aivika-4.0: A multi-paradigm simulation library

CopyrightCopyright (c) 2009-2015, David Sorokin <david.sorokin@gmail.com>
LicenseBSD3
MaintainerDavid Sorokin <david.sorokin@gmail.com>
Stabilityexperimental
Safe HaskellSafe-Inferred
LanguageHaskell2010

Simulation.Aivika.PriorityQueue

Description

Tested with: GHC 7.8.3

An imperative heap-based priority queue.

Synopsis

Documentation

data PriorityQueue a Source

The PriorityQueue type represents an imperative heap-based priority queue.

queueNull :: PriorityQueue a -> IO Bool Source

Test whether the priority queue is empty.

queueCount :: PriorityQueue a -> IO Int Source

Return the number of elements in the priority queue.

newQueue :: IO (PriorityQueue a) Source

Create a new priority queue.

enqueue :: PriorityQueue a -> Double -> a -> IO () Source

Enqueue a new element with the specified priority.

dequeue :: PriorityQueue a -> IO () Source

Dequeue the element with the minimal priority.

queueFront :: PriorityQueue a -> IO (Double, a) Source

Return the element with the minimal priority.

remove :: Eq a => PriorityQueue a -> a -> IO Bool Source

Remove the specified element from the queue and return a computation of the flag indicating whether the element was actually removed.

Note that unlike other functions it has complexity O(n).

removeBy :: PriorityQueue a -> (a -> Bool) -> IO Bool Source

Remove an element satisfying the predicate and return a computation of the flag indicating whether the element was actually removed.

Note that unlike other functions it has complexity O(n).