目标C ++中的“预期的不合格ID”错误

Question

XCode 10.1（默认编译器）无法编译以下代码

<?php

// load database connection script

include("database_connection.php");

/*
 * Tutorial: PHP MySQL Shopping cart
 *
 * Page: Application library
 * */

class ShopingCart
{



    protected $db;

    function __construct()
    {
        $this->db = DB();
    }

    /**
     * get products list
     *
     * @return array
     */
    public function getProducts()
    {
        $query = "SELECT *  FROM `entertainment`";
        if (!$result = mysqli_query($this->db, $query)) {
            exit(mysqli_error($this->db));
        }
        $data = [];
        if (mysqli_num_rows($result) > 0) {
            while ($row = mysqli_fetch_assoc($result)) {
                $data[] = $row;
            }
        }

        return $data;
    }

    /**
        * get given product details
        *
        * @param [integer] $id
        * @return array
        */
       public function getProductDetails($id)
       {
           $id = mysqli_real_escape_string($this->db, $id);
           $query = "SELECT *  FROM `entertainment` WHERE `id` = '$id'";
           if (!$result = mysqli_query($this->db, $query)) {
               exit(mysqli_error($this->db));
           }
           $data = [];
           if (mysqli_num_rows($result) > 0) {
               while ($row = mysqli_fetch_assoc($result)) {
                   $data['id'] = $row['id'];
                   $data['title'] = $row['title'];
                   $data['price'] = $row['offer_price_corporate_artist'];
                   $data['quantity'] = 1;
               }
           }

           return $data;
       }

       /**
        * Add new product into the cart
        *
        * @param [integer] $id
        * @return void
        */
       public function addToCart($id)
       {
           $product = $this->getProductDetails($id);

           $isFound = false;
           $i = 0;

           if (!isset($_SESSION['shopping_cart']) || count($_SESSION['shopping_cart']) < 1)
           {
               $_SESSION['shopping_cart'] = array(0 => $product);
           } else {

               foreach ($_SESSION['shopping_cart'] as $item) {
                   $i++;
                   foreach ($item as $key => $value) {
                       if ($key == "id" && $value == $id) {
                           array_splice($_SESSION['shopping_cart'], $i - 1, 1, array([
                               'id' => $item['id'],
                               'title' => $item['title'],
                               'price' => $item['offer_price_corporate_artist'],
                               'quantity' => $item['quantity'] + 1,
                           ]));
                           $isFound = true;
                       }
                   }

               }
               if ($isFound == false) {
                   array_push($_SESSION['shopping_cart'], $product);
               }
           }

       }

       /**
        * remove existing product from the cart
        *
        * @param [integer] $id
        * @return void
        */
       public function removeProductFromCart($id)
       {
           unset($_SESSION['shopping_cart'][$id - 1]);
       }


}

?>

错误代码在下面

Scanner sc = new Scanner(System.in);
String input = sc.next();

文件扩展名为 .mm （默认-Objective C ++）。当我将扩展名更改为 .m （默认-目标C）时，所有内容均可正确编译。对我来说，这是不合适的，因为我使用的是C ++ / Objective C混合源代码，并且我打算在文件中包含C ++头文件。

据我了解，这是一个编译器错误。它将设置器视为C ++ template <>。有什么解决方法吗？我可以告诉编译器将该行视为纯Objective C代码吗？