On 7/15/18 7:45 AM, vino.B wrote:
On Saturday, 14 July 2018 at 17:20:52 UTC, Ali Çehreli wrote:
First, please show us code that demonstrates the issue.
On 07/14/2018 07:47 AM, vino.B wrote:
> The reason it never prints the text "Empty" is that the
out of the
> "r" is just an empty array.
>
> OUTPUT:
> []
> []
If that's the output of r, then r is not empty but has two elements
and those elements are likely arrays. If they are in fact arrays, them
being empty does not change r: it still has two elements.
If you want to treat the range as empty when all its elements are
empty, then perhaps your problem needs std.algorithm.joiner. The
following program demonstrates your issue with the first assert and
the fix with the second assert:
import std.algorithm;
import std.range;
void main() {
int[][] r = [ [], [] ];
assert(!r.empty);
auto joined_r = r.joiner;
assert(joined_r.empty);
}
joiner joins elements that are ranges themselves. For example,
joiner([ [1], [2] ]) is equal to [ 1, 2 ].
Ali
HI Ali,
Thank you very much, but unfortunately the above solution did not work
as the variable PFResult contains the output from the
workerLocalStorgage which is prited as PFResult.toRange , but was able
to find a solution as below
void ptThreadManager(alias coRoutine, T...)(Array!string Dirlst, T params)
{
alias scRType = typeof(coRoutine(string.init, T.init));
auto PFresult = taskPool.workerLocalStorage!scRType();
PFresult.get ~= coRoutine(FFs, params); }
int a = 0;
if (!(PFresult.toRange).empty) {
foreach(i; chain(PFresult.toRange)) { writeln(i[]); a = a +1;} }
I still don't know why you are using chain here as it equates to the
identity function in this instance:
https://github.com/dlang/phobos/blob/3d41721141f31059ca6e77dec2da390fad737955/std/range/package.d#L900
if(a == 0) { writeln("No files");
So I'm assuming from your assertion that this works, that the range is
not empty, but yields no elements when it's iterated? Seems like a bug
to me.
-Steve
