|Maintainer||John Goerzen <firstname.lastname@example.org> |
Tools for packing into bins
Written by John Goerzen, email@example.com
This module is designed to solve this type of problem: Given a bunch of
objects of varying sizes, what is the best possible way to pack them into
fixed-size bins? This can be used, for instance, by the datapacker program
to pack files onto CDs or DVDs; by manufacturing environments to pack
physical items into physicl bins; etc.
A description of bin packing algorithms can be found at
| = (Num size, Ord size, Show size, Show obj)|
|=> [size]||The sizes and objects
|-> [(size, obj)]||Either error or results
|-> Either (BinPackerError size obj) [[(size, obj)]]|
The primary type for bin-packing functions.
These functions take a list of size of bins. If every bin is the same size,
you can pass (repeat binSize) to pass an infinite list of bins if the
same size. Any surplus bins will simply be ignored.
|Potential errors returned as Left values by BinPacker functions.
Calling show on this value will produce a nice error message suitable for
|BPTooFewBins [(size, obj)]||Ran out of bins; attached value is the list of objects that don't fit
|BPSizeTooLarge size (size, obj)||Bin size1 exceeded by at least the given object and size
|BPOther String||Other error
|(Eq obj, Num size, Ord size, Show obj) => Eq (BinPackerError size obj)|
|(Num size, Ord size, Read size, Read obj, Show obj) => Read (BinPackerError size obj)|
|(Num size, Ord size, Show size, Show obj) => Show (BinPackerError size obj)|
|(Num size, Ord size, Show size, Show obj) => Error (BinPackerError size obj)|
|Pack objects into bins, preserving order. Objects will be taken from the
input list one by one, and added to each bin until the bin is full. Work will
then proceed on the next bin. No attempt is made to optimize allocations to
bins. This is the simplest and most naive bin-packing algorithm, but
may not make very good use of bin space.
|Pack objects into bins. For each bin, start with the largest objects,
and keep packing the largest object from the remainder until no object can
be found to put in the bin. This is substantially more efficient than
packByOrder, but requires sorting the input.
|Produced by Haddock version 2.6.0|