exercise14_15.h

#ifndef CP5_CH14_EX14_15_H_
#define CP5_CH14_EX14_15_H_

#include <iostream>
#include <string>

class Book
{
	friend std::istream& operator>>(std::istream&, Book&);
	friend std::ostream& operator<<(std::ostream&, const Book&);
	friend bool operator==(const Book&, const Book&);
	friend bool operator!=(const Book&, const Book&);
	friend bool operator<(const Book&, const Book&);
	friend bool operator>(const Book&, const Book&);
	friend Book operator+(const Book&, const Book&);

public:
	Book() = default;
	Book(unsigned no, std::string name, std::string author, std::string pubdate, unsigned number) :no_(no), name_(name), author_(author), pubdate_(pubdate), number_(number) {}
	Book(std::istream &in) { in >> *this; }

	Book& operator+=(const Book&);

private:
	unsigned no_;
	std::string name_;
	std::string author_;
	std::string pubdate_;
	unsigned number_;
};

std::istream& operator>>(std::istream&, Book&);
std::ostream& operator<<(std::ostream&, const Book&);
bool operator==(const Book&, const Book&);
bool operator!=(const Book&, const Book&);
bool operator<(const Book&, const Book&);
bool operator>(const Book&, const Book&);
Book operator+(const Book&, const Book&);

#endif // CP5_CH14_EX14_15_H_