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- Subject: Re: __mul()
- From: Geoff Leyland <geoff_leyland@...>
- Date: Sun, 21 Mar 2010 15:08:14 +1300
On 21/03/2010, at 3:04 PM, Christopher Eykamp wrote:
> If this works:
>
> newpt = bot:getLoc():__mul(2)
>
> Shouldn't this:
>
> newpt = bot:getLoc() * 2
>
> Instead I get an error: "attempt to perform arithmetic on a userdata value."
>
> Some quick background: bot:getLoc() is a C++ method that returns a pointer to a point stored in C++. I am binding Lua and C++ using Lunar. __mul() is a method added in Lua (I have also tried adding it via C++). How can I get arithmetic methods to work on userdata?
>
> Any ideas?
I know nothing about Lunar, but does
newpt = getmetatable(bot:getLoc()):__mul(2)
work?
Cheers,
Geoff
