[comment {-*- tcl -*-}]
[manpage_begin struct::queue n 1.4.5]
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[moddesc {Tcl Data Structures}]
[titledesc {Create and manipulate queue objects}]
[category {Data structures}]
[require Tcl 8.4]
[require struct::queue [opt 1.4.5]]
[description]
The [namespace ::struct] namespace contains a commands for processing
finite queues.
[para]
It exports a single command, [cmd ::struct::queue]. All functionality
provided here can be reached through a subcommand of this command.
[para]
[emph Note:] As of version 1.4.1 of this package a critcl based C
implementation is available. This implementation however requires Tcl
8.4 to run.
[para]
The [cmd ::struct::queue] command creates a new queue object with an
associated global Tcl command whose name is [emph queueName]. This
command may be used to invoke various operations on the queue. It has
the following general form:
[list_begin definitions]
[call [arg queueName] [cmd option] [opt [arg "arg arg ..."]]]
[arg Option] and the [arg arg]s determine the exact behavior of the
command. The following commands are possible for queue objects:
[call [arg queueName] [cmd clear]]
Remove all items from the queue.
[call [arg queueName] [cmd destroy]]
Destroy the queue, including its storage space and associated command.
[call [arg queueName] [cmd get] [opt "[arg count]"]]
Return the front [arg count] items of the queue and remove them from
the queue. If [arg count] is not specified, it defaults to 1. If
[arg count] is 1, the result is a simple string; otherwise, it is a
list. If specified, [arg count] must be greater than or equal to 1.
If there are not enough items in the queue to fulfull the request,
this command will throw an error.
[call [arg queueName] [cmd peek] [opt "[arg count]"]]
Return the front [arg count] items of the queue, without removing them
from the queue. If [arg count] is not specified, it defaults to 1.
If [arg count] is 1, the result is a simple string; otherwise, it is a
list. If specified, [arg count] must be greater than or equal to 1.
If there are not enough items in the queue to fulfull the request,
this command will throw an error.
[call [arg queueName] [cmd put] [arg item] [opt "[arg "item ..."]"]]
Put the [arg item] or items specified into the queue. If more than
one [arg item] is given, they will be added in the order they are
listed.
[call [arg queueName] [cmd unget] [arg item]]
Put the [arg 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 [method get].
[call [arg queueName] [cmd size]]
Return the number of items in the queue.
[list_end]
[vset CATEGORY {struct :: queue}]
[include ../common-text/feedback.inc]
[manpage_end]
