problem with filter.

[Andrea Fontana]

On Monday, 18 March 2013 at 09:15:50 UTC, Knud Soerensen wrote:
>
>> First writeln() actually edit the original array, so when you 
>> filter it
>> for the second array, fneg gives true for all clist[][][] 
>> elements.
>
> How would you get around this ?

You should work on a whole copy of clist array.
Or return copy of elements from map function instead of the 
element itself (<-- faster and lazy solution, i guess)

To get a whole copy you can try to do something like this:

T recursiveDup(T)(ref T array) if (isArray!T)
{
	T retVal = array.dup;
	foreach(ref e; retVal)
		static if (isArray!(typeof(e)))
			e = recursiveDup(e);

	return retVal;
}

gives you a copy of your array. It's a simple code, that works 
just for your specific case - not so efficient :)