cev

An expandable data array used to add data to the beginning of the array.

``` use cev::Cev;

let mut cev = Cev::new(); cev.push(1); cev.push(2); cev.push(3);

asserteq!(cev, [3, 2, 1]); asserteq!(cev.pop(), Some(3)); asserteq!(cev.pop(), Some(2)); asserteq!(cev, [1]);

let mut cevapp = Cev::from([-2, -1, 0]); cev.append(&mut cevapp); assert_eq!(cev, [-2, -1, 0, 1]);

let mut cevlist = (0..6).collect::>(); asserteq!(cev_list, [0, 1, 2, 3, 4, 5]); ```

A Cev array containing the elements of type u8 a and b with capacity 4 can be visualized as below.

```text movptr rawptr len capacity Any mem +--------+--------+--------+--------+ |¹0x0124 |²0x0122 | 2 | 4 | +--------+--------+--------+--------+ | v Heap +--------+--------+--------+--------+ | uninit | uninit | b | a | +--------+--------+--------+--------+ | v Pointer +--------+--------+--------+--------+ | 0x0122 | 0x0123 | 0x0124 | 0x0125 | +--------+--------+--------+--------+ <--

     ¹ Beginning of array data initialization.
     ² To allocate and deallocate an array.

```