'\"
'\" Generated from file 'struct_set\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2004-2008 Andreas Kupries <andreas_kupries@users\&.sourceforge\&.net>
'\"
.TH "struct::set" 3tcl 2\&.2\&.3 tcllib "Tcl Data Structures"
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See the \\*(So manual entry for details on the standard options.
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.BS
.SH NAME
struct::set \- Procedures for manipulating sets
.SH SYNOPSIS
package require \fBTcl  8\&.0\fR
.sp
package require \fBstruct::set  ?2\&.2\&.3?\fR
.sp
\fB::struct::set\fR \fBempty\fR \fIset\fR
.sp
\fB::struct::set\fR \fBsize\fR \fIset\fR
.sp
\fB::struct::set\fR \fBcontains\fR \fIset\fR \fIitem\fR
.sp
\fB::struct::set\fR \fBunion\fR ?\fIset1\fR\&.\&.\&.?
.sp
\fB::struct::set\fR \fBintersect\fR ?\fIset1\fR\&.\&.\&.?
.sp
\fB::struct::set\fR \fBdifference\fR \fIset1\fR \fIset2\fR
.sp
\fB::struct::set\fR \fBsymdiff\fR \fIset1\fR \fIset2\fR
.sp
\fB::struct::set\fR \fBintersect3\fR \fIset1\fR \fIset2\fR
.sp
\fB::struct::set\fR \fBequal\fR \fIset1\fR \fIset2\fR
.sp
\fB::struct::set\fR \fBinclude\fR \fIsvar\fR \fIitem\fR
.sp
\fB::struct::set\fR \fBexclude\fR \fIsvar\fR \fIitem\fR
.sp
\fB::struct::set\fR \fBadd\fR \fIsvar\fR \fIset\fR
.sp
\fB::struct::set\fR \fBsubtract\fR \fIsvar\fR \fIset\fR
.sp
\fB::struct::set\fR \fBsubsetof\fR \fIA\fR \fIB\fR
.sp
.BE
.SH DESCRIPTION
.PP
The \fB::struct::set\fR namespace contains several useful commands for
processing finite sets\&.
.PP
It exports only a single command, \fBstruct::set\fR\&. All
functionality provided here can be reached through a subcommand of
this command\&.
.PP
\fINote:\fR As of version 2\&.2 of this package a critcl based C
implementation is available\&. This implementation however requires Tcl
8\&.4 to run\&.
.SH COMMANDS
.TP
\fB::struct::set\fR \fBempty\fR \fIset\fR
Returns a boolean value indicating if the \fIset\fR is
empty (\fBtrue\fR), or not (\fBfalse\fR)\&.
.TP
\fB::struct::set\fR \fBsize\fR \fIset\fR
Returns an integer number greater than or equal to zero\&. This is the
number of elements in the \fIset\fR\&. In other words, its cardinality\&.
.TP
\fB::struct::set\fR \fBcontains\fR \fIset\fR \fIitem\fR
Returns a boolean value indicating if the \fIset\fR contains the
element \fIitem\fR (\fBtrue\fR), or not (\fBfalse\fR)\&.
.TP
\fB::struct::set\fR \fBunion\fR ?\fIset1\fR\&.\&.\&.?
Computes the set containing the union of \fIset1\fR, \fIset2\fR,
etc\&., i\&.e\&. "\fIset1\fR + \fIset2\fR + \&.\&.\&.", and returns this set
as the result of the command\&.
.TP
\fB::struct::set\fR \fBintersect\fR ?\fIset1\fR\&.\&.\&.?
Computes the set containing the intersection of \fIset1\fR,
\fIset2\fR, etc\&., i\&.e\&. "\fIset1\fR * \fIset2\fR * \&.\&.\&.", and
returns this set as the result of the command\&.
.TP
\fB::struct::set\fR \fBdifference\fR \fIset1\fR \fIset2\fR
Computes the set containing the difference of \fIset1\fR and
\fIset2\fR, i\&.e\&. ("\fIset1\fR - \fIset2\fR") and returns this
set as the result of the command\&.
.TP
\fB::struct::set\fR \fBsymdiff\fR \fIset1\fR \fIset2\fR
Computes the set containing the symmetric difference of \fIset1\fR and
\fIset2\fR, i\&.e\&. ("(\fIset1\fR - \fIset2\fR) + (\fIset2\fR - \fIset1\fR)")
and returns this set as the result of the command\&.
.TP
\fB::struct::set\fR \fBintersect3\fR \fIset1\fR \fIset2\fR
This command is a combination of the methods \fBintersect\fR and
\fBdifference\fR\&.
It returns a three-element list containing "\fIset1\fR*\fIset2\fR",
"\fIset1\fR-\fIset2\fR", and "\fIset2\fR-\fIset1\fR", in this
order\&. In other words, the intersection of the two parameter sets, and
their differences\&.
.TP
\fB::struct::set\fR \fBequal\fR \fIset1\fR \fIset2\fR
Returns a boolean value indicating if the two sets are equal
(\fBtrue\fR) or not (\fBfalse\fR)\&.
.TP
\fB::struct::set\fR \fBinclude\fR \fIsvar\fR \fIitem\fR
The element \fIitem\fR is added to the set specified by the variable
name in \fIsvar\fR\&. The return value of the command is empty\&. This is
the equivalent of \fBlappend\fR for sets\&. If the variable named by
\fIsvar\fR does not exist it will be created\&.
.TP
\fB::struct::set\fR \fBexclude\fR \fIsvar\fR \fIitem\fR
The element \fIitem\fR is removed from the set specified by the
variable name in \fIsvar\fR\&. The return value of the command is
empty\&. This is a near-equivalent of \fBlreplace\fR for sets\&.
.TP
\fB::struct::set\fR \fBadd\fR \fIsvar\fR \fIset\fR
All the element of \fIset\fR are added to the set specified by the
variable name in \fIsvar\fR\&. The return value of the command is
empty\&. This is like the method \fBinclude\fR, but for the addition
of a whole set\&. If the variable named by \fIsvar\fR does not exist it
will be created\&.
.TP
\fB::struct::set\fR \fBsubtract\fR \fIsvar\fR \fIset\fR
All the element of \fIset\fR are removed from the set specified by the
variable name in \fIsvar\fR\&. The return value of the command is
empty\&. This is like the method \fBexclude\fR, but for the removal
of a whole set\&.
.TP
\fB::struct::set\fR \fBsubsetof\fR \fIA\fR \fIB\fR
Returns a boolean value indicating if the set \fIA\fR is a true
subset of or equal to the set \fIB\fR (\fBtrue\fR), or not
(\fBfalse\fR)\&.
.PP
.SH REFERENCES
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIstruct :: set\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.SH KEYWORDS
cardinality, difference, emptiness, exclusion, inclusion, intersection, membership, set, symmetric difference, union
.SH CATEGORY
Data structures
.SH COPYRIGHT
.nf
Copyright (c) 2004-2008 Andreas Kupries <andreas_kupries@users\&.sourceforge\&.net>

.fi