Abstract type: Difference between revisions
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→{{header|11l}}: Void
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You can declare a virtual function to not have an implementation by using <code>F.virtual.abstract</code> keyword. A type containing at least one abstract virtual function cannot be instantiated.
<syntaxhighlight lang="11l">T AbstractQueue
F.virtual.abstract enqueue(Int item) ->
T PrintQueue(AbstractQueue)
F.virtual.assign enqueue(Int item) ->
print(item)</syntaxhighlight>
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