Parallelization issues

[Ali Çehreli]

On 03/08/2012 12:09 PM, ixid wrote:
 > Changing a[][2] to a[][] as suggested made it work. It's not clear to me
 > why it should matter that it's not dynamic in that axis or are arrays
 > simply static or dynamic globally?

The reason is that fixed-length arrays cannot be ranges themselves 
because popFront() cannot be implemented on them. Luckily though, we can 
very easily take a whole slice of a fixed-length array and that would be 
a range.

The following code has the same problem as yours:

// WARNING: Cannot be compiled
import std.stdio;
import std.parallelism;

void main()
{
     int[2] array = [ 1, 2 ];

     foreach (element; parallel(array)) {
         writeln(element);
     }
}

The fix is to pass a slice of array to parallel(). Now it works:

     foreach (element; parallel(array[])) {  // <-- note []
}

Now parallel() will consume the temporary slice that is passed to it.

Ali