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From: Szymon Guz <alpha@skynet.org.pl_WITHOUT>
Newsgroups: comp.lang.ada
Subject: Re: ada binding
Date: Thu, 09 Feb 2006 16:56:32 +0100
Organization: ATMAN
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Date: 2006-02-09T16:56:32+01:00
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Maciej Sobczak napisa=B3(a):
> Szymon Guz wrote:
>=20
>> how to make an Ada binding for a "C++" class using this C layer ?
>=20
> Basically, if the C++ class is not a template, but just plain "classic"=
=20
> OO stuff, then you can write a wrapper around it in C, which will still=
=20
> be OO, but without the syntax sugar of real class. Something along this=
:
>=20
> // an existing C++ class:
> class MyClass
> {
> public:
>     void myFun();
> };
>=20
> // a C wrapper:
> extern "C"
> void * MyClass_new()
> {
>     return new MyClass;
> }
>=20
> extern "C"
> void MyClass_delete(void *p)
> {
>     delete static_cast<MyClass*>(p);
> }
>=20
> extern "C"
> void MyClass_myFun(void *vp)
> {
>     MyClass *mcp =3D static_cast<MyClass*>(vp);
>     mcp->myFun();
> }
>=20
> // and so on.
>=20
> Depending on the level of isolation that you want to achieve and the=20
> level of type safety that you want to retain, hiding the object behind =

> void* might or might not be the best choice, but this is to give you th=
e=20
> idea. Above, MyClass_new, MyClass_delete and MyClass_myFun are plain C =

> functions (you can extract their declarations to separate header file) =

> and you can interface them from just about any sensible language in=20
> existence and from Ada in particular.
>=20
>=20

OK, but what about using the class fields :

class MyClass
{
public:
   int X;
   int *p_X;
}

and what about inheriting this from the class in Ada, is it possible ?

regards
Szymon Guz