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



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NAME
       struct::queue - Create and manipulate queue objects

SYNOPSIS
       package require Tcl  8.4

       package require struct::queue  ?1.4.2?

       queueName option ?arg arg ...?

       queueName clear

       queueName destroy

       queueName get ?count?

       queueName peek ?count?

       queueName put item ?item ...?

       queueName unget item

       queueName size

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DESCRIPTION
       The ::struct namespace contains a commands for processing finite queues.

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

       Note: As of version 1.4.1 of this package a critcl based C implementation is available.  This  imple-mentation implementation
       mentation however requires Tcl 8.4 to run.

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

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

       queueName clear
              Remove all items from the queue.

       queueName destroy
              Destroy the queue, including its storage space and associated command.

       queueName get ?count?
              Return the front count items of the queue and remove them from the queue.   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
              in the queue to fulfull the request, this command will throw an error.

       queueName peek ?count?
              Return  the front count items of the queue, without removing them from the queue.  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 in the queue to fulfull the request, this command will throw an error.

       queueName put item ?item ...?
              Put the item or items specified into the queue.  If more than one item is given, they will  be
              added in the order they are listed.

       queueName unget item
              Put  the  item into the queue, at the front, i.e. before any other items already in the queue.
              This makes this operation the complement to the method get.

       queueName size
              Return the number of items in the queue.


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

KEYWORDS
       graph, list, matrix, pool, prioqueue, record, set, skiplist, stack, tree

CATEGORY
       Data structures



struct                                              1.4.2                                   struct::queue(n)