Thanks Craig,
I'm trying to compile a very simple test with Visual Studio (2008), but I get
the following errors:
c:\program files\postgresql\8.3\include\server\pg_config_os.h(188) : error
C2011: 'timezone' : 'struct' type redefinition
c:\program files\postgresql\8.3\include\server\pg_config_os.h(188) : see
declaration of 'timezone'
c:\program files\postgresql\8.3\include\server\pg_config_os.h(197) : error
C2011: 'itimerval' : 'struct' type redefinition
c:\program files\postgresql\8.3\include\server\pg_config_os.h(197) : see
declaration of 'itimerval'
c:\program files\postgresql\8.3\include\server\c.h(97) : fatal error C1083:
Cannot open include file: 'libintl.h': No such file or directory
I must be doing something wrong - I don't even have a libintl.h on my drive...
This is my .cpp file:
#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
#endif
#define _USE_32BIT_TIME_T
#include "postgres.h"
#include <string.h>
#include "fmgr.h"
/* by value */
PG_FUNCTION_INFO_V1(add_one);
Datum
add_one(PG_FUNCTION_ARGS)
{
int32 arg = PG_GETARG_INT32(0);
PG_RETURN_INT32(arg + 1);
}
If you can help, that would be wonderful.
Thanks a lot,
George.
> Date: Tue, 10 Mar 2009 02:35:34 +0900
> From: cr...@postnewspapers.com.au
> To: oakm...@hotmail.com
> CC: pgsql-general@postgresql.org
> Subject: Re: [GENERAL] C++ User-defined functions
>
> George Oakman wrote:
>
> > I am trying to write a user-defined function in C++. Most examples are give
> > in plain C. I would be very grafeful for a sample program/code-snippet in
> > C++.
>
> It's just like any other C/C++ code mixing. You must make sure that any
> C-only headers are included within an `extern "C"' block, and declare
> any functions that'll be accessed via dlopen() etc as 'extern "C"' too.
> You may only use POD types, arrays of POD types, and structs of POD
> types (with no methods) in calls to/from C code.
>
> In other words, all PostgreSQL must see is plain C code, but your
> 'extern "C"' functions may call C++ methods and work with C++ objects
> internally.
>
> There's lots more information about this on the Internet. Just look for
> generic resources on calling C from C++ and vice versa.
>
> (I don't *think* there are any issues with libstdc++, though you'd
> probably have to make sure that no other program linked into Pg brings
> in a different version of libstdc++.)
>
> --
> Craig Ringer
>
> --
> Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-general
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