Re: PostgreSQL C Language Extension with C++ Code

OK now I have this code:

1: extern "C" { // The C header should go here
2: #include <postgres.h>
3: #include <utils/rel.h>
4: #include <fmgr.h>
5: #include <utils/array.h>
6: #include <utils/builtins.h>
7: #include <catalog/pg_type.h>
8: #include <stdlib.h>
9: #include <stdint.h>
10:
11: PG_MODULE_MAGIC;
12: }
13:
14: // CPP header without extern "C"
15: #include <string>
16: #include <vector>
17: #include <iostream>
18: #include <fstream>
19: #include <seal/seal.h> // external compiled c++ library linked on
running 'make'
20:
21: Datum sum_of_numbers(PG_FUNCTION_ARGS);
22: PG_FUNCTION_INFO_V1(sum_of_numbers);
33:
34: extern "C" { // CPP function
35: int64_t sum_of_numbers(){
36: std::vector<int64_t> numbers {23, 445, 64};
37: auto sum = 0;
38: for (auto &item : numbers){
39: sum += item;
40: }
41: return sum;
42: }
43: }

The error this time for PostgreSQL is:
*ERROR: could not find function information for function "sum_of_numbers"
HINT: SQL-callable functions need an accompanying
PG_FUNCTION_INFO_V1(funcname).
SQL state: 42883*

Thanks,
Tal

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