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From: "John Haddon" <jf_haddon@QinetiQ.com>
Newsgroups: comp.lang.ada
Subject: Re: Interfacing ADA to C++ classes with parameters
Date: Thu, 4 Apr 2002 09:18:33 +0100
Organization: QinetiQ
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Date: 2002-04-04T09:18:33+01:00
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Thanks,

The mangled name was test_int_param__1Ai, data can now be passes into the
routine, modified and returned OK.  The reason that I'm trying to do this is
because I need to link to existing C++ code which is class based. Does
anyone know of an automatic tool for defining the binding between ADA and
C++,  C2ADA does not cope with a lot of C++ constructs.


John



"Sergey Koshcheyev" <serko84@hotmail.com> wrote in message
news:a8f1gd$eh8$1@ns.felk.cvut.cz...
> Hi,
>
> The link name you use in pragma Import_Function below is wrong. It
> corresponds to A::test_int_param(void) - try running c++filt and typing
the
> mangled name into it.
>
> You have to figure out the correct link name and use that. Also, are you
> sure that the A'Class argument should be the last in the argument list? I
> would myself expect the "this" pointer to be the first argument, but I
don't
> know the low-level details.
>
> Sergey.
>
> "John Haddon" <jf_haddon@QinetiQ.com> wrote in message
> news:a8ete9$sa8$1@hamble.qinetiq.com...
> > Dear All,
> >
> > I'm having a problem writing an interface to a C++ class in which I want
> to
> > pass a parameter in addition to the object. I attach the package spec,
the
> > main program and the C header file. The interface compiles and links
with
> > the main program EXCEPT for TEST_INT_RET. On linkage, the following
error
> is
> > given:
> >
> > ./ex6d_main.o: In function `ex6d_main__dispatch':
> > C:/PROGRA~1/GNAT/Examples_jfh/ex6d_main.adb:25: undefined reference to
> > `A::test_int_param(void)'
> >
> > Why is this trying to refer to A::test_int_param(void) and not
> > A::test_int_param(integer,void)?
>
> > <snip>
> > -- IS THE FOLLOWING LINE CORRECT?
> >       pragma import_function(test_int_param,"
> > test_int_param__1A",(integer,A'Class),(integer));
> > <snip>
>
>
>