90 lines
3.1 KiB
Factor
90 lines
3.1 KiB
Factor
IN: deques
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USING: help.markup help.syntax kernel ;
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ARTICLE: "deques" "Dequeues"
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"A deque is a data structure with constant-time insertion and removal of elements at both ends. Dequeue operations are defined in the " { $vocab-link "deques" } " vocabulary."
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$nl
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"Dequeues must be instances of a mixin class:"
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{ $subsection deque }
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"Dequeues must implement a protocol."
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$nl
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"Querying the deque:"
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{ $subsection peek-front }
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{ $subsection peek-back }
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{ $subsection deque-length }
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{ $subsection deque-member? }
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"Adding and removing elements:"
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{ $subsection push-front* }
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{ $subsection push-back* }
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{ $subsection pop-front* }
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{ $subsection pop-back* }
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{ $subsection clear-deque }
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"Working with node objects output by " { $link push-front* } " and " { $link push-back* } ":"
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{ $subsection delete-node }
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{ $subsection node-value }
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"Utility operations built in terms of the above:"
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{ $subsection deque-empty? }
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{ $subsection push-front }
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{ $subsection push-all-front }
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{ $subsection push-back }
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{ $subsection push-all-back }
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{ $subsection pop-front }
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{ $subsection pop-back }
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{ $subsection slurp-deque }
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"When using a deque as a queue, the convention is to queue elements with " { $link push-front } " and deque them with " { $link pop-back } "." ;
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ABOUT: "deques"
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HELP: deque-empty?
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{ $values { "deque" { $link deque } } { "?" "a boolean" } }
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{ $description "Returns true if a deque is empty." }
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{ $notes "This operation is O(1)." } ;
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HELP: push-front
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{ $values { "obj" object } { "deque" deque } }
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{ $description "Push the object onto the front of the deque." }
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{ $notes "This operation is O(1)." } ;
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HELP: push-front*
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{ $values { "obj" object } { "deque" deque } { "node" "a node" } }
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{ $description "Push the object onto the front of the deque and return the newly created node." }
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{ $notes "This operation is O(1)." } ;
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HELP: push-back
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{ $values { "obj" object } { "deque" deque } }
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{ $description "Push the object onto the back of the deque." }
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{ $notes "This operation is O(1)." } ;
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HELP: push-back*
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{ $values { "obj" object } { "deque" deque } { "node" "a node" } }
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{ $description "Push the object onto the back of the deque and return the newly created node." }
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{ $notes "This operation is O(1)." } ;
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HELP: peek-front
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{ $values { "deque" deque } { "obj" object } }
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{ $description "Returns the object at the front of the deque." } ;
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HELP: pop-front
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{ $values { "deque" deque } { "obj" object } }
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{ $description "Pop the object off the front of the deque and return the object." }
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{ $notes "This operation is O(1)." } ;
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HELP: pop-front*
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{ $values { "deque" deque } }
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{ $description "Pop the object off the front of the deque." }
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{ $notes "This operation is O(1)." } ;
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HELP: peek-back
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{ $values { "deque" deque } { "obj" object } }
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{ $description "Returns the object at the back of the deque." } ;
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HELP: pop-back
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{ $values { "deque" deque } { "obj" object } }
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{ $description "Pop the object off the back of the deque and return the object." }
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{ $notes "This operation is O(1)." } ;
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HELP: pop-back*
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{ $values { "deque" deque } }
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{ $description "Pop the object off the back of the deque." }
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{ $notes "This operation is O(1)." } ;
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