C + + implementation of the headfirst design pattern-iterator (Iterator)

Iterator.h

1 #ifndef _iterator_h_2 #define_iterator_h_3 4#include"menu_item.h"5 6 classIterator {7  Public:8     Virtual BOOLHas_next () =0;9     VirtualMenuItem *next () =0; Ten }; One #endif

Menu_item.h

1 #ifndef _menu_item_h_2 #define_menu_item_h_3 4#include <string>5 6 classMenuItem {7 Private:8STD::stringname;9STD::stringdescription;Ten     BOOLVegetarian; One     DoublePrice ; A  Public: -MenuItem (ConstSTD::string&_name, -               ConstSTD::string_description, the               BOOL_vegetarian, -               Double_price): - name (_name), - description (_description), + Vegetarian (_vegetarian), - Price (_price) {} +      ASTD::stringGet_name () {returnname;} atSTD::stringGet_description () {returndescription;} -     DoubleGet_price () {returnPrice ;} -     BOOLIs_vegetarian () {returnVegetarian;} - }; - #endif

Pancake_house_menu.h

1 #ifndef _pancake_house_menu_h_2 #define_pancake_house_menu_h_3 4#include"menu_item.h"5#include"Iterator.h"6 7 classPancakehousemenu {8  Public:9     voidAdd_item (ConstSTD::string&name,Ten                   ConstSTD::string&description, One                   BOOLVegetarian, A                   DoublePrice ) { -         if(Item_num <Max_items) { -menu_items[item_num++] =NewMenuItem (name, description, vegetarian, price); the         } -     } -      -Pancakehousemenu (): Item_num (0), Iterator (* This) { +Add_item ("Name_1","descrption_1",true,4.5); -Add_item ("name_2","descrption_2",true,6.2); +Add_item ("Name_3","Descrption_3",false,3.5); A     } at      -~Pancakehousemenu () { -          for(inti =0; i < Item_num; i++ ) { -             DeleteMenu_items[i]; -         } -     } in   -Iterator *Get_iterator () { to         return&iterator; +     } -      the Private: *     class_iterator: PublicIterator { $     Private:Panax NotoginsengPancakehousemenu &menu; -         intPos; the      Public: +_iterator (Pancakehousemenu &_menu): POS (0), menu (_menu) {} A         BOOLHas_next () {returnPOS <Menu.item_num;} theMenuItem *Next () { +             returnmenu.menu_items[pos++]; -         } $ } iterator; $      -     Const Static intMax_items =6; -MenuItem *Menu_items[max_items]; the     intItem_num; - };Wuyi #endif

Main.cpp

1#include"pancake_house_menu.h"2#include <iostream>3 4 intMain () {5 pancakehousemenu menu;6Iterator *iterator =menu.get_iterator ();7      while(iterator->Has_next ()) {8MenuItem *menu_item = iterator->next ();9Std::cout << menu_item->get_name () <<" "Ten<< menu_item->get_description () <<" " One<< Menu_item->is_vegetarian () <<" " A<< Menu_item->get_price () <<Std::endl; -     } -}

C + + implementation of the headfirst design pattern-iterator (Iterator)