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stack(n) 1.2.1 "Tcl Data Structures"
stack - Create and manipulate stack objects
package require Tcl 8.2
package require struct ?1.3?
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 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 no items on the stack, this command will return
count empty strings.
- 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 no items on the stack, this command will return
count empty strings.
- 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.
graph , matrix , queue , tree