Uniface User Forum

Hi Unifacers,

I am using Uniface Lists a lot either in the basic as well as the associative format. So far so good!

But what about structs and Uniface list?

We can put into our proc script code:

1) Constants.
Example:
$myStruct$->Level1->Level2{2}->Level3->$scalar
2) A single variable for each level.
Example:
vVar1 = "Level1"
vVar2 = "Level2{2}"
vVar3 = "Level3"
$myStruct$->"%%vVar1%%%"->"%%vVar2%%%"->"%%vVar3%%%"->$scalar

Do you feel the need to use a list containing the struct path to point to?
Example:
vList = ""
putitem vList, 1, "Level1"
putitem vList, 2, "Level2{2}"
putitem vList, 3, "Level3"
$myStruct$->"%%vList%%%"->$scalar

If this last syntax will be supported some of my routines will become a lot shorter and probably much faster.

I would like to know what other Uniface users feel about it.

Regards,
Gianni

I'd have thought you could build a simple global proc to do this. 

gp_list_struct($mystruct$, vList)→$scalar 

or

v_test_struct=gp_list_struct($mystruct$, vList)

v_test_struct->$scalar

WHere gp_list_struct is something like 

params
	struct p_instruct : IN
	string p_List : IN
endparams
returns struct
variables
	struct v_struct
	string v_index
endvariables

v_struct = p_instruct
forlist v_index in p_List
	v_struct = v_struct->"%%v_index%%%"
endfor
return v_struct
end

regards, 

Iain

Hi Iain,

that's was exactly my first tought...it's not too complex, let's code!

But then going further you need to extend the initial routine to:
- support all struct function available ($scalar, $name, $parent, ...)
- support all possible actions on struct item you are pointing to (insert, update, delete, add at collection end)
- support automatic full path creation

The missing feature in almost all cases is dynamic struct path support: that's why I've decided to ask if there could be interest in such improvement.

Regards,
Gianni