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type Building = | |
{ left : int | |
right : int | |
height : int } | |
let buildings = [] | |
let getHeight building = building.height | |
let getWidth building = building.right - building.left | |
let getArea building = getHeight building * getWidth building | |
type Op = | |
{ map : Building -> int | |
reduce : int -> int -> int | |
zero : int } | |
let maxHeight = | |
{ map = getHeight | |
reduce = | |
(fun l r -> | |
if l < r then l | |
else r) | |
zero = System.Int32.MinValue } | |
let minWidth = | |
{ map = getWidth | |
reduce = | |
(fun l r -> | |
if l > r then l | |
else r) | |
zero = System.Int32.MaxValue } | |
let totalArea = | |
{ map = getArea | |
reduce = (+) | |
zero = 0 } | |
let fs = [ maxHeight; minWidth; totalArea ] | |
// Use the foldBack pattern: | |
// foldBack (extractor >> combiner) elements state | |
let limits = | |
[ for f in fs -> List.foldBack (f.map >> f.reduce) buildings f.zero ] | |
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