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import Data.Exists (Exists, mkExists, runExists) | |
type Circle = {x:: Int, y:: Int, r:: Int} | |
type Rectangle = {x:: Int, y:: Int, w:: Int, h:: Int} | |
drawCircle :: Circle -> String | |
drawCircle c = "This is a circle!" | |
drawRectangle :: Rectangle -> String | |
drawRectangle r = "This is a rectangle!" | |
data Component o = Component { | |
data:: o, | |
draw:: o -> String | |
} | |
aCircle = Component { | |
data: {x: 100, y:100, r: 100}, | |
draw: drawCircle | |
} | |
aRectangle = Component { | |
data: {x:100, y:100, w:100, h:100}, | |
draw: drawRectangle | |
} | |
objects :: Array (Exists Component) | |
objects = [ | |
mkExists aCircle, | |
mkExists aRectangle | |
] | |
drawObject :: (Exists Component) -> String | |
drawObject = runExists (\(Component c) -> c.draw c.data) |
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