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18.2.1.h
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18.2.1.h
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#ifndef _CPLUSPLUS_PRIMER_H
#define _CPLUSPLUS_PRIMER_H
#include <string>
#include <stdexcept>
namespace cplusplus_primer{
using std::logic_error;
using std::string;
class Sales_data{
public:
Sales_data(const string & isbn);
Sales_data(const string & isbn, unsigned unit_sold);
bool operator==(const Sales_data & item) const;
Sales_data & operator+=(const Sales_data & item);
Sales_data operator+(const Sales_data & item) const;
private:
string isbn;
unsigned unit_sold;
};
inline bool Sales_data::operator==(const Sales_data & item) const{
return isbn == item.isbn;
}
class isbn_mismatch : public logic_error{
friend class Sales_data;
public:
isbn_mismatch(const string & msg, const string & lhs, const string & rhs):
logic_error(msg), lhs(lhs), rhs(rhs){}
isbn_mismatch(const char * msg, const string & lhs, const string & rhs):
isbn_mismatch(string(msg), lhs, rhs){}
private:
const string lhs;
const string rhs;
};
}
#endif