Hi,
I don't understand the problem you're having with aliens. Aliens can be
assigned to slots and there is never any reason to call alien-address and
<alien> unless you need to do address arithmetic.
Slava
On Sat, Aug 30, 2008 at 1:02 AM, Glenn Tarcea <[EMAIL PROTECTED]> wrote:
> Hi,
> Is there a way to override the >>xxx xxx>> accessors?
>
> The reason I ask is I have code in the BerkeleyDB interface I'm working on
> that looks as follows:
>
> : <DB-ENV> ( -- DB-ENV/f )
> [let | err [ 0 <int> ] |
> 0 err db_env_creat err *int [ \ DB-ENV new swap alien-address
> >>dbenv ] db-item-create ] ;
>
> The db_env_creat routine is returning a pointer to a DB_ENV. This gets
> treated as a ALIEN: by factor, and I can't assign that to the >>dbenv write
> accessor (hence the call to alien-address, which ends up necessitating a
> later call like 'dbenv>> <alien>' when I need the value in dbenv). What I
> would like to do is to override >>dbenv to accept a ALIEN: . Or
> alternatively to have the >>dbenv and dbenv>> automatically do the
> translation.
>
> Status:
>
> I have basic operations working for BerkeleyDB. I also have interfaces for
> DB_ENV, DB, Cursors, Sequences, and Transactions. Some of the interfaces are
> touchy and are going through some refactoring. Currently you can open a DB
> and a DB_ENV, write to it, and close it. I'm not real happy with my read
> interface so its going through some changes. The approached I took with the
> interface was to create a separate set of C routines that hide the
> DB_ENV->xxx() calls. It also allows me to place the out parameters at the
> end of the function which allowed me to eliminate a lot of the stack
> shuffling. I took the C interface code from Elephant which is a persistent
> object store for Lisp and modified it for my needs.
>
> Thanks,
>
> Glenn
>
> V. Glenn Tarcea
> [EMAIL PROTECTED]
> Hey brother, can you paradigm?
>
>
>
>
>
>
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