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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

____________________________________________________________________________________________________________

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  imple-mentation implementation
       mentation 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 ele-ments elements
              ments 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://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, matrix, queue, tree

CATEGORY
       Data structures



struct                                              1.5.1                                   struct::stack(n)