Re: [Haskell-cafe] Why are field selectors functions?

Wouldn't the implementation hiding feature of the *newtype *idiom be broken, if field selectors were not first class functions? For instance, the following code (taken shamelessly from Ch. 10 of *Real World Haskell*): module Parse ( runParser ) where data ParseState = ParseState { string

[Haskell-cafe] Trouble installing haskeline: ExitFailure 139

Has anyone else hit an unexplained *ExitFailure 139* when trying to install the *haskeline* package? Thanks, -db dbanas@dbanas-lap:~/prj$ cabal install -v haskeline Reading available packages... Choosing modular solver. Resolving dependencies... Extracting /home/dbanas/.cabal/packages/ hackage.ha

Re: [Haskell-cafe] Request for help: Recompile of ghc producing "...-ghc7.4.2.so"s, which break project builds.

{snip} *Any thoughts?* Thanks, -db On Saturday, April 27, 2013 6:37:43 AM UTC-7, David Banas wrote: > > Recently, I had to recompile ghc, in order to get the "-dyn" versions of > the standard libraries installed. (The standard Ubuntu 12.10 64-bit Linux > distribution

[Haskell-cafe] Question about Newtype "op()" function arguments.

Hi All, Referring to the following, which is taken from the *Control.Newtype *documentation page: op :: Newtype n o => (o -> n) -> n -> oSource

Re: [Haskell-cafe] Question about Newtype "op()" function arguments.

Ah, so is the idea, then, to use *op()* when `n` wasn't actually constructed formally, but rather "assembled" by the user, so as to match the type of the accessor function normally supplied as the argument to the constructor? On 6/7/2013 4:51 PM, Tom Ellis wrote: > On Fri, Jun 07, 2013 at 04:05:0

[Haskell-cafe] Trouble with `foldl` in composition chain.

When profiling this code: consolidateRPR :: [Sample] -> [Sample] smplUnionRecursRev :: [Sample] -> Sample -> [Sample] sortSamps :: [Sample] -> [Sample] smplSetUnion :: [Sample] -> [Sample] smplSetUnion = consolidateRPR . (foldl smp

Re: [Haskell-cafe] [Haskell-Cafe] Constructive Probability Theory and RandProc's σ-algebras

lease, see in-line below.) Looking forward to much more conversation with you (and others), -db On Jul 3, 2011, at 9:35 AM, Edward Kmett wrote: > On Sun, Jul 3, 2011 at 11:05 AM, David Banas wrote: > v0.4 of `RandProc` has just been posted to Hackage: > http://hackage.haskell.org/packag

[Haskell-cafe] Getting segmentation fault when profiling, despite `-K100M'.

Hi all, I'm trying to profile a mixed language program, in which Haskell is NOT the top layer and does not contain the `main' function. (C is/does.) Is this effort doomed to fail? I'm getting a segmentation fault, as soon as the first Haskell function is called, despite having included `-K100M'

[Haskell-cafe] Failed link to mixed-language shared object.

Hi all, Does this trigger recollection in anyone: dbanas@dbanas-eeepc:~/prj/haskell/AMIParse/trunk$ make ghc -dynamic -o ami_test -L. -lami ami_test.o ./libami.so: undefined reference to `__stginit_haskell98_MarshalArray_' ./libami.so: undefined reference to `__stginit_haskell98_MarshalError_' co

Re: [Haskell-cafe] Failed link to mixed-language shared object.

On Thu, 2011-08-18 at 20:32 -0700, David Banas wrote: > Hi all, > > Does this trigger recollection in anyone: > > dbanas@dbanas-eeepc:~/prj/haskell/AMIParse/trunk$ make > ghc -dynamic -o ami_test -L. -lami ami_test.o > ./libami.so: undefined reference to `__stginit_ha

Re: [Haskell-cafe] Failed link to mixed-language shared object

> ghc -dynamic -o ami_test -L. -lami ami_test.o > ./libami.so: undefined reference to `__stginit_haskell98_MarshalArray_' > ./libami.so: undefined reference to `__stginit_haskell98_MarshalError_' > collect2: ld returned 1 exit status I was able to solve this by changing these lines: impo

Re: [Haskell-cafe] Make shared library - questions

> I'm trying to compile shared library. This library will use as part of > plugin for some program. > If I compile library with option -dynamic my library has links for HS > libraries like libHSbase-4.2.0.2-ghc6.12.3.so and so on. > But program has crashed constantly. > > Is it possible to make s

[Haskell-cafe] Undefined symbol error coming from shared, dynamic library.

Hi all, I'm trying to build a shared, dynamic library for use with a C program. I'm getting an `undefined symbol' error, when I try to run that C program, and was hoping that the last line in the output, below, might mean something to someone. I include the entire output of a `make rebuild' comman