constant for empty prefix set

[Alexander Zubkov]

Hi,

Let me remind about this once again.

On Tue, Jan 11, 2022 at 1:10 PM Alexander Zubkov <green at qrator.net> wrote:
>
> Hi,
>
> Let me ping this. I would like to receive a feedback on this (and some
> other my recent) messages.
>
> On Sat, Jan 1, 2022 at 9:45 PM Alexander Zubkov <green at qrator.net> wrote:
> >
> > Hi,
> >
> > I propose to add some constant for empty prefix set, for example (as
> > in the patch):
> > define pfx_empty = [ /empty/ ];
> >
> > It is useful when we define a named prefix list, which we can use
> > somewhere in filters, but this prefix list is generated, for example,
> > and we may need to make it empty. But there is no currently means to
> > create an empty prefix set, as I understand.