__eq in metatable for C++ objects?

[ahupowerdns]

Our (PowerDNS) love for luawrapper continues to be grandiose! We've built most of dnsdist on it, and now also the Lua integration in the upcoming Recursor 4.x release, thanks!

To make things really shine, we'd like users to be able to compare two DNSName objects in Lua like this:
if(nameA == nameB) then .. stuff .. end
Where nameA are created with newDN() which returns a DNSName.

I've tried:
d_lw->registerFunction("__eq", &DNSName::operator==);

Which would of course be grand. When I explicitly call it (nameA:__eq(nameB)), it works too. But it is not in the metatable, so nameA==nameB does not call operator==. Unsure what it does call, btw! (perhaps it compares exact object identity?).

I see that I could do it with writeVariable to a specific named Lua-side object, but I don't think I could do this from my (C++ based) newDN() function, since my object need not even have a name yet.

Naively, it looks like registerFunction needs a variant for writing to metatables, but I could be wrong.

Help! :-)

[tomaka]

Unfortunately I stopped using Lua a while ago, so I really don't remember much about all this.

[ahupowerdns]

Ok, thank you for all your great work! As PowerDNS we are pondering taking
over maintenance of a public fork of LuaWrapper, if we do so, would you
consider doing a commit to your README pointing people to our work?

Thanks again!

On Mon, Dec 21, 2015 at 12:39:27PM -0800, tomaka wrote:

Unfortunately I stopped using Lua a while ago, so I really don't remember much about all this.

---

Reply to this email directly or view it on GitHub:
#31 (comment)

[tomaka]

Sure!

I haven't touched any C++ code for the past year or so, and have no plan to go back to this language, so it's not me who is going to maintain this library.

[Habbie]

Hello @tomaka, I am working with @ahupowerdns on PowerDNS. Would you be open to handing over the whole repository (what Github calls 'Transfer ownership' in the repo settings' 'Danger Zone') so the issues and open pulls also become our problem?