POV-Ray : Newsgroups : povray.beta-test : none keyword : none keyword Server Time
19 Jun 2021 06:07:30 EDT (-0400)
  none keyword  
From: ingo
Date: 5 Jan 2019 04:53:49
Message: <XnsA9CE6ED9DE6D1seed7@news.povray.org>
A feature request,

#declare Arr = array[10]{};
#declare Arr[3]= 5;
this results in a partially 'filled' array that can't be written to a 
file and then #included.
Something like #declare Arr = array[10]{,,,5,,,,..} won't work.

True, false & co. are values, so I can't put those as fillers in an array 
with values as they will be seen as legit values. They can't be used in 
an array with strings or objects (unless the array is of mixed type).

In an array with strings one could use an empty string "", in an array 
with values an odd one, -9999.99, same with vectors.
You can't use an empty object{} anywhere.

Could a 'none' keyword be introduced as a general placeholder for 
emptyness? 
object{none}
#declare Arr = array[10]{none,none,none,5,...}
#if(... none)
#while(... none)
#ifndef(Arr[I])#write(File,none)#end
#macro DoThing(A, optional B, optional C)
DoThing("Great thing", none, true)

ingo


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