Appending to multidimensional dynamic array

[Rikki Cattermole via Digitalmars-d-learn]

On 31/05/2015 12:41 a.m., kerdemdemir wrote:
> I want to append a 2D array to my 3D array. I expect it should be same
> as int[] arr; arr ~= 3;
>
> void readInput()
> {
>      char[][][] candidate;
>      char[] buff;
>      size_t counter = 0;
>      while (  stdin.readln(buff) )
>      {
>          char[][] line = buff.chomp().split();
>          writeln(line);
>
>          candidate ~= line;
>          writeln(candidate);
>          if (++counter > 1 ) break;
>      }
> }
>
> And I send the inputs below
>
> 201212?4 64
> 20121235 93
> I expect a output like
>
> [["201212?4", "64"], ["20121235", "93"]]
> But instead I see
>
> [["20121235", "93"], ["20121235", "93"]]
>
> In short :
> =~ replaces all the elements in the array with the last added. Where am
> I doing wrong? How can I meet my expectation?
>
>
> By the way I am posting the same question to stackoverflow at the same
> time. Does sending questions to stackoverflow as well as here not
> desirable for D community? If so I will just write here.

stackoverflow isn't normally looked at by those in the D community.

In your case its pretty simple. The buffer is being reused. So same 
memory being added multiple times to the candidate.
Just slap on a .dup when adding it.

It'll duplicate the contents in new memory so it won't be assigned on 
top of.