#ifndef VERTEX_H_
#define VERTEX_H_

#include <cstdint>
#include <compare>
#include <ostream>
#include <vector>

namespace graph {

template<typename T>
class Vertex {
public:
  Vertex() = default;
  Vertex(T v) : v(v) {}
  
  T v;
  std::uint16_t index = -1;
  std::uint16_t lowlink = -1;
  bool onStack = false;
  std::vector<Vertex<T>> edges;

  auto operator<=>(const Vertex&) const = default;

  template<typename T>
  friend inline std::ostream& operator<<(std::ostream& os, const Vertex<T>& v);
};

template<typename T>
inline std::ostream& operator<<(std::ostream& os, const Vertex<T>& vout) {
  return os << vout.v;
}

} // namespace graph

#endif