Check whether a range is empty

[vino.B]

On Saturday, 14 July 2018 at 14:28:52 UTC, vino.B wrote:
> On Friday, 13 July 2018 at 19:45:03 UTC, Steven Schveighoffer 
> wrote:
>> On 7/13/18 3:29 PM, vino.B wrote:
>>>  [...]
>>
>>
>> Well, empty is how you detect whether any range is empty, and 
>> as far as ranges are concerned, your code is correctly 
>> checking for empty.
>>
>> A couple comments:
>>
>> 1. Why are you using chain with a single parameter? That just 
>> returns its parameter.
>> 2. You may want to try grabbing the range ONCE. i.e.:
>>
>> auto r = PFresult.toRange;
>> if(!r.empty)
>> {
>>    foreach(i; r) ...
>> }
>>
>> I'm not familiar with how taskPool works, so I don't know the 
>> real answer.
>>
>> -Steve
>
> Hi Steve,
>
>  i Tried your method no luck, it just prints blank lines.
>
> From,
> Vino.B

Hi Steve,

   The reason it never prints the text "Empty" is that the out of 
the "r" is just an empty array.

OUTPUT:
[]
[]

From,
Vino.B