Send Beginners mailing list submissions to
[email protected]
To subscribe or unsubscribe via the World Wide Web, visit
http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
or, via email, send a message with subject or body 'help' to
[email protected]
You can reach the person managing the list at
[email protected]
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Beginners digest..."
Today's Topics:
1. How to use Text.Printf w/ custom types (Baa)
2. Re: How to use Text.Printf w/ custom types (Norbert Melzer)
3. Re: How to use Text.Printf w/ custom types (Baa)
4. Re: How to use Text.Printf w/ custom types (Norbert Melzer)
5. Re: How to use Text.Printf w/ custom types (David McBride)
----------------------------------------------------------------------
Message: 1
Date: Fri, 24 Nov 2017 14:30:49 +0200
From: Baa <[email protected]>
To: [email protected]
Subject: [Haskell-beginners] How to use Text.Printf w/ custom types
Message-ID: <20171124143049.2cae557e@Pavel>
Content-Type: text/plain; charset=US-ASCII
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
------------------------------
Message: 2
Date: Fri, 24 Nov 2017 12:53:55 +0000
From: Norbert Melzer <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] How to use Text.Printf w/ custom
types
Message-ID:
<CA+bCVssk1iKj=vxUVG-SRXjuNA=rqcke7ylqb2yg-do-cve...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
According to
https://hackage.haskell.org/package/base-4.10.0.0/docs/Text-Printf.html#g:2,
you only need to implement `PrintfArg`. There is also an example for `()`.
Baa <[email protected]> schrieb am Fr., 24. Nov. 2017 um 13:33 Uhr:
> 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
> [email protected]
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://mail.haskell.org/pipermail/beginners/attachments/20171124/722b06e5/attachment-0001.html>
------------------------------
Message: 3
Date: Fri, 24 Nov 2017 15:19:40 +0200
From: Baa <[email protected]>
To: [email protected]
Subject: Re: [Haskell-beginners] How to use Text.Printf w/ custom
types
Message-ID: <20171124151940.2bae3550@Pavel>
Content-Type: text/plain; charset=US-ASCII
But how to do it if "methods" are not exporting?
> According to
> https://hackage.haskell.org/package/base-4.10.0.0/docs/Text-Printf.html#g:2,
> you only need to implement `PrintfArg`. There is also an example for
> `()`.
>
> Baa <[email protected]> schrieb am Fr., 24. Nov. 2017 um 13:33 Uhr:
>
> > 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
> > [email protected]
> > http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
> >
------------------------------
Message: 4
Date: Fri, 24 Nov 2017 13:23:54 +0000
From: Norbert Melzer <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] How to use Text.Printf w/ custom
types
Message-ID:
<CA+bCVstXsHDYKm=vf5w6ehvseeepysqe8ksaa1o8jzecp4w...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Which methods?
Just doing this should be sufficient:
```
instance PrintfArg YourType where
formatArg _ _ = Text.pack "It works (well, nearly)"
```
Baa <[email protected]> schrieb am Fr., 24. Nov. 2017 um 14:20 Uhr:
> But how to do it if "methods" are not exporting?
>
> > According to
> >
> https://hackage.haskell.org/package/base-4.10.0.0/docs/Text-Printf.html#g:2
> ,
> > you only need to implement `PrintfArg`. There is also an example for
> > `()`.
> >
> > Baa <[email protected]> schrieb am Fr., 24. Nov. 2017 um 13:33 Uhr:
> >
> > > 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
> > > [email protected]
> > > http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
> > >
>
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://mail.haskell.org/pipermail/beginners/attachments/20171124/1611c374/attachment-0001.html>
------------------------------
Message: 5
Date: Fri, 24 Nov 2017 08:24:54 -0500
From: David McBride <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] How to use Text.Printf w/ custom
types
Message-ID:
<CAN+Tr41dKRMZskMcdKTT6fD5vY=31j7azf0j5xhcmsqomkj...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
It appears PrintfArg and its methods are fully exported.
On Fri, Nov 24, 2017 at 8:19 AM, Baa <[email protected]> wrote:
> But how to do it if "methods" are not exporting?
>
> > According to
> > https://hackage.haskell.org/package/base-4.10.0.0/docs/
> Text-Printf.html#g:2,
> > you only need to implement `PrintfArg`. There is also an example for
> > `()`.
> >
> > Baa <[email protected]> schrieb am Fr., 24. Nov. 2017 um 13:33 Uhr:
> >
> > > 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
> > > [email protected]
> > > http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
> > >
>
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://mail.haskell.org/pipermail/beginners/attachments/20171124/2750fa6e/attachment.html>
------------------------------
Subject: Digest Footer
_______________________________________________
Beginners mailing list
[email protected]
http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
------------------------------
End of Beginners Digest, Vol 113, Issue 22
******************************************
