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December 18, 2015 21:49
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Make strings work like printf.
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| 23. Hello, World! |
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| {-# LANGUAGE OverloadedStrings, FlexibleInstances, UndecidableInstances #-} | |
| {-# OPTIONS_GHC -fno-warn-orphans #-} | |
| import Data.String ( IsString(..) ) | |
| import Text.Printf ( PrintfType, printf ) | |
| instance (PrintfType a) => IsString a where | |
| fromString s = printf s | |
| main :: IO () | |
| main = do | |
| let x = 23 :: Int | |
| s = "World!" :: String | |
| "%d. Hello, %s\n" x s |
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The associated blog post is here.