Summer SALE

Incomplete Library Class

Signs and Symptoms

Sooner or later, libraries stop meeting user needs. The only solution to the problem—changing the library—is often impossible since the library is read-only.

Reasons for the Problem

The author of the library hasn’t provided the features you need or has refused to implement them.



  • Reduces code duplication (instead of creating your own library from scratch, you can still piggy-back off an existing one).

When to Ignore

  • Extending a library can generate additional work if the changes to the library involve changes in code.