15 lines
602 B
Factor
15 lines
602 B
Factor
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USING: help.markup help.syntax kernel words ;
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IN: classes.singleton
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HELP: SINGLETON:
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{ $syntax "SINGLETON: class"
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} { $values
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{ "class" "a new singleton to define" }
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} { $description
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"Defines a new predicate class whose superclass is " { $link word } ". Only one instance of a singleton may exist because classes are " { $link eq? } " to themselves. Methods may be defined on a singleton."
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} { $examples
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{ $example "USING: singleton kernel io ;" "SINGLETON: foo\nGENERIC: bar ( obj -- )\nM: foo bar drop \"a foo!\" print ;\nfoo bar" "a foo!" }
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} { $see-also
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POSTPONE: PREDICATE:
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} ;
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