MIME-Version: 1.0
References: 
 <CAGECzQR21OnnKiZO_1rLWO0-16kg1JBxnVq-wymYW0-_1cUNtg@mail.gmail.com>
 <1bec56e5-aef9-4d3b-b4ee-723c6575a44e@eisentraut.org>
In-Reply-To: <1bec56e5-aef9-4d3b-b4ee-723c6575a44e@eisentraut.org>
From: Jelte Fennema-Nio <postgres@jeltef.nl>
Date: Tue, 9 Dec 2025 13:58:40 +0100
Message-ID: 
 <CAGECzQSgRGRRHt4BVhMLpxrXMGDGzFLk3d=rnC7ye2kNibc-AQ@mail.gmail.com>
Subject: Re: Make copyObject work in C++
To: Peter Eisentraut <peter@eisentraut.org>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
	Thomas Munro <thomas.munro@gmail.com>
Content-Type: text/plain; charset="UTF-8"
Archived-At: 
 <https://www.postgresql.org/message-id/CAGECzQSgRGRRHt4BVhMLpxrXMGDGzFLk3d%3DrnC7ye2kNibc-AQ%40mail.gmail.com>
Precedence: bulk

On Mon, 8 Dec 2025 at 08:57, Peter Eisentraut <peter@eisentraut.org> wrote:
> In the long run, I would like to change copyObject() to use
> typeof_unqual instead, because that handles qualifiers more correctly.
> (Currently, copyObject() of a const-qualified pointer results in a
> const-qualified pointer, which is nonsensical because the reason you
> made the copy is that you can modify it.)  See attached patch for an
> example.  Does C++ have something that is semantically similar to that?

Yes, there's a std::remove_cv, std::remove_const, and std::remove_volatile[1].

[1]: https://en.cppreference.com/w/cpp/types/remove_cv.html