On Aug 5, 2014, at 3:53 AM, "Luiz Henrique de
Figueiredo" <
lhf@tecgraf.puc-rio.br>
wrote:
>> 3) I wish __call were respected if you give
the function type a
>> metatable, and basic C operations were
exposed to Lua, like
>> getmetatable(0).__add = <C function to add
2 numbers>
>
> A central point in Lua semantics is that
metamethods correspond to
> events that Lua cannot handle. (Metamethods were
originally called
> fallbacks, for this reason.) Addition of two
numbers is not such an
> event and it is never performed via a metamethod,
even if you define one:
>
> Lua 5.2.3 Copyright (C) 1994-2013 Lua.org,
PUC-Rio
> > debug.setmetatable(0,{__add=print})
> > a=1
> > b=2
> > =a+b
> 3
> ... but this works:
> > debug.setmetatable(0,{__call=print})
> > a(10,20,30)
> 1 10 20 30
>