I'm interested if it's possible to use functions from some module without
explicitly importing it. In ghci it's done on the fly, like this:
Prelude Data.Map.empty
Loading package array-0.3.0.2 ... linking ... done.
Loading package containers-0.4.0.0 ... linking ... done.
fromList []
But without
Hello,
assuming you mean avoiding the import of Data.Map in the module *using* x, you
can use name quotations:
A.hs:
{-# LANGUAGE TemplateHaskell #-}
module A where
import Data.Map
import Language.Haskell.TH
x = varE 'empty
B.hs:
{-# LANGUAGE TemplateHaskell #-}
module B
| To: Jeff Heard
| Cc: haskell
| Subject: Re: [Haskell-cafe] Template Haskell question
|
| On Wed, Jan 7, 2009 at 12:58 PM, Jeff Heard jefferson.r.he...@gmail.com
wrote:
| And how do I encode
|
| a{ mousePositionf = b }
|
| in template haskell without using the [| |] syntax, so that I can use
It doesn't typecheck, no, but it also doesn't check out in scope. It
complains in
[FunD 'mousePosition [| mousePositionf |] ...
that mousePositionf isn't in scope.
What I believe I need to do is use mkName mousePositionf, but how do
I bind the record getter mousePositionf that is defined by
On Wed, Jan 7, 2009 at 12:58 PM, Jeff Heard jefferson.r.he...@gmail.com wrote:
And how do I encode
a{ mousePositionf = b }
in template haskell without using the [| |] syntax, so that I can use mkName?
Whenever I have a question like that, I just ask ghci:
$ ghci -fth
ghci :m
On Wed, Jan 7, 2009 at 8:54 PM, Ryan Ingram ryani.s...@gmail.com wrote:
You can also use $() and [| |] inside [| |] to generate additional
data in TH directly:
ghci runQ $ do { VarE n - [| runIdentity |] ; [| \x - $(recUpdE [|
x |] [ fmap (\e - (n,e)) [| 1 |] ]) |] }
LamE [VarP x_2]
Alright... I *think* I'm nearly there, but I can't figure out how to
derive a class instance using record accessors and updaters... Can
anyone help? There are [| XXXf |] instances at the end of the module
and they all need replaced, but I can't figure out what to replace
them with. The basic
On 6 jan 2009, at 18:08, Jeff Heard wrote:
Alright... I *think* I'm nearly there, but I can't figure out how to
derive a class instance using record accessors and updaters... Can
anyone help? There are [| XXXf |] instances at the end of the module
and they all need replaced, but I can't
Jeff Heard schrieb:
Alright... I *think* I'm nearly there, but I can't figure out how to
derive a class instance using record accessors and updaters...
Has this something to do with
http://hackage.haskell.org/cgi-bin/hackage-scripts/package/data-accessor-template
?
]
[mailto:[EMAIL PROTECTED] On Behalf Of
| Jeremy Shaw
| Sent: 11 February 2004 16:44
| To: Per Larsson
| Cc: [EMAIL PROTECTED]
| Subject: Re: [Haskell-cafe] Template Haskell question?
|
| Hello,
|
| I had very similar problems due to bugs in 6.2 that are fixed in cvs
head. If you build ghc out
I have written a small TH application (module THRecord) which creates update
functions for records. It is intended to be used like this:
import THRecord
data Record = R {...
...
$(THRecord.generateRecordModifiers (reifyDecl Record))
It works great, but only if the splice is
I have written a small TH application (module THRecord) which creates update
functions for records. It is intended to be used like this:
You should probably ask on the Template Haskell mailing list:
http://www.haskell.org/mailman/listinfo/template-haskell
--KW 8-)
--
Keith Wansbrough [EMAIL
Hello,
I had very similar problems due to bugs in 6.2 that are fixed in cvs head. If you
build ghc out of cvs head that may fix your problem. If not, you can report the bug on
the [EMAIL PROTECTED] mailing list.
Jeremy Shaw.
On Feb 11, 2004 01:39 AM, Per Larsson [EMAIL PROTECTED] wrote:
I
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