stack-class {filehash}

Stack Class

Description

A stack implementation using a filehash database

Usage

## S4 method for signature 'stack'
show(object)

createS(filename)

initS(filename)

## S4 method for signature 'stack'
push(db, val, ...)

mpush(db, vals, ...)

## S4 method for signature 'stack'
mpush(db, vals, ...)

## S4 method for signature 'stack'
isEmpty(db, ...)

## S4 method for signature 'stack'
top(db, ...)

## S4 method for signature 'stack'
pop(db, ...)

Arguments

object

a stack object

filename

name of file where stack is stored

db

a stack object

val

an R object to be added to the stack

...

arguments passed to other methods

vals

a list of R objects

Details

Objects can be created by calls of the form new("stack", ...) or by calling createS. Existing queues can be initialized with initS.

Value

a stack object

Methods (by generic)

• show(stack): Print a stack object.

• push(stack): Push an object on to the stack

• mpush(stack): Push a list of R objects on to the stack

• isEmpty(stack): Indicate whether the stack is empty or not

• top(stack): Return the top element of the stack

• pop(stack): Return the top element of the stack and remove that element from the stack

Functions

• createS(): Create a filehash Stack

• initS(): Initialize and existing filehash stack

• mpush(): Push multiple R objects on to a stack

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)