c++ operator[]的例子

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


class X
{
public:
	int operator[](int key)
	{
	  switch(key)
	  {
	  case 1:
		  return 10;
		  break;
	  case 2:
		  return 20;
		  break;
	  default:
		  return 0;
		  break;
	  }
	}
};

int main()
{
     X a;
	 cout<<a[1]<<" "<<a[2]<<endl;
	 system("pause");
	 return 0;

}