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Article contents:== Outdated egg! This is an egg for CHICKEN 4, the unsupported old release. You're almost certainly looking for [[/eggref/5/llrb-syntax|the CHICKEN 5 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-5.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: egg]] == llrb-syntax A syntax-rules macro expanding into left-leaning red-black tree code. Pure and mutating versions. == Overview A left-leaning red–black (LLRB) tree is a type of self-balancing binary search tree. It is a variant of the red–black tree and guarantees the same asymptotic complexity for operations. [wikipedia]. The macro is independent of data structures used to implement nodes of the trees. Users must pass accessors and a syntax or procedure to update an existing node (for the mutating version) respectively create a fresh node as well as names for the procedures to be defined. == Examples See the llrb-tree egg. == API <syntax> define-llrbtree/positional (FEATURES) UPDATE init-root-node! ;; defined t-lookup ;; defined t-min ;; defined t-fold ;; defined t-for-each ;; defined t-insert ;; defined t-delete ;; defined t-delete-min ;; defined t-empty? ;; defined ;; These syntax is used expand to code for comparision ;; expressions. t-k-eq? ;; key<>node-key "equal" t-eq? ;; node-key<>node-key "equal" t-k-<? ;; key<>node-key "less then" t-<? ;; node<>node "less then" ;; Accessors to the elements of the tree. left right color </syntax> FEATURES: {ordered, pure, leftmost} – configures the generated code. UPDATE The "update*" syntax must accept a node structure and key-value pairs. Keys are color:, left: and right: "update" : If feature "pure" is set, "update" must expand to a newly allocated node, otherwise is MUST expand to a side effect full update of the original node. Description of your changes:

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