Re: [Haskell-beginners] How to use Text.Printf w/ custom types

Which methods? Just doing this should be sufficient: ``` instance PrintfArg YourType where formatArg _ _ = Text.pack "It works (well, nearly)" ``` Baa schrieb am Fr., 24. Nov. 2017 um 14:20 Uhr:

But how to do it if "methods" are not exporting?

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According to

https://hackage.haskell.org/package/base-4.10.0.0/docs/Text-Printf.html#g:2 ,

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you only need to implement `PrintfArg`. There is also an example for `()`.

Baa schrieb am Fr., 24. Nov. 2017 um 13:33 Uhr:

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Hello All!

As I understand to use Text.Printf.printf with custom types or to return result as Text instead of String I must implement some class instances: PrintfType, PrintfArg. But how to do this if they are exported from module as type-names only - without its methods (i.e. not "Printf (..)", but "Printf") ?

I tried to import Text.Printf.Internal but seems that no such submodule...

Any ideas?

=== Best regards, Paul _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners

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