//文件名:CHAPTER9-35.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
int main( )
{
set <int, less<int> > s1;
   set <int, less<int> >::value_compare vc1 = s1.value_comp( );
   bool result1 = vc1( 2, 3 );
   if( result1 == true )   
   {
      cout << "vc1( 2,3 ) returns value of true, "<< "where vc1 is the function object of s1."<< endl;
   }
   else   
   {
      cout << "vc1( 2,3 ) returns value of false, "<< "where vc1 is the function object of s1."<< endl;
   }
   set <int, greater<int> > s2;
   set<int, greater<int> >::value_compare vc2 = s2.value_comp( );
   bool result2 = vc2( 2, 3 );
   if( result2 == true )   
   {
      cout << "vc2( 2,3 ) returns value of true, "<< "where vc2 is the function object of s2."<< endl;
   }
   else   
   {
      cout << "vc2( 2,3 ) returns value of false, "<< "where vc2 is the function object of s2."<< endl;
   }
}