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filehash (version 2.2-1)

stackqueue: Operations on Stacks/Queues

Description

Functions for interacting with stack and queue data structures implemented using filehash databases.

Usage

push(db, val, ...)
mpush(db, vals, ...)
pop(db, ...)
top(db, ...)
isEmpty(db, ...)

Arguments

db
an object of class "stack" or "queue"
val
an R object
vals
a list of R objects
...
arguments passed to other methods

Value

  • push and mpush return nothing useful; pop returns a value from the stack/queue and deletes that value from the stack/queue; top returns the "top" value from the stack/queue; isEmpty returns TRUE/FALSE depending on whether the stack/queue is empty or not. Both pop and top signal an error if the stack/queue is empty.

Details

Note that for mpush, if vals is not a list it will be coerced to a list via as.list. Currently, mpush is only implemented for "stack"s.