cpp16.cpp

C++参考书

// Coded by plusir -- Jan.11.2003.
// Standard C++ Bible -- (P617-22-16)

#include <iostream>
#include <map>
using namespace std ;

ostream& operator << ( ostream &, map<int, char> & ) ;

int main()
{
	map<int, char> map1, map2 ;

	for ( int i = 1; i <= 5; ++i ) {
		map1[i] = 64 + i ;
		map2[i] = 69 + i ;
	}

	cout << "Contents of first map:" << endl ;
	cout << map1 ;
	cout << "Contents of second map:" << endl ;
	cout << map2 << endl ;

	cout << "map1 " ;
	cout << ( map1 == map2 ? "==" : ( map1 < map2 ? "<" : ">" ) ) ;
	cout << " map2" << endl ;

	return 0 ;
}

ostream& operator << ( ostream &output, map<int, char> &value )
{
	map<int, char>::iterator iter ;
	for ( iter = value.begin(); iter != value.end(); ++iter )
		cout << iter->first << "-->" << iter->second << endl ;

	return output ;
}