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From: Sean Woods on 6 Mar 2010 06:06
In Tcl8.5 (and available as a package for 8.4) the core introduced the
concept of "dicts." They are essentially nested key/value lists.

If I were to try to pull off your example in 8.5+ I would do it such:

set points {}
dict set points 0 x 10
dict set points 0 y 20
dict set points 0 z 30

proc print_point point {
puts "[dict get $point x] / [dict get $point y] / [dict get $point
z]"
}
print_point [dict get $points 0]
(returns) 10 / 20 / 30

dict set points 0 x 35
print_point [dict get $points 0]
(returns) 35 / 20 / 30

Hope that helps,
Sean "The Hypnotoad" Woods

On Mar 5, 9:54 am, CWS <usmgoldenea...(a)gmail.com> wrote:
> I have a tcl struct that i have created somewhere in my program like
> so:
>
> set array(0.x) 10
> set array(0.y) 20
> set array(0.z) 30
>
> lets say i have 20 of these structs that have been filled with data.
> this array is not going to be global, no need for it. i just need to
> pass it to the appropriate functions when needed.
>
> I want to pass this to a proc and be able to retrieve the data(or
> print it out) but keep getting errors. i would also like to change
> values on the fly so that the original array also changes. I actually
> have this part working...so naturally i am confused as to why i cannot
> access the array when trying to output it to the screen.
>
> Can anyone help? Thanks much in advance.
>
> ***so if i have:***
>
> proc print_array {arr} {
>
> upvar $arr a
>
> #set a(0.x) 25  <---update this value
>
> #puts  "$a(0.x)" <---Error in startup script: can't read "a(0.x)": no
> such element in array while executing "puts "$a(0.x)""
>
> }
>
> and in my main somewhere i have created and filled the array with
> values so i call the proc:
>
> print_array myArray
>
> puts "$myArray(0.x)" <---this prints out the changed value
> successfully from up in the proc.

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