#pragma once

#include <string>
#include <iostream>

struct Object {
  Object() = delete;
  virtual ~Object() = default;
  virtual void write(std::ostream &os) const = 0;
};

struct Identifier : public Object {
  virtual void write(std::ostream &os) const final;
  std::string identifier;
};

struct StringLit : public Object {
  virtual void write(std::ostream &os) const final;
  std::string literal;
};

struct Number : public Object {
  virtual void write(std::ostream &os) const final;
  double number;
};

std::ostream &operator<<(std::ostream &os, const Object &obj);