Re: local pre-declarations

[Rici Lake <lua@...>]

On 31-Aug-04, at 7:32 PM, Nick Trout wrote:

> You cannot declare functions in Lua. Local values will be concreted in
> the function closure made. If you can't move func2 before func1 you'll
> have to make a global variable that accesses func2. Global variables 
> are
> lazy evaluated so you can set them anytime before you need to use them.
> Local variables are evaluated when they are parsed and the reference
> made concrete.

Not quite; Asko is quite right:

local func1
   -- declares the local func1

local function func2(x) return func1(x + 1) end
  -- uses the local func1

function func1(x) return func2(x - 1) end
  -- assigns a value to the local func1


There was a discussion about this a while ago, iirc, but no-one came
up with a useful suggestion.

By the way, the same situation can occur with tables:

local tableOfFunctions

local function foo(x) return tableOfFunctions[x](42) end

tableOfFunctions.foo = foo