37 lines
1.5 KiB
Factor
37 lines
1.5 KiB
Factor
! Copyright (C) 2009 Daniel Ehrenberg
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! See http://factorcode.org/license.txt for BSD license.
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USING: help.syntax help.markup math sequences ;
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IN: math.bits
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ABOUT: "math.bits"
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ARTICLE: "math.bits" "Integer virtual sequences"
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"The " { $vocab-link "math.bits" } " vocabulary implements words that represent a positive integer as a virtual sequence of bits in order of ascending significance, e.g. " { $snippet "{ f f f t }" } " is " { $snippet "8" } "."
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{ $subsections
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bits
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<bits>
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make-bits
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bits>number
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} ;
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HELP: bits
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{ $class-description "Tuple representing a number as a virtual sequence of booleans. The first bit is the least significant bit. Constructors are " { $link <bits> } " or " { $link make-bits } "." } ;
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HELP: <bits>
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{ $values { "number" integer } { "length" integer } { "bits" bits } }
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{ $description "Constructor for a " { $link bits } " tuple." } ;
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HELP: make-bits
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{ $values { "number" integer } { "bits" bits } }
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{ $description "Creates a sequence of " { $link bits } " in ascending significance. Throws an error on negative numbers." }
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{ $examples
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{ $example "USING: math.bits prettyprint arrays ;" "0b1101 make-bits >array ." "{ t f t t }" }
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{ $example "USING: math.bits prettyprint arrays ;" "64 make-bits >array ." "{ f f f f f f t }" }
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} ;
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{ <bits> make-bits } related-words
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HELP: bits>number
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{ $values { "seq" sequence } { "number" integer } }
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{ $description "Converts a sequence of booleans in ascending significance into a number." } ;
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{ make-bits bits>number } related-words
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