cloning array

[Steven Schveighoffer]

On 6/2/21 11:32 AM, Sean wrote:
> Is this normal behavior of dup? if so, how can I get the behavior i am 
> searching for? Thank you.
> 

Yes. `dup` is a shallow copy.

To get the behavior you want:

```d
auto deepdup(T)(T[] arr)
{
    import std.algorithm, std.array;
    static if(is(T == U[], U))
        return arr.map!(x => .deepdup(x)).array;
    else
        return arr.dup;
}

// use like arr.deepdup where you would normally put arr.dup
```

Note that this is going to be pretty inefficient allocation-wise, but 
will work with minimal code.

-Steve