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  1. #include <cmath>
  2. #include <initializer_list>
  3.  
  4. #include <vector>
  5. #include <string>
  6. #include <iostream>
  7. #include <functional>
  8. #include <cstdlib>
  9. #include <map>
  10. using namespace std;
  11.  
  12. class CycledIndexer{
  13.     using Number = int;
  14. public:
  15.     CycledIndexer(Number max_val, Number val):
  16.         max_value(max_val), value(fixed(val)){}
  17. public:
  18.     Number max() const{ return max_value; }
  19.     void update_max(Number max){
  20.         max_value = max;
  21.         value = fixed(value);
  22.     }
  23.  
  24.     void add(int val){ value = fixed(value + val); }
  25.     void sub(int val){ add(-val); }
  26.  
  27.     void set(int val){ value = fixed(val); }
  28.  
  29.     CycledIndexer operator+(Number num){ return CycledIndexer(max_value, value + num); }
  30.     CycledIndexer operator-(Number num){ return CycledIndexer(max_value, value - num); }
  31.  
  32.     CycledIndexer &operator=(Number num){
  33.         set(num);
  34.         return *this;
  35.     }
  36.  
  37.     CycledIndexer &operator+=(Number num){
  38.         add(num);
  39.         return *this;
  40.     }
  41.     CycledIndexer &operator-=(Number num){
  42.         sub(num);
  43.         return *this;
  44.     }
  45.  
  46.     CycledIndexer &operator++(){
  47.         add(1);
  48.         return *this;
  49.     }
  50.     CycledIndexer &operator--(){
  51.         sub(1);
  52.         return *this;
  53.     }
  54.  
  55.     CycledIndexer operator++(int){
  56.         auto result = *this;
  57.         add(1);
  58.         return result;
  59.     }
  60.     CycledIndexer operator--(int){
  61.         auto result = *this;
  62.         sub(1);
  63.         return result;
  64.     }
  65.  
  66.     operator Number() const
  67.     { return value; }
  68. private:
  69.     Number fixed(Number val){
  70.         auto mod = val%max_value;
  71.         return mod<0 ? max_value + mod : mod;
  72.     }
  73. private:
  74.     Number max_value, value;
  75. };
  76.  
  77. struct MenuItem{
  78.     using Text = string;
  79.     using Action = function<void()>;
  80.  
  81.     Text text;
  82.     Action callback;
  83. };
  84.  
  85. template<typename MenuType>
  86. class MenuSelectionProxyTemplate{
  87. public:
  88.     using Menu = MenuType;
  89. public:
  90.     MenuSelectionProxyTemplate(Menu &menu): menu(menu){}
  91. public:
  92.     operator MenuItem&()
  93.     { return menu.items[menu.indexer]; }
  94.     operator const MenuItem&() const
  95.     { return menu.items[menu.indexer]; }
  96.  
  97.     void call()
  98.     { static_cast<MenuItem&>(*this).callback(); }
  99.  
  100.     auto &text()
  101.     { return static_cast<MenuItem&>(*this).text; }
  102.     const auto &text() const
  103.     { return static_cast<const MenuItem&>(*this).text; }
  104.  
  105.     void move_up()
  106.     { --menu.indexer; }
  107.     void move_down()
  108.     { ++menu.indexer; }
  109. private:
  110.     Menu &menu;
  111. };
  112.  
  113. class Menu{
  114. 	using Items = vector<MenuItem>;
  115.     using MenuSelectionProxy = MenuSelectionProxyTemplate<Menu>;
  116.     friend MenuSelectionProxy;
  117. public:
  118.     Menu(): indexer(0, 0){}
  119.     Menu(initializer_list<MenuItem> items_list):
  120.         items(items_list), indexer(items.size(), 0){}
  121. public:
  122.     void add_item(const MenuItem &item){ 
  123.         items.push_back(item); 
  124.         update_indexer();
  125.     }
  126.     void add_item(MenuItem &&item){ 
  127.         items.push_back(item); 
  128.         update_indexer();
  129.     }
  130.  
  131.     Items &all_items()
  132.     { return items; }
  133.     const Items &all_items() const
  134.     { return items; }
  135.  
  136.     MenuSelectionProxy selection()
  137.     { return MenuSelectionProxy(*this); }
  138.     const MenuSelectionProxy selection() const
  139.     { return MenuSelectionProxy(const_cast<Menu&>(*this)); }
  140. private:
  141.     void update_indexer(){
  142.         indexer.update_max(items.size());
  143.     }
  144. private:
  145.     Items items;
  146.     CycledIndexer indexer;
  147. };
  148.  
  149. int main(){
  150. 	Menu menu{
  151. 		{"Hello, World!", [&]{ cout << "I have just said hello to World." << endl; }},
  152. 		{"Hello, Fred!", [&]{ cout << "I have just said hello to Fred." << endl; }},
  153. 		{"Start game!", [&]{ cout << "I have just stared the game(?)." << endl; }},
  154. 		{"exit program!", [&]{ cout << "Ciao!"; exit(EXIT_SUCCESS); }}
  155. 	};
  156.  
  157. 	using Action = function<void()>;
  158. 	using ActionsMap = map<string, Action>;
  159. 	ActionsMap actions_map{
  160. 		{"up", [&]{ menu.selection().move_up(); }},
  161. 		{"down", [&]{menu.selection().move_down(); }},
  162. 		{"call", [&]{menu.selection().call(); }},
  163. 		{"wait", []{}}
  164.  
  165. 	};
  166.  
  167. 	string command;
  168. 	while(cin>>command){
  169. 		cout << "#--Woobly, woobly, the next step--#" << endl;
  170. 		cout << "#<<" << command << endl;
  171. 		if(actions_map.count(command) == false){
  172. 			cout << "STOP PASSING WRONG COMMANDS!" << endl;
  173. 			continue;
  174. 		}
  175. 		actions_map[command]();
  176.  
  177. 		for(const auto &item : menu.all_items()){
  178. 			cout << item.text;
  179. 			if(item.text == menu.selection().text())
  180. 				cout << " <-- (thats our selected buddy)";
  181. 			cout << endl;
  182. 		}
  183. 	}
  184. 	return 0;
  185. }
Success #stdin #stdout 0s 3472KB
comments (?)
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stdout
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#--Woobly, woobly, the next step--#
#<<wait
Hello, World! <-- (thats our selected buddy)
Hello, Fred!
Start game!
exit program!
#--Woobly, woobly, the next step--#
#<<call
I have just said hello to World.
Hello, World! <-- (thats our selected buddy)
Hello, Fred!
Start game!
exit program!
#--Woobly, woobly, the next step--#
#<<down
Hello, World!
Hello, Fred! <-- (thats our selected buddy)
Start game!
exit program!
#--Woobly, woobly, the next step--#
#<<call
I have just said hello to Fred.
Hello, World!
Hello, Fred! <-- (thats our selected buddy)
Start game!
exit program!
#--Woobly, woobly, the next step--#
#<<down
Hello, World!
Hello, Fred!
Start game! <-- (thats our selected buddy)
exit program!
#--Woobly, woobly, the next step--#
#<<call
I have just stared the game(?).
Hello, World!
Hello, Fred!
Start game! <-- (thats our selected buddy)
exit program!
#--Woobly, woobly, the next step--#
#<<down
Hello, World!
Hello, Fred!
Start game!
exit program! <-- (thats our selected buddy)
#--Woobly, woobly, the next step--#
#<<down
Hello, World! <-- (thats our selected buddy)
Hello, Fred!
Start game!
exit program!
#--Woobly, woobly, the next step--#
#<<down
Hello, World!
Hello, Fred! <-- (thats our selected buddy)
Start game!
exit program!
#--Woobly, woobly, the next step--#
#<<down
Hello, World!
Hello, Fred!
Start game! <-- (thats our selected buddy)
exit program!
#--Woobly, woobly, the next step--#
#<<up
Hello, World!
Hello, Fred! <-- (thats our selected buddy)
Start game!
exit program!
#--Woobly, woobly, the next step--#
#<<down
Hello, World!
Hello, Fred!
Start game! <-- (thats our selected buddy)
exit program!
#--Woobly, woobly, the next step--#
#<<down
Hello, World!
Hello, Fred!
Start game!
exit program! <-- (thats our selected buddy)
#--Woobly, woobly, the next step--#
#<<foobar
STOP PASSING WRONG COMMANDS!
#--Woobly, woobly, the next step--#
#<<call
Ciao!
https://ideone.com/2M0NuK
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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