OpenEuphoria

Re: Declaring a Function Before it is used

• Posted by Pete Lomax <petelomax at blueyonder.co.uk> Oct 29, 2003
• 527 views

On Tue, 28 Oct 2003 18:09:05 -0500, Michelle Rogers
<michellerogers at bellsouth.net> wrote:

>wait a sec...i thought this language was supposed to be EASIER to use...then
>why would you have to go through all of this for a simple "declare a
>function before it's used"?

Actually it really is not so difficult:

integer r_Even					-- extra/instead

integer i

function Odd(integer o)
	if o=0 then return 0 end if
	if o=1 then return 1 end if
--	return Even(o-1)
	return call_func(r_Even,{o-1})	-- extra/instead
end function

function Even(integer e)
	if e=0 then return 1 end if
	if e=1 then return 0 end if
	return Odd(e-1)
end function
r_Even=routine_id("Even")			-- extra/instead

? Odd(3)
?Even(3)
? Odd(2)
?Even(2)

Analysis
=======
You've had to replace the one line "return Even(o-1)" with three:

integer r_Even					-- extra/instead
	return call_func(r_Even,{o-1})	-- extra/instead
r_Even=routine_id("Even")			-- extra/instead


YES, there is a (valid) beef about this in this forum.
However, it works, and Eu is fast(er) because of it.
Is it a major problem?

You decide.

Pete
PS I would also sacrifice a little speed for ease of programming.
However, I'm not walking away over this (minor) issue.
PPS In other languages I believe you have to declare a "prototype", or
worse independently define it in a .h file, sometimes anyway.