1. Restrictive loop variable testing

The Euphoria 4 refman_2.txt manual, under loop variables, says : "The compiler will not allow any assignments to a loop variable" Therefore, the following is illegal: 

-- 
-- test loop variable alteration 
-- 
procedure test() 
        for a = 1 to 19 do 
            a = a + 7 
        end for 
        sprintf("%2d",{a}) 
end procedure 
 
test()

But sometimes I do want to alter the loop variable, typically to do a exit from the loop. Sure, I could have another variable and set that to "a" but thats more lines of code. I understand like in the above example, abuse of the loop variable would lead to a endless loop, but isn't this up to the coder to decide? Just like the "goto" wars, leave the coding style to personal choice, rather than "its for your own good"?

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2. Re: Restrictive loop variable testing

alanjohnoxley said...

"The compiler will not allow any assignments to a loop variable" </eucode>

But sometimes I do want to alter the loop variable ...

A future enhancement planned for the language will allow the coder to use a predeclared loop variable, something like this ... 

-- 
-- test loop variable alteration 
-- 
procedure test() 
    integer a 
    for a = 1 to 19 do 
        a = a + 7 
    end for 
    sprintf("%2d",{a}) 
end procedure

It hasn't been implemented yet as there is some more discussion required.

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