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  1.     #include <iostream>
  2.     #include <string>
  3.     #include <vector>
  4.     #include <memory>
  5.     #include <algorithm>
  6.  
  7.     class Student {
  8.     private:
  9.         std::string name;
  10.  
  11.     public:
  12.         Student(const std::string& name_) : name(name_) {}
  13.         const std::string& getName() const { return name; }
  14.     };
  15.  
  16.     class Class {
  17.     private:
  18.         typedef std::vector<std::shared_ptr<Student>> SubscriptionList;
  19.         SubscriptionList students;
  20.         const unsigned int MaxSubscribers;
  21.  
  22.     public:
  23.         Class(unsigned int maxSubscribers) : MaxSubscribers(maxSubscribers) {}
  24.  
  25.         bool subscribe(std::shared_ptr<Student>& student) {
  26.             if(students.size() >= MaxSubscribers) {
  27.                 return false; // Class is full, can't subscribe
  28.             }
  29.  
  30.             // May be put additional checks here, to prevent multiple subscrptions
  31.             students.push_back(student);
  32.             return true; // Sucessfully subscribed the class
  33.         }
  34.  
  35.         void unsubscribe(std::shared_ptr<Student>& student) {
  36.             SubscriptionList::iterator it = students.begin();
  37.             for(;it != students.end();++it) {
  38.                 if(it->get() == student.get()) {
  39.                     break;
  40.                 }
  41.             }
  42.             students.erase(it);
  43.         }
  44.  
  45.         void showSubscribedStudents(std::ostream& os) {
  46.         	unsigned int i = 1;
  47.             for(SubscriptionList::iterator it = students.begin();
  48.                 it != students.end();
  49.                 ++it, ++i) {
  50.                 os << i << ". " << (*it)->getName() << std::endl;
  51.             }
  52.         }
  53.     };
  54.  
  55.     int main()
  56.     {
  57.         unsigned int amount;
  58.         std::cin >> amount;
  59.         std::cin.ignore(1,'\n');
  60.  
  61.         Class theClass(amount);
  62.  
  63.         for(unsigned int i = 0; i <= amount; ++i)
  64.         {
  65.             std::string name;
  66.             std::getline(std::cin,name);
  67.             std::shared_ptr<Student> student(new Student(name));
  68.             theClass.subscribe(student);
  69.         }
  70.  
  71.         theClass.showSubscribedStudents(std::cout);
  72.     }
  73.  
  74.  
Success #stdin #stdout 0s 3436KB
comments (?)
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5
John Doe
Jane Doe
Aldo Willis
Chuck Norris
Mia Miles
stdout
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1. John Doe
2. Jane Doe
3. Aldo Willis
4. Chuck Norris
5. Mia Miles
https://ideone.com/R6wYQY
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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