number.hpp

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#ifndef NUMBER_HPP_
#define NUMBER_HPP_

#include <memory>
#include <ostream>
#include <string>

#include "rational.hpp"

class number_impl;

class number
{
public:
  number();
  number(int x);
  number(long x);
  number(long long x);
  number(double x);
  number(rational<long long> const& x);

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

  number(std::istream& stream);

  void save(std::ostream& stream)  const;

  bool equals(number b);

  bool less(number b);

  void coerce(number& rhs);

  std::string to_string() const;

  void print(std::ostream& stream);

  number operator+(number rhs);
  number operator-(number rhs);
  number operator*(number rhs);
  number operator/(number rhs);

private:
  number(std::shared_ptr<number_impl> ptr);

  std::shared_ptr<number_impl> pimpl_;
};

inline bool operator==(number a, number b)
{
  return a.equals(b);
}

inline bool operator!=(number a, number b)
{
  return not (a == b);
}

inline bool operator<(number a, number b)
{
  return a.less(b);
}

inline bool operator<=(number a, number b)
{
  return not(b < a);
}

inline bool operator>(number a, number b)
{
  return b < a;
}

inline bool operator>=(number a, number b)
{
  return not (a < b);
}

inline number operator-(number n)
{
  return number{0} - n;
}

inline std::ostream& operator<<(std::ostream& stream, number n)
{
  n.print(stream);
  return stream;
}

#endif