[Haskell-beginners] Data.Text to Int?

[Brandon Allbery]

On Fri, Dec 14, 2012 at 9:57 AM, Emmanuel Touzery <etouzery at gmail.com>wrote:

>     I expected "read" to work directly on a Data.Text because Data.Text has
> an instance of the Read class, but it seems to fail:
>

An instance of Read means that read can *produce* a Text, not that it can
consume one.  read always reads from a String, as you can see from its type:

    Prelude Data.Text> :t read
    read :: Read a => String -> a

(Note that it is the result type a in the context for Read.)

See the Data.Text.Read module (part of the text package you already have
installed) for how to do similar things with a Text as a source.

-- 
brandon s allbery kf8nh                               sine nomine associates
allbery.b at gmail.com                                  ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
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