'\"
'\" Generated from file 'stack\&.man' by tcllib/doctools with format 'nroff'
'\"
.TH "struct::stack" n 1\&.5\&.4 tcllib "Tcl Data Structures"
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.SH NAME
struct::stack \- Create and manipulate stack objects
.SH SYNOPSIS
package require \fBTcl 8\&.5 9\fR
.sp
package require \fBstruct::stack ?1\&.5\&.4?\fR
.sp
\fIstackName\fR \fBoption\fR ?\fIarg arg \&.\&.\&.\fR?
.sp
\fIstackName\fR \fBclear\fR
.sp
\fIstackName\fR \fBdestroy\fR
.sp
\fIstackName\fR \fBget\fR
.sp
\fIstackName\fR \fBgetr\fR
.sp
\fIstackName\fR \fBpeek\fR ?\fIcount\fR?
.sp
\fIstackName\fR \fBpeekr\fR ?\fIcount\fR?
.sp
\fIstackName\fR \fBtrim\fR ?\fInewsize\fR?
.sp
\fIstackName\fR \fBtrim*\fR ?\fInewsize\fR?
.sp
\fIstackName\fR \fBpop\fR ?\fIcount\fR?
.sp
\fIstackName\fR \fBpush\fR \fIitem\fR ?\fIitem\&.\&.\&.\fR?
.sp
\fIstackName\fR \fBsize\fR
.sp
.BE
.SH DESCRIPTION
The \fB::struct\fR namespace contains a commands for processing
finite stacks\&.
.PP
It exports a single command, \fB::struct::stack\fR\&. All functionality
provided here can be reached through a subcommand of this command\&.
.PP
\fINote:\fR As of version 1\&.3\&.3 of this package a critcl based C
implementation is available\&. This implementation however requires Tcl
8\&.4 to run\&.
.PP
The \fB::struct::stack\fR command creates a new stack object with an
associated global Tcl command whose name is \fIstackName\fR\&.  This
command may be used to invoke various operations on the stack\&.  It has
the following general form:
.TP
\fIstackName\fR \fBoption\fR ?\fIarg arg \&.\&.\&.\fR?
\fIOption\fR and the \fIarg\fRs determine the exact behavior of the
command\&.  The following commands are possible for stack objects:
.TP
\fIstackName\fR \fBclear\fR
Remove all items from the stack\&.
.TP
\fIstackName\fR \fBdestroy\fR
Destroy the stack, including its storage space and associated command\&.
.TP
\fIstackName\fR \fBget\fR
Returns the whole contents of the stack as a list, without removing
them from the stack\&.
.TP
\fIstackName\fR \fBgetr\fR
A variant of \fBget\fR, which returns the contents in reversed order\&.
.TP
\fIstackName\fR \fBpeek\fR ?\fIcount\fR?
Return the top \fIcount\fR items of the stack, without removing them from
the stack\&.  If \fIcount\fR is not specified, it defaults to 1\&.  If
\fIcount\fR is 1, the result is a simple string; otherwise, it is a
list\&.  If specified, \fIcount\fR must be greater than or equal to 1\&.
If there are not enoughs items on the stack to fulfull the request,
this command will throw an error\&.
.TP
\fIstackName\fR \fBpeekr\fR ?\fIcount\fR?
A variant of \fBpeek\fR, which returns the items in reversed order\&.
.TP
\fIstackName\fR \fBtrim\fR ?\fInewsize\fR?
Shrinks the stack to contain at most \fInewsize\fR elements and
returns a list containing the elements which were removed\&. Nothing is
done if the stack is already at the specified size, or smaller\&. In
that case the result is the empty list\&.
.TP
\fIstackName\fR \fBtrim*\fR ?\fInewsize\fR?
A variant of \fBtrim\fR which performs the shrinking, but does not
return the removed elements\&.
.TP
\fIstackName\fR \fBpop\fR ?\fIcount\fR?
Return the top \fIcount\fR items of the stack, and remove them
from the stack\&.  If \fIcount\fR is not specified, it defaults to 1\&.
If \fIcount\fR is 1, the result is a simple string; otherwise, it is a
list\&.  If specified, \fIcount\fR must be greater than or equal to 1\&.
If there are not enoughs items on the stack to fulfull the request,
this command will throw an error\&.
.TP
\fIstackName\fR \fBpush\fR \fIitem\fR ?\fIitem\&.\&.\&.\fR?
Push the \fIitem\fR or items specified onto the stack\&.  If more than
one \fIitem\fR is given, they will be pushed in the order they are
listed\&.
.TP
\fIstackName\fR \fBsize\fR
Return the number of items on the stack\&.
.PP
.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 :: stack\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\&.
.PP
When proposing code changes, please provide \fIunified diffs\fR,
i\&.e the output of \fBdiff -u\fR\&.
.PP
Note further that \fIattachments\fR are strongly preferred over
inlined patches\&. Attachments can be made by going to the \fBEdit\fR
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar\&.
.SH KEYWORDS
graph, matrix, queue, tree
.SH CATEGORY
Data structures
