@abstract (synonyms: @virtual)
================================

.. rst:directive:: @abstract

   :Synonyms: :rst:dir:`@virtual`
   :Overview: The @abstract tag identifies members that must be implemented (or overridden) by objects that inherit the member.
   :Example:

      .. code-block:: js
         :caption: Parent class with abstract method, and child class that implements the method

         /**
          * Generic dairy product.
          * @constructor
          */
         function DairyProduct() {}

         /**
          * Check whether the dairy product is solid at room temperature.
          * @abstract
          * @return {boolean}
          */
         DairyProduct.prototype.isSolid = function() {
             throw new Error('must be implemented by subclass!');
         };

         /**
          * Cool, refreshing milk.
          * @constructor
          * @augments DairyProduct
          */
         function Milk() {}

         /**
          * Check whether milk is solid at room temperature.
          * @return {boolean} Always returns false.
          */
         Milk.prototype.isSolid = function() {
             return false;
         };

.. rst:directive:: @virtual

   :Synonyms: :rst:dir:`@abstract`