PQntuples return type

["Luca Ciciriello" <luca_ciciriello(at)hotmail(dot)com>]

Hi All.
My question is simple: can the function PQntuples returns a negative 
integer? I've found in the PostgreSQL manual the following definition:

Returns the number of rows (tuples) in the query result.
int PQntuples(const PGresult *res);

So, my doubt is: if the return type is int instead of unsigned int, is this 
function testable for negative return values?

Thanks in advance.

Luca

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