datatools haxe library

Light library with a data structures stuff:

• read-only arrays;
• clone and compare support for Array;
• clone and compare support for Map.

`haxe // ArrayRO - read-only arrays import datatools.ArrayRO;

class A {} class B extends A {}

function main() {

var roA: ArrayRO<A> = [ new A() ]; // conversion from Array to ArrayRO with no explicit cast

var arrB = new ArrayRO<B>();
var arrA: ArrayRO<A> = arrB; // downcast conversion w/o explicit cast

}

// Deep array comparison import datatools.NullTools; using datatools.ArrayTools;

class EquableItem {

var a: String;
var b: Int;

public function equ(x:EquableItem)
{
    // don't test `x == null`, that doing automatically
    return a == x.a 
        && b == x.b;
}

}

function main() {

var arr1: Array<EquableItem>;
var arr2: Array<EquableItem>;

if (arr1.equ(arr2))
{
    ...
}

if (NullTools.equ(arr1, arr2)) // `arr1` and/or `arr2` can be null
{
    ...
}

} `

// Deep array cloning
import datatools.NullTools;
using datatools.ArrayTools;

class ClonableItem
{
    var a: String;
    var b: Int;

    public function new(a:String, b:Int)
    { 
        this.a = a; 
        this.b = b; 
    }

    public function clone(): ClonableItem
    {
        return new ClonableItem(a, b);
    }
}

function main()
{
    var arr1: Array<ClonableItem> = [ new ClonableItem("test", 5) ];
    var arr2 = arr1.clone();

    var arr3 = NullTools.clone(arr1); // if arr1 == null => clone result is null
 }
 ```