struct::stack(n)						Tcl Data Structures						  struct::stack(n)

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NAME

       struct::stack - Create and manipulate stack objects

SYNOPSIS

       package require Tcl  8.4

       package require struct::stack  ?1.5.1?

       stackName option ?arg arg ...?

       stackName clear

       stackName destroy

       stackName get

       stackName getr

       stackName peek ?count?

       stackName peekr ?count?

       stackName trim ?newsize?

       stackName trim* ?newsize?

       stackName pop ?count?

       stackName push item ?item...?

       stackName size

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DESCRIPTION

       The ::struct namespace contains a commands for processing finite stacks.

       It exports a single command, ::struct::stack. All functionality provided here can be reached through a subcommand of this command.

       Note:  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.

       The ::struct::stack command creates a new stack object with an associated global Tcl command whose name is stackName.  This command may	be
       used to invoke various operations on the stack.	It has the following general form:

       stackName option ?arg arg ...?
	      Option and the args determine the exact behavior of the command.	The following commands are possible for stack objects:

       stackName clear
	      Remove all items from the stack.

       stackName destroy
	      Destroy the stack, including its storage space and associated command.

       stackName get
	      Returns the whole contents of the stack as a list, without removing them from the stack.

       stackName getr
	      A variant of get, which returns the contents in reversed order.

       stackName peek ?count?
	      Return  the  top	count  items of the stack, without removing them from the stack.  If count is not specified, it defaults to 1.	If
	      count is 1, the result is a simple string; otherwise, it is a list.  If specified, count 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.

       stackName peekr ?count?
	      A variant of peek, which returns the items in reversed order.

       stackName trim ?newsize?
	      Shrinks the stack to contain at most newsize 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.

       stackName trim* ?newsize?
	      A variant of trim which performs the shrinking, but does not return the removed elements.

       stackName pop ?count?
	      Return the top count items of the stack, and remove them from the stack.	If count is not specified, it defaults to 1.  If count	is
	      1,  the  result  is a simple string; otherwise, it is a list.  If specified, count 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.

       stackName push item ?item...?
	      Push the item or items specified onto the stack.	If more than one item is given, they will be pushed in the order they are listed.

       stackName size
	      Return the number of items on the stack.

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the  category  struct
       :: stack of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may
       have for either package and/or documentation.

KEYWORDS

       graph, matrix, queue, tree

CATEGORY

       Data structures

struct								       1.5.1							  struct::stack(n)