// MT2Q5 - collection of smart pointers

#include <memory>
#include <vector>
#include <iostream>
#include "../Utilities/Utilities.h"

class Verbal
{
public:
  Verbal();
  void say();
private:
  static size_t numberOfInstances_;
  size_t myNumber_;
};

size_t Verbal::numberOfInstances_ = 0;

Verbal::Verbal() : myNumber_(++numberOfInstances_) {}

void Verbal::say()
{
  std::cout << "\n  Verbal instance #" << myNumber_;
}

template<typename T>
class Collection
{
public:
  using iterator = typename std::vector<std::unique_ptr<T>>::iterator;
  iterator begin() { return collection_.begin(); }
  iterator end() { return collection_.end(); }
  void add(T* t);
private:
  std::vector<std::unique_ptr<T>> collection_;
};

template<typename T>
void Collection<T>::add(T* t)
{
  collection_.push_back(std::unique_ptr<T>(t));
}

template<typename CallObj>
void Operation(Collection<Verbal>& c, CallObj& co)
{
  for (auto& pElem : c)
  {
    co(*pElem);
  }
}
void main()
{
  title("MT2Q5 - Callable Object");
  Collection<Verbal> c;
  c.add(new Verbal());
  c.add(new Verbal());
  c.add(new Verbal());

  Operation(c, [](Verbal& v) { v.say(); });

  std::cout << "\n\n";
}