node.hpp

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#ifndef NODE_HPP_
#define NODE_HPP_

#include <iosfwd>
#include <string>
#include <memory>

class node_impl;

class node {
public:
  node();
  node(double number);
  node(std::string identifier);
  node(node identifier, node number);
  node(char op, node operand);
  node(node left, char op, node right);

  ~node() = default;
  node(node const&) = default;
  node(node&&) = default;
  node& operator=(node const&) = default;
  node& operator=(node&&) = default;

  void print(std::ostream& stream, int indent = 0) const;
  double evaluate() const;
  std::string to_string() const;

private:
  static std::shared_ptr<node_impl> make_binary_operator(node, char, node);

  std::shared_ptr<node_impl> pimpl_;
};

#endif