// stack.h
#ifndef STACK_H
#define STACK_H

#include <iostream>
#include <vector>

template<typename T>
class stack {
public:
  friend auto operator<<(std::ostream& os, const stack& s) -> std::ostream& {
    for (const auto& i : s.stack_)
      os << i << " ";
    return os;
  }
  auto push(T const& item) -> void;
  auto pop() -> void;
  auto top() -> T&;
  auto top() const -> const T&;
  auto empty() const -> bool;

private:
  std::vector<T> stack_;
};

#include "./class-template-start2.cpp"

#endif // STACK_H