Add separate methods to register hooks

This facilitates cloning the cart without registering additonal hooks unnecessarily.

includes/class-wc-cart-fees.php

@@ -63,6 +63,12 @@ final class WC_Cart_Fees {
 		}
 
 		$this->cart = $cart;
+	}
+
+	/**
+	 * Register methods for this object on the appropriate WordPress hooks.
+	 */
+	public function register_hooks() {
 		add_action( 'woocommerce_cart_emptied', array( $this, 'remove_all_fees' ) );
 		add_action( 'woocommerce_cart_reset', array( $this, 'remove_all_fees' ) );
 	}

includes/class-wc-cart-session.php

@@ -38,7 +38,12 @@ final class WC_Cart_Session {
 		}
 
 		$this->cart = $cart;
+	}
 
+	/**
+	 * Register methods for this object on the appropriate WordPress hooks.
+	 */
+	public function register_hooks() {
 		add_action( 'wp_loaded', array( $this, 'get_cart_from_session' ) );
 		add_action( 'woocommerce_cart_emptied', array( $this, 'destroy_cart_session' ) );
 		add_action( 'wp', array( $this, 'maybe_set_cart_cookies' ), 99 );

includes/class-wc-cart.php

@@ -109,6 +109,10 @@ class WC_Cart extends WC_Legacy_Cart {
 		$this->fees_api         = new WC_Cart_Fees( $this );
 		$this->tax_display_cart = get_option( 'woocommerce_tax_display_cart' );
 
+		// Register hooks for the objects.
+		$this->session->register_hooks();
+		$this->fees_api->register_hooks();
+
 		add_action( 'woocommerce_add_to_cart', array( $this, 'calculate_totals' ), 20, 0 );
 		add_action( 'woocommerce_applied_coupon', array( $this, 'calculate_totals' ), 20, 0 );
 		add_action( 'woocommerce_cart_item_removed', array( $this, 'calculate_totals' ), 20, 0 );