Changing elements during foreach

[Dicebot]

On Monday, 21 October 2013 at 16:22:29 UTC, Krzysztof Ciebiera 
wrote:
> What I want to do is: I want to take a look at every single 
> solution and extend it if it is possible (eg. if solution 
> contains obbects a,b,c it can also contain d).

void main()
{
	import std.stdio;
	int[][] data = [ [ 0, 1, 2], [2, 3, 4] ];
	foreach(ref arr; data)
	{
		if (arr[0] == 2)
			arr ~= 5;
	}
	writeln(data);
}

?

(original arrays can be also allocated with extra capacity to 
avoid copy-allocation upon extending)