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Abstract type: Difference between revisions
→{{header|Smalltalk}}
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</lang>
=={{header|Smalltalk}}==
A class is declared abtract by responding to the query <tt>isAbstract</tt> with true, and defining the required protocol for subclasses to raise an error notification. Optionally, instance creation can be blocked (but seldom done, as you will hit a subclassResponsibility anyway soon). Typically, the IDE provides a menu function to generate these definitions automatically:
<lang smalltalk>someClass class >> isAbstract
^ true
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