Re: "attempt to compare number with userdata"

["Peter Cawley" <lua@...>]

>From the manual: "

The function getcomphandler defines how Lua chooses a metamethod
for comparison operators.
A metamethod only is selected when both objects
being compared have the same type
and the same metamethod for the selected operation." Hence userdata cannot be compared to non-userdata without modifing the Lua source.

On Mon, Nov 24, 2008 at 1:37 PM, Nikolai Kondrashov <Nikolai.Kondrashov@oktetlabs.ru> wrote:

Hello everybody,

Is there is a reason why I cannot compare a number with userdata? Provided
I have necessary metamethods?

The problem is we're using long-based Lua (on MIPS) and sometimes need to
deal with bigger integers, particularly 64-bit ones - only a few operations.

So I've implemented a simple Lua library in C operating on them. All
arithmetic operations work fine, but comparisons won't, giving "attempt to
compare number with userdata" message.

If there is no reason, then where should I look in Lua sources to fix that?

Sincerely,
Nick