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Return Type Covariance
Issue: 2.4 (March/April 2004)
Author: Charles Yeomans
Author Bio: Charles Yeomans pontificates on REALbasic from Lexington, Kentucky.
Article Description: No description available.
Article Length (in bytes): 5,311
Starting Page Number: 36
Article Number: 2417
Related Link(s): None
Excerpt of article text...
REALbasic 5.5 adds a new language feature,
return type covariance . Despite the technical name, it's easy to grasp by seeing it in use. So let's begin by seeing how return type covariance solves a problem.The Factory Method Pattern
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