Re: I need example of c++ function for postgres

Have a look at http://www.postgresql.org/docs/7.3/interactive/xfunc-c.html
You'll almost certainly want to extern "c" any routines you want to call
from postgres (this'll stop C++ name mangaling).
Also this is the pgsql-cygwin list, meant for the cygwin MS Windows version
of postgres.
I suspect you'll probably find more help on pgsql-general(at)postgresql(dot)org
hth,
- Stuart
P.S. Sorry about the format change, the disclaimer adder forces it :(

> -----Original Message-----
> From: Yuriy Rusinov [mailto:rusinov(at)quasar(dot)ipa(dot)nw(dot)ru]
> Sent: 08 July 2003 13:00
> To: pgsql-cygwin(at)postgresql(dot)org
> Subject: [CYGWIN] I need example of c++ function for postgres
>
>
> Hello, everyone !
>
> I have developed function for postgresql, compile it, make
> .so-file and
> when I try to link this function to a database it was an
> error "Cannot
> find function weight_ave in <file>.so". Here is code of this function:
>
> weight_ave.h :
>
> #ifndef _WEIGHTAVE_H
> #define _WEIGHTAVE_H
>
> double weight_ave (const double* const w, const double* const
> x, int n);
>
> #endif
>
> weight_ave.cpp:
>
> #include "weight_ave.h"
>
> double weight_ave (const double* const w, const double* const
> x, int n)
> {
> double sumx=0.0;
> double sumw=0.0;
> for (int i=0; i<n; i++)
> {
> sumx+=w[i]*x[i];
> sumw+=w[i];
> }
> return sumx/sumw;
> }
>
> what files I have to include and which way I have to declare this
> function on include.
>
> Best regards,
> Sincerely yours,
> Yuriy Rusinov.

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