Check whether a range is empty

[vino.B]

On Friday, 13 July 2018 at 19:05:20 UTC, Steven Schveighoffer 
wrote:
> On 7/13/18 2:37 PM, vino.B wrote:
>> Hi All,
>> 
>>    How do i check whether a range is empty. eg. 
>> (!PFResutl.toRange).empty. I tired the below, but it is no 
>> printing Empty if the range is empty it just prints blank line.
>> 
>> if (!(!PFResutl.toRange).empty) { writeln("Empty"); }
>> 
>
> Without knowing what PFResutl is, let me simplify a bit:
>
> if( ! (expr).empty) { writeln("Empty"); }
>
> That exclamation point means "not". So you are first checking 
> if the range is NOT empty, and if so, printing "Empty". Is that 
> what you meant?
>
> -Steve

Hi Steve,

  Sorry there was a typo mistake, so the PFResult contain the 
results of "taskPool.workerLocalStorage" which i print using 
writeln(PFResult.toRange) so the requirement is that if the rage 
is empty it has to print "Empty" else it should print the result.


Eg:

  if (!(PFresult.toRange).empty) {
  foreach(i; chain(PFresult.toRange)) { writeln(i[]); }
  } else { writeln("Empty"); }

From,
Vino.B