[Scilab-users] Dot operator on a handle

[Stefan Du Rietz]

Error setting a property of a graphics entity with the dot operator on 
a handle from a calling function

Save these two functions in a file testhandle.sci:



function testhandle(nodot, h_arg)
   if ~exists('nodot') then
     nodot = %f;
   end
   if ~exists('h_arg') then
     h_arg = %f;
   end
   f = scf();
   a = f.children;
   a.user_data = 1;
   if h_arg then
     testhandle2(nodot, a)
   else
     testhandle2(nodot)
   end
endfunction

function testhandle2(nodot, a)
   disp("type(a) = " + string(type(a)))
//pause
   if nodot then
     set(a,"user_data",2);
   else
     a.user_data = 2;
   end
   disp("type(a) = " + string(type(a)))
   delete(f)
endfunction



Load it and and then run it:

-->testhandle(%f)
  type(a) = 9
  type(a) = 17

-->testhandle(%t)
  type(a) = 9
  type(a) = 9

That is, if you use use the dot operator on a handle from a calling 
function to set a property of a graphics entity, like here (the first 
case)

   a.user_data = 2;

the handle (type 9) is changed to an mlist (type 17) but if you change 
the property with the set routine (the second case)

   set(a,"user_data",2);

the handle is kept. It also works with  the dot operator if you send 
the handle as an argument to testhandle2 (see the code above):

-->testhandle(%f, %t)
or
-->testhandle(h_arg=%t)
  type(a) = 9
  type(a) = 9

Is this a known bug or shall I report a new one?

Regards
Stefan