Operations on Stacks/Queues
Functions for interacting with stack and queue data structures
implemented using filehash databases.
push(db, val, ...) mpush(db, vals, ...) pop(db, ...) top(db, ...) isEmpty(db, ...)
db |
an object of class |
val |
an R object |
vals |
a list of R objects |
... |
arguments passed to other methods |
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.
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.
Roger D. Peng rpeng@jhsph.edu
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