulfilled my needs perfectly, allowing for a clean module package which provides an easy way of defining multiple accessors for class variables with pre-method validation of supplied parameters.

I did however run into a number of problems in using this module:

  • The first was that the tied array interface which is used for array attributes does not incorporate a SPLICE method. This has meant that when modifying an underlying array object through this class, I have been required to copy the array to a temporary array prior to modification by splice and back to the arry object afterwards.
  • The second problem which I encountered was that under perl 5.005.03 on Solaris, Class::Contract methods failed to return any values. That is, methods defined by the contract method of Class::Contract did not return any values - The same code worked unmodified under perl 5.6.0 on the same machine without issue. When searching through the CPAN Testers results for this module, I could not find any tests performed on a 5.005.03 platform - Whilst outdated, this platform does form the core platform for the production environment for a number of enterprise environments. Perhaps I should set up a test box running 5.005.03?

Overall, I must say though, I really like the concept of implementing a class interface by contract - If only it could write all of my tests for me as well ...

The Fine Print: The following comments are owned by whoever posted them. We are not responsible for them in any way.
More | Login | Reply
Loading... please wait.