31 lines
1.3 KiB
Factor
31 lines
1.3 KiB
Factor
USING: generic help.markup help.syntax kernel kernel.private
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namespaces sequences words arrays help effects math
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layouts classes.private classes compiler.units ;
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IN: classes.intersection
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ARTICLE: "intersections" "Intersection classes"
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"An object is an instance of an intersection class if it is an instance of all of its participants."
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{ $subsections POSTPONE: INTERSECTION: }
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{ $subsections define-intersection-class }
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"Intersection classes can be introspected:"
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{ $subsections class-participants }
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"The set of intersection classes is a class:"
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{ $subsections
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intersection-class
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intersection-class?
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}
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"Intersection classes are used to associate a method with objects which are simultaneously instances of multiple different classes, as well as to conveniently define predicates." ;
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ABOUT: "intersections"
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HELP: define-intersection-class
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{ $values { "class" class } { "participants" "a sequence of classes" } }
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{ $description "Defines a intersection class with specified participants. This is the run time equivalent of " { $link POSTPONE: INTERSECTION: } "." }
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{ $notes "This word must be called from inside " { $link with-compilation-unit } "." }
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{ $side-effects "class" } ;
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{ intersection-class define-intersection-class POSTPONE: INTERSECTION: } related-words
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HELP: intersection-class
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{ $class-description "The class of intersection classes." } ;
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