Re: Recursive functions in Lua 4
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- Subject: Re: Recursive functions in Lua 4
- From: Ignacio Burgueño <ignaciob@...>
- Date: 2009年5月21日 14:35:09 -0300
Rob Kendrick wrote:
Yes. Declare the local variable before assigning to it;
function F()
local G
G = function(value)
if value == 10 then
return "stop"
end
return G(value + 1)
end
print( G(1))
end
Hi Rob. That works in Lua 5.x, but not in Lua 4.
error: cannot access a variable in outer scope;
last token read: `G' at line 7 in file `D:\test4.lua'
In order to access G, I have to write %G
function F()
local G
G = function(value)
if value == 10 then
return "stop"
end
return %G(value + 1)
end
print( G(1))
end
print( F(1) )
assert(not G, "G escaped to the global scope")
but then I get
error: attempt to call a nil value
stack traceback:
1: function `G' at line 7 [file `D:\test4.lua']
2: function `F' at line 10 [file `D:\test4.lua']
3: main of file `D:\test4.lua' at line 13
because when the function gets "closed", G is nil.
I found no other way round than calling G and passing itself as an
argument. Is there any other way around this?
Regards,
Ignacio