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:
stackNameoption ?arg arg ...?
Option and the args
determine the exact behavior of the command. The following commands
are possible for stack objects:
stackNameclear
Remove all items from the stack.
stackNamedestroy
Destroy the stack, including its storage space and associated
command.
stackNamepeek ?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.
stackNamepop ?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.
stackNamepushitem ?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.