//文件名:CHAPTER9-34.cpp
#include <set>
#include <iostream>
#if _MSC_VER > 1020   // if VC++ version is > 4.2
   using namespace std;  // std c++ libs implemented in std
#endif
void main( )
{
   multiset <int, less<int> > ms1;
   multiset <int, less<int> >::key_compare kc1 = ms1.key_comp( ) ;
   bool result1 = kc1( 2, 3 ) ;
   if( result1 == true )   
   {
      cout << "kc1( 2,3 ) returns value of true, "
           << "where kc1 is the function object of s1."<< endl;
   }
   else   
   {
      cout << "kc1( 2,3 ) returns value of false "
           << "where kc1 is the function object of ms1."<< endl;
   }
   multiset <int, greater<int> > ms2;
   multiset <int, greater<int> >::key_compare kc2 = ms2.key_comp( ) ;
   bool result2 = kc2( 2, 3 ) ;
   if( result2 == true )   
   {
      cout << "kc2( 2,3 ) returns value of true, "
           << "where kc2 is the function object of ms2."<< endl;
   }
   else   
   {
      cout << "kc2( 2,3 ) returns value of false, "
           << "where kc2 is the function object of ms2." << endl;
   }
}