Objects can be created by calls of the form new("stack", ...) or
by calling createS. Existing queues can be initialized with
initS.
Slots
stack:
Object of class "filehashDB1"
name:
Object of class "character": the name of
the stack (default is the file name in which the stack data are
stored)
Methods
isEmpty
signature(db = "stack"): returns
TRUE/FALSE depending on whether there are elements
in the stack.
pop
signature(db = "stack"): returns the value of the
top of the stack and subsequently removes that
element from the stack; an error is signaled if the stack is empty
push
signature(db = "stack"): adds an element to the
top of the stack
show
signature(object = "stack"): prints the name of
the stack
top
signature(db = "stack"): returns the value of the
top of the stack; an error is signaled if the stack
is empty
mpush
signature(db = "stack"): works like push
except it can push multiple objects in a list on to the stack