Hi all,
Well...somehow I'm a beginner in Haskell. But actually my interest in
Haskell will increase if it is possible to call a haskell function in C++.
Something like GreenCard ( http://www.haskell.org/greencard/ ) simplifying
the task of interfacing Haskell programs to external libraries (usuall
write the C wrapper that calls haskell, then link that to your C++ objects
I think what you're really asking is how to call C from C++
-Dan
2008/4/16 Miguel Lordelo <[EMAIL PROTECTED]>:
> Hi all,
>
> Well...somehow I'm a beginner in Haskell. But actually my interest in
> Haskell will increase i
perhaps
haskell:
foreign export "foo_func" foo :: Int -> IO Int
-- I forget the rest of the syntax here
C++:
extern "C" {
int foo_func(int i);
}
int some_cplusplus_function() {
int bat = 3;
int blah = foo_func(bat);
return blah;
}
Is that all you need to do?
Miguel Lordelo wrote:
Hi
Well Isaac...I became now a little bit smarter then yesterday!!!
I show you the example that I found and on which I´m working with.
File: foo.hs
module Foo where
foreign export ccall foo :: Int -> IO Int
foo :: Int -> IO Int
foo n = return (length (f n))
f :: Int -> [Int]
f 0 = []
f n = n:(f (
Although you could use gcc to link the code I wouldn't recommend it
(mainly for the problems you are currently having)
SImply call GHC to compile both the C and Haskell code. It will take
care of finding the headers and supplying the necessary linker
arguments.
ghc -ffi -c foo.hs myfoo_c.c
BTW
Thanks,
I found on one site how to compile after creating the stub files with GHC:
First step:
*ghc -c -ffi haskell_file.hs*
Second step - here it is important to know and write where are the ghc
libraries:
*gcc -I /usr/local/lib/ghc-5.04.3/include -c C_file.c *
After that it is important to link
if you'd normally be linking using g++, you'll need (IIRC) -lstdc++
added to linking-ghc's command line
Alfonso Acosta wrote:
Although you could use gcc to link the code I wouldn't recommend it
(mainly for the problems you are currently having)
SImply call GHC to compile both the C and Haskell
Evan Laforge wrote:
To threadjack a little bit, I've been interfacing haskell with c++.
It gets awkward when the c++ structures use STL types like string and
vector. Of course those are too complex for haskell to marshal to.
What I've been doing is defining an XMarshal variant of the X c++
clas
> you mean, you hack around with the internal representation of those
> structures? Well, if you want to avoid double-copying, C++ can't access
> Haskell sequences, and Haskell can't access C++ sequences, I guess I don't
> see an alternative.
I don't really mind double copying, but having to dec
you could write a C++ function to marshal a Sequence (or any Container
IIRC, maybe Forward Container) to a vector (or whatever you wanted --
there are choices), and then
okay let's see if I remember C++ well enough
This design has extra copying. but anyway
template
std::vector
container_to_
Hello Miguel,
Friday, April 18, 2008, 7:06:07 PM, you wrote:
you may look into my freearc.org project
overall, nothing complex as far as you got it :) i use
ghc -c c_file.cpp
ghc --make main.hs c_file.o
in order to call from C++ to Haskell or vice versa you should define
function in C++ as hav
Hello Isaac,
Friday, April 18, 2008, 7:27:56 PM, you wrote:
absolutely true! it's required if you use new/delete and other things
supported by c++ RTS
> if you'd normally be linking using g++, you'll need (IIRC) -lstdc++
> added to linking-ghc's command line
> Alfonso Acosta wrote:
>> Although
Hello Don,
Saturday, April 19, 2008, 12:08:11 AM, you wrote:
> Would someone like to summarise the current approaches
> to combining Haskell & C++ on the Haskell wiki, even if just in bullet
> points?
started at
http://haskell.org/haskellwiki/IO_inside#Interfacing_with_foreign_evil
--
Best re
To threadjack a little bit, I've been interfacing haskell with c++.
It gets awkward when the c++ structures use STL types like string and
vector. Of course those are too complex for haskell to marshal to.
What I've been doing is defining an XMarshal variant of the X c++
class, that uses plain c a
qdunkan:
> To threadjack a little bit, I've been interfacing haskell with c++.
> It gets awkward when the c++ structures use STL types like string and
> vector. Of course those are too complex for haskell to marshal to.
>
> What I've been doing is defining an XMarshal variant of the X c++
> class
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