constant for empty prefix set

[Alexander Zubkov]

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.