.dup on an array of BitArray not duplicating

[Chris Cain]

On Tuesday, 15 May 2012 at 20:26:12 UTC, ixid wrote:
> Sorry I made a typo in the second, it should be test2[0][0]. 
> I'm using std.bitmanip in D2.

Aha, I see! I'm somewhat surprised, normally I just use
Array!bool.

Well, you can look in the source to see some of how it works:
https://github.com/D-Programming-Language/phobos/blob/master/std/bitmanip.d#L475

So, when you call dup on the BitArray struct, it's duping the
payload pointer as well.

However, as I mentioned, duping a normal static array will not
"deep dup" everything.

You would have to do something like:

BitArray test[7];
foreach(ref i;test)
      i.length = 7;
BitArray[7] test2;
foreach(i, ref e; test)
      test2[i] = e.dup;
test2[0] = 1;

to get what you want done.