29 lines
1.2 KiB
Factor
29 lines
1.2 KiB
Factor
USING: help.syntax help.markup classes layouts ;
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IN: classes.builtin
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ARTICLE: "builtin-classes" "Built-in classes"
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"Every object is an instance of exactly one canonical " { $emphasis "built-in class" } " which defines its layout in memory and basic behavior."
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$nl
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"The set of built-in classes is a class:"
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{ $subsection builtin-class }
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{ $subsection builtin-class? }
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"See " { $link "type-index" } " for a list of built-in classes." ;
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HELP: builtin-class
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{ $class-description "The class of built-in classes." }
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{ $examples
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"The class of arrays is a built-in class:"
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{ $example "USING: arrays classes.builtin prettyprint ;" "array builtin-class? ." "t" }
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"However, an instance of the array class is not a built-in class; it is not even a class:"
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{ $example "USING: classes.builtin prettyprint ;" "{ 1 2 3 } builtin-class? ." "f" }
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} ;
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HELP: builtins
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{ $var-description "Vector mapping type numbers to builtin class words." } ;
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HELP: type>class
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{ $values { "n" "a non-negative integer" } { "class" class } }
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{ $description "Outputs a builtin class whose instances are precisely those having a given pointer tag." }
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{ $notes "The parameter " { $snippet "n" } " must be between 0 and the return value of " { $link num-types } "." } ;
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