Re: allowing multiple PQclear() calls

Simon Riggs <simon@2ndquadrant.com>

From: Simon Riggs <simon@2ndQuadrant.com>
To: Marko Kreen <markokr@gmail.com>
Cc: Josh Kupershmidt <schmiddy@gmail.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2012-12-11T11:45:13Z
Lists: pgsql-hackers
On 11 December 2012 10:39, Marko Kreen <markokr@gmail.com> wrote:
> On Tue, Dec 11, 2012 at 6:59 AM, Josh Kupershmidt <schmiddy@gmail.com> wrote:
>> Would it be crazy to add an "already_freed" flag to the pg_result
>> struct which PQclear() would set, or some equivalent safety mechanism,
>> to avoid this hassle for users?
>
> Such mechanism already exist - you just need to set
> your PGresult pointer to NULL after each PQclear().

So why doesn't PQclear() do that?

Maintaining a pointer to something that no longer exists seems strange.

Under what conditions would anybody want the old pointer value after PQclear() ?

-- 
 Simon Riggs                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services