struct::set - Procedures for manipulating sets
The ::struct::set namespace contains several useful commands for processing finite sets.
It exports only a single command, struct::set. All functionality provided here can be reached through a subcommand of this command.
Note: As of version 2.2 of this package a critcl based C implementation is available. This implementation however requires Tcl 8.4 to run.
Returns a boolean value indicating if the set is empty (true), or not (false).
Returns an integer number greater than or equal to zero. This is the number of elements in the set. In other words, its cardinality.
Returns a boolean value indicating if the set contains the element item (true), or not (false).
Computes the set containing the union of set1, set2, etc., i.e. "set1 + set2 + ...", and returns this set as the result of the command.
Computes the set containing the intersection of set1, set2, etc., i.e. "set1 * set2 * ...", and returns this set as the result of the command.
Computes the set containing the difference of set1 and set2, i.e. ("set1 - set2") and returns this set as the result of the command.
Computes the set containing the symmetric difference of set1 and set2, i.e. ("(set1 - set2) + (set2 - set1)") and returns this set as the result of the command.
This command is a combination of the methods intersect and difference. It returns a three-element list containing "set1*set2", "set1-set2", and "set2-set1", in this order. In other words, the intersection of the two parameter sets, and their differences.
Returns a boolean value indicating if the two sets are equal (true) or not (false).
The element item is added to the set specified by the variable name in svar. The return value of the command is empty. This is the equivalent of lappend for sets. If the variable named by svar does not exist it will be created.
The element item is removed from the set specified by the variable name in svar. The return value of the command is empty. This is a near-equivalent of lreplace for sets.
All the element of set are added to the set specified by the variable name in svar. The return value of the command is empty. This is like the method include, but for the addition of a whole set. If the variable named by svar does not exist it will be created.
All the element of set are removed from the set specified by the variable name in svar. The return value of the command is empty. This is like the method exclude, but for the removal of a whole set.
Returns a boolean value indicating if the set A is a true subset of or equal to the set B (true), or not (false).
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category struct :: set of the Tcllib Trackers. Please also report any ideas for enhancements you may have for either package and/or documentation.
cardinality, difference, emptiness, exclusion, inclusion, intersection, membership, set, symmetric difference, union
Data structures
Copyright © 2004-2008 Andreas Kupries <[email protected]>