On Thu, 2009-10-01 at 13:00 -0400, John Van Enk wrote:
> Hi Duncan,
>
> Yes, I forgot to leave out that I'd like to see 'size_t' mapped to
> CSize.
>
> As a (dirty) workaround, one can use 'castPtr' as the marshaler when
> dealing with pointers to 'size_t'. I'm a little more concerned about
> FunPtr's (though 'castPtr' still makes the issue go away).
>
> Here's my specific case dealing with function pointers:
Ohhh, if you're dealing with pointers to CSize then it's easy, c2hs
supports that directly. See the c2hs user guide section on the pointer
hook.
{# pointer *size_t as CSizePtr -> CSize #}
This tells c2hs that when it sees a *size_t type in a function argument
or result that it should be imported as Ptr CSize.
It generates a type alias and uses that when it imports functions eg:
{# pointer *size_t as CSizePtr -> CSize #}
foo :: Ptr CSize -> IO ()
foo = {# call foo as raw_foo #}
generates:
type CSizePtr = Ptr (CSize)
foo :: Ptr CSize -> IO ()
foo = raw_foo
foreign import ccall safe "foo.chs.h foo"
raw_foo :: CSizePtr -> IO ()
Duncan
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