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Re: Easier make_unique with deleter function

From: Ville Voutilainen <ville.voutilainen_at_[hidden]>
Date: Mon, 23 Aug 2021 19:56:58 +0300
On Mon, 23 Aug 2021 at 19:32, Phil Endecott via Std-Proposals
<std-proposals_at_[hidden]> wrote:
> Dear Experts,
> I have been contemplating what the easiest current or future
> way to create a unique_ptr with a custom deleter function is.
> For example, libtiff has
> TIFF* TIFFOpen(args);
> void TIFFClose(TIFF*);
> I'd like to be able to write something like:
> auto tiffp = make_unique_with_deleter( TIFFOpen(fn), TIFFClose );
> Of course it can't be quite that simple.

Why not? https://wandbox.org/permlink/6wZezfaxA2GDWi1o

> Fundamentally unique_ptr
> stores the deleter only in the type, which I think means the
> deleter function can only ever be a template parameter:

I don't quite follow. unique_ptr does store a deleter object, not just
its type. It has
http://eel.is/c++draft/unique.ptr.single.ctor#10 for exactly this purpose.

Received on 2021-08-23 11:57:15