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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. class Item {
  5.     private:
  6.         int id;
  7.         std::string description;
  8.      public:
  9.         Item() : id(0), description("") {}
  10.         Item(int id, std::string description) : id(id), description(description) {}
  11.         int getId() const { return id; }
  12.         void setId(int value) { id = value; }
  13.         std::string getDescription() const { return description; }
  14.         void setDescription(std::string value) { description = value; }
  15. };
  16.  
  17. class Todo {
  18.     private:
  19.         std::vector<Item> todos;
  20.         static const int CLEAN=-1;    // Fix optimisation 
  21.         int fix_id_after=CLEAN;       // Fix optimisation 
  22.  
  23.     public:
  24.         Todo() = default;
  25.         Todo(std::vector<Item> todos) : todos(todos) {};
  26.         bool add(std::string description);
  27.         bool remove(int id);
  28.         bool edit(int id, std::string description);
  29.         void list();
  30.         void fix();
  31. };
  32.  
  33. bool Todo::add(std::string description) {
  34.     if (description.empty()) {
  35.         return false;
  36.     }
  37.  
  38.     todos.emplace_back(todos.size(), description);
  39.     return true;
  40. }
  41.  
  42. bool Todo::remove(int id) {
  43.     if (id < 0 || id >= static_cast<int>(todos.size())) {
  44.         return false;
  45.     }
  46.  
  47.     todos.erase(todos.begin() + id);
  48.     fix_id_after = id; 
  49.     return true;
  50. }
  51.  
  52. bool Todo::edit(int id, std::string description) {
  53.     if (id < 0 || id >= static_cast<int>(todos.size()) || description.empty()) {
  54.         return false;
  55.     }
  56.  
  57.     todos[id].setDescription(description);
  58.     return true;
  59. }
  60.  
  61. void Todo::list() {
  62. 	if (fix_id_after!=CLEAN)   // additional precaution - but referring to i in the loop would be simpler
  63.  		fix();                 //  "              "    
  64.     std::cout << "{Todo[";
  65.     for (size_t i = 0; i < todos.size(); ++i) {
  66.         const auto& item = todos[i];
  67.         std::cout << "{Item(id=" << item.getId() << ", desc=\"" << item.getDescription() << "\")}";
  68.         if (i != todos.size() - 1) std::cout << ", ";
  69.     }
  70.     std::cout << "]}" << std::endl;
  71. }
  72.  
  73. void Todo::fix() {
  74. 	if (fix_id_after!=CLEAN) { 	// small optimisation start 
  75.     	for (int i = fix_id_after; i < static_cast<int>(todos.size()); i++) {
  76.         	if (todos[i].getId() != i) {
  77.             	todos[i].setId(i);
  78.         	}
  79.     	}
  80. 	}
  81.     fix_id_after=CLEAN;    // CLEAN STATE 
  82. }
  83.  
  84. int main() {
  85.     Todo todos = Todo();
  86.     todos.add("Take out the trash.");
  87.     todos.add("Do the laundry.");
  88.     todos.add("Read a book.");
  89.     todos.add("Make dinner.");
  90.  
  91.     todos.remove(2);
  92.  
  93.     //todos.fix();
  94.  
  95.     todos.list();
  96.     return 0;
  97. }
Success #stdin #stdout 0.01s 5292KB
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Standard input is empty
stdout
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{Todo[{Item(id=0, desc="Take out the trash.")}, {Item(id=1, desc="Do the laundry.")}, {Item(id=2, desc="Make dinner.")}]}
https://ideone.com/uXcbHf
language:
C++14 (gcc 8.3)
created:
13 days ago
visibility:
secret

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