[ZeroBrane Studio] Re: Debugging interoperation with middleclass.lua
- From: Paul K <paul@xxxxxxxxxxxxx>
- To: zerobrane@xxxxxxxxxxxxx
- Date: Wed, 12 Mar 2014 16:22:30 -0700
> Try:
> test = Person()
> print(tostring(test))
> "instance of class Person"
> print(test)
> .../middleclass.lua:66: class Person doesn't implement metamethod '__len'
Hm, both of these work for me. I'm running the latest middleclass from github:
local Person = class('Person')
function Person:initialize(name) self.name = name end
function Person:speak() print('Hi, I am ' .. self.name ..'.') end
print(Person)
local person = Person()
print(person)
print(tostring(person))
-- output
class Person
instance of class Person
instance of class Person
Or am I doing something differently?
Paul.
On Wed, Mar 12, 2014 at 3:57 PM, Rob Probin <rob.probin@xxxxxxxxx> wrote:
>
>
> On 12/03/2014 22:51, Rob Probin wrote:
>>
>>
>>> What do you do to get this error? I tried the following (including the
>>> earlier fix for __serialize):
>>>
>>> local Person = class('Person')
>>> print(#Person)
>>>
>>> And it prints 0 without any errors.
>>>
>> In the remote console, whilst running my code (at a breakpoint)
>> print(#Person) and print(pairs(Person)) work for me as well. But why
>> wouldn't it call the metamethods? (maybe I'm missing something obvious...)
>>
>
> Because it's using the Class metatable not the object metatable....
> e.g. print(Person)
>
> shows: "class Person"
>
> Rather than
>
> "instance of Person"
>
> Try:
> test = Person()
> print(tostring(test))
> "instance of class Person"
> print(test)
> .../middleclass.lua:66: class Person doesn't implement metamethod
> '__len'
>
>
>
>
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