Struct Cart 

pub struct Cart {
    pub items: Vec<CartItem>,
}

A shopping cart.

Type-State Pattern for Cart Lifecycle

The cart can be extended with type-state markers to enforce valid transitions (e.g., empty → populated → checked out).

Fields

items: Vec<CartItem>

Items currently in the cart.

Implementations

impl Cart

pub const fn new() -> Self

Create an empty cart.

pub fn add_item(&mut self, item: CartItem)

Add an item to the cart.

pub fn total_cents(&self) -> u32

Calculate the total cart value in cents.

pub const fn is_empty(&self) -> bool

Check if the cart is empty.

Trait Implementations

impl Clone for Cart

fn clone(&self) -> Cart

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Cart

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Cart

fn default() -> Cart

Returns the “default value” for a type.

impl PartialEq for Cart

fn eq(&self, other: &Cart) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Cart

impl StructuralPartialEq for Cart