struct::set - Procedures for manipulating sets

       This document, and the package it describes, will undoubtedly contain bugs and  other  problems.   Please
       report  such in the category struct::set of the TcllibTrackers [http://core.tcl.tk/tcllib/reportlist].
       Please also report any ideas for enhancements you may have for either package and/or documentation.

       When proposing code changes, please provide unifieddiffs, i.e the output of diff-u.

       Note further that attachments are strongly preferred over inlined patches. Attachments  can  be  made  by
       going  to the Edit form of the ticket immediately after its creation, and then using the left-most button
       in the secondary navigation bar.

       Data structures

::struct::setemptyset
              Returns a boolean value indicating if the set is empty (true), or not (false).

       ::struct::setsizeset
              Returns an integer number greater than or equal to zero. This is the number  of  elements  in  the
              set. In other words, its cardinality.

       ::struct::setcontainssetitem
              Returns a boolean value indicating if the set contains the element item (true), or not (false).

       ::struct::setunion ?set1...?
              Computes  the  set containing the union of set1, set2, etc., i.e. "set1 + set2 + ...", and returns
              this set as the result of the command.

       ::struct::setintersect ?set1...?
              Computes the set containing the intersection of set1, set2, etc., i.e. "set1 * set2  *  ...",  and
              returns this set as the result of the command.

       ::struct::setdifferenceset1set2
              Computes the set containing the difference of set1 and set2, i.e. ("set1 - set2") and returns this
              set as the result of the command.

       ::struct::setsymdiffset1set2
              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.

       ::struct::setintersect3set1set2
              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.

       ::struct::setequalset1set2
              Returns a boolean value indicating if the two sets are equal (true) or not (false).

       ::struct::setincludesvaritem
              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.

       ::struct::setexcludesvaritem
              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.

       ::struct::setaddsvarset
              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.

       ::struct::setsubtractsvarset
              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.

       ::struct::setsubsetofAB
              Returns  a boolean value indicating if the set A is a true subset of or equal to the set B (true),
              or not (false).

       Copyright (c) 2004-2008 Andreas Kupries <andreas_kupries@users.sourceforge.net>

tcllib                                                2.2.5                                    struct::set(3tcl)

       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.

       cardinality, difference,  emptiness,  exclusion,  inclusion,  intersection,  membership,  set,  symmetric
       difference, union

       struct::set - Procedures for manipulating sets

       package require Tcl8.59

       package require struct::set?2.2.4?::struct::setemptyset::struct::setsizeset::struct::setcontainssetitem::struct::setunion ?set1...?

       ::struct::setintersect ?set1...?

       ::struct::setdifferenceset1set2::struct::setsymdiffset1set2::struct::setintersect3set1set2::struct::setequalset1set2::struct::setincludesvaritem::struct::setexcludesvaritem::struct::setaddsvarset::struct::setsubtractsvarset::struct::setsubsetofAB

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