#include "postgres.h"
#include "fmgr.h"
 
#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
#endif
 
PG_FUNCTION_INFO_V1(add_one);
 
__declspec (dllexport) Datum add_one(PG_FUNCTION_ARGS)
{
    int32   arg = PG_GETARG_INT32(0);
 
    PG_RETURN_INT32(arg + 1);
}
 
PG_FUNCTION_INFO_V1(fo);
 
__declspec (dllexport) Datum fo(PG_FUNCTION_ARGS)
{
    float8   arg = PG_GETARG_FLOAT8(0);
 
    PG_RETURN_FLOAT8(arg+1);
}

CREATE OR REPLACE FUNCTION "public"."add_one_f"(double precision) RETURN double precision AS
'dll_c.dll','fo'
LANGUAGE C STRICT

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