.. _program_listing_file_src_data_iterator_facade.h:

Program Listing for File iterator_facade.h
==========================================

|exhale_lsh| :ref:`Return to documentation for file <file_src_data_iterator_facade.h>` (``src/data/iterator_facade.h``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #pragma once
   
   // simplistic replacement for boost::iterator_facade
   template <class Iterator, class Item>
   struct IteratorFacade {
     // to create DummyIterator inherit from public IteratorFacade<DummyIterator, ValueType>
     // and implement these three functions
     virtual bool equal(const Iterator& other) const = 0;
     virtual const Item& dereference() const = 0;
     virtual void increment() = 0;
   
     bool operator==(const Iterator& other) const {
       return equal(other);
     }
   
     bool operator!=(const Iterator& other) const {
       return !equal(other);
     }
   
     const Item& operator*() const {
       return dereference();
     }
   
     // prefix ++
     Iterator& operator++() {
       increment();
       return dynamic_cast<Iterator&>(*this);
     }
   
     // postfix ++
     Iterator operator++(int) {
       auto ret = dynamic_cast<Iterator&>(*this);
       increment();
       return ret;
     }
   
     const Item* operator->() const {
       return &dereference();
     }
   };