cpp24.cpp

C++参考书

// Coded by plusir -- Jan.11.2003.
// Standard C++ Bible -- (P636-22-24)

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

template<typename T>
class Compare
{
	public:
		bool operator () ( const T c1, const T c2 ) const
		{
			cout << "In Compare: " << c1 << " -- " << c2 << endl ;

			return c1 > c2 ;
		}
} ;

int main()
{
	map< int, char, Compare<int> > charMap ;

	cout << "Adding elements to the map:" << endl ;
	charMap[1] = 'A' ;
	charMap[3] = 'C' ;
	charMap[2] = 'B' ;
	charMap[4] = 'D' ;

	cout << "\nContents of map:" << endl ;
	for ( map< int, char, Compare<int> >::iterator iter = charMap.begin(); iter != charMap.end(); ++iter )
		cout << iter->first << "-->" << iter->second << endl ;

	return 0 ;
}