How to use setVarWriteProtect to protect a defstruct variable?

eDave said:

Generally variables should be set to be local by including them in a let statement. Local variables cannot be changed by users.

You may have to re-think your code if you want to protect the contents of a global variable. The documentation states that the behavior of this is not specified.

Hi Dave,

  Thanks! Actually that is not a global variable, it(the defstruct variable) is passed as a function parameter.  it might be Skill limitation to write protect a defstruct variable. Not sure...

  Anyway, I will think about other way to protect it.

  Another interesting phenomena I found is that a local variable defined in parent function is visible in its child function.

  Please look at following example, cellName is visible in function testCell(), it can be printed out as "abc" when call function mytest().

  It behaves differently compared with that of C language, and other script language, like Tcl.  Is there any special purpose for SKILL to do so?

 procedure( mytest()
  prog( (cellName)
    cellName = "abc"
    testCell()
  )
)
procedure( testCell()
  prog( ()
    printf("cell name is %s ...\n" cellName)
  )
)

Thanks,

Angelia 

Hi Angelia,

Yes, I had noticed that behaviour - sometimes it's useful, but I think it's bad practice use it deliberately.

Dave 

Hi ,

I use defstruct to define a variable

defstruct(var1 label msg)

If I Recall The Function Its Giving Warning

*WARNING* defstruct: Redefining Structure var1.

can u help me how to resolve.

Hi eDave,

boundp isn't working .

I will give u a simple example script

Input File (test.txt):

M2 width=0.34um length=0.5um
M3 width=0.34um length=0.5um

script:

procedure(mytest(fileName)
      prog( ()
          inFile = infile(fileName)
          defstruct(struct width length) ; giving warning here
          setq(tabel (makeTable 'layers 0))
          while(gets(line inFile)
              lineInList = parseString(line " \n")
              tabel[nth(0 lineInList)] = make_struct(?width nth(1 parseString(nth(1 lineInList) "=")) ?length nth(1 parseString(nth(2 lineInList) "=")))
               )
          )
     )
mytest("./test.txt")

= So where I need to check.

thanks,

Balu Soutani.