Hello

I am trying to build some functions using C language. these functions are mentioned in the postgresql documentation.

http://www.postgresql.org/docs/8.3/interactive/xfunc-c.html

Datum
add_one_float8(PG_FUNCTION_ARGS)
{
/* The macros for FLOAT8 hide its pass-by-reference nature. */
float8 arg = PG_GETARG_FLOAT8(0);

PG_RETURN_FLOAT8(arg + 1.0);
}

PG_FUNCTION_INFO_V1(makepoint);

Datum
makepoint(PG_FUNCTION_ARGS)
{
/* Here, the pass-by-reference nature of Point is not hidden. */
Point *pointx = PG_GETARG_POINT_P(0);
Point *pointy = PG_GETARG_POINT_P(1);
Point *new_point = (Point *) palloc(sizeof(Point));

new_point->x = pointx->x;
new_point->y = pointy->y;

PG_RETURN_POINT_P(new_point);
}

the only function that are work are the one with int32 variable.
the other function bring errors and are not working
any body can give directions

kind regards
ihab

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