From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: How to bind this properly, C ** which is an array
Date: Fri, 1 Mar 2019 15:02:48 +0100
Date: 2019-03-01T15:02:48+01:00 [thread overview]
Message-ID: <q5be27$1d8u$1@gioia.aioe.org> (raw)
In-Reply-To: 1bb2318a-eb48-450f-908d-a304b92bd74c@googlegroups.com
On 2019-03-01 14:48, Lucretia wrote:
> Hi,
>
> I'm trying to bind the following struct:
>
> typedef struct mpc_ast_t {
> char *tag;
> char *contents;
> mpc_state_t state;
> int children_num;
> struct mpc_ast_t** children;
> } mpc_ast_t;
>
> I have this:
>
> type ASTs is
> record
> Tag : C.Strings.chars_ptr;
> Contents : C.Strings.chars_ptr;
> State : States;
> Number_Of_Children : C.int;
> Children : System.Address; -- Pointer to a pointer to an array of ASTs.
> end record with
> Convention => C;
>
> Children needs to be accessed in code as a pointer to a pointer to an array of ASTs.
>
> How do I best bind this thing? It's likely going to have to be converted from Address to a particular type using Unchecked_Conversion most likely.
I think you could do it without Unchecked_Conversion:
-- Forward declaration
type ASTs;
type ASTs_Ptr is access all ASTs;
pragma Convention (C, ASTs_Ptr);
-- Flat array of pointers without bounds
type ASTs_Ptr_Array is array (size_t) of ASTs_Ptr;
pragma Convention (C, ASTs_Ptr_Array);
type ASTs_Ptr_Array_Ptr is access all ASTs_Ptr_Array;
pragma Convention (C, ASTs_Ptr_Array_Ptr);
-- Now the type
type ASTs is record
Tag : C.Strings.chars_ptr;
Contents : C.Strings.chars_ptr;
State : States;
Number_Of_Children : C.int;
Children : ASTs_Ptr_Array_Ptr;
end record;
pragma Convention (C, ASTs);
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2019-03-01 14:02 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-01 13:48 How to bind this properly, C ** which is an array Lucretia
2019-03-01 13:54 ` Björn Lundin
2019-03-01 13:59 ` Lucretia
2019-03-01 14:02 ` Dmitry A. Kazakov [this message]
2019-03-01 14:20 ` Lucretia
2019-03-01 19:57 ` Per Sandberg
2019-03-01 20:25 ` Lucretia
2019-03-01 22:02 ` Per Sandberg
2019-03-01 23:42 ` Lucretia
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