node.hpp

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#ifndef NODE_HPP_
#define NODE_HPP_

#include <iosfwd>
#include <string>

class node_impl;

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

  node& operator=(node const& n);

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

private:
  static node_impl* make_binary_operator(node, char, node);

  node_impl* pimpl_;
};

#endif

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