In fact, an important assumption must be satisfied for applying such powerful techniques as inheritance, genericity or delayed binding to application development. Many tasks require the collaboration of a group of objects. Redefinition of a partial implementation for efficiency reasons is the only exception. Since such a redefinition must be behaviour preserving, it does, however, not indicate a missing abstraction or an unwanted subclassing pattern. On the other hand, specialization allows for the restriction of a class interface.
Many tasks require the collaboration of a group of objects.
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