d_state.h

来自「数据结构c++语言描述stl版 威廉兄弟的好书,值得看,这是配书代码」· C头文件 代码 · 共 43 行

#ifndef STATECITY_CLASS
#define STATECITY_CLASS

#include <iostream>
#include <string>

using namespace std;

// object stores the state name and city in the state
class stateCity
{
	public:
		stateCity (const string& name = "", const string& city = ""):
			stateName(name), cityName(city)
		{}

		// output the state and city name in the format
		//    cityName, stateName
		friend ostream& operator<< (ostream& ostr, const stateCity& state)
		{
			ostr << state.cityName << ", " << state.stateName;

			return ostr;
		}

		// operators < and == must be defined to use with set object.
		// operators use only the stateName as the key
		friend bool operator< (const stateCity& a, const stateCity& b)
		{
			return a.stateName < b.stateName;
		}

		friend bool operator== (const stateCity& a, const stateCity& b)
		{
			return a.stateName == b.stateName;
		}

	private:
		string stateName, cityName;
};

#endif	// STATECITY_CLASS