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==work with a multimap. key is appliance type, value is PC==


   
<source lang="cpp">    
#include <algorithm>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <string>
#include <utility>
#include <vector>
using namespace std;
class PC
{
   public:
   enum PC_type { Dell, HP, IBM, Compaq };
   PC( PC_type appliance = Dell, int model = 220,
      int serial = 0 );
   bool operator<( const PC& rhs ) const;
   PC_type appliance() const;
   int model() const;
   string name() const;
   void print() const;
   int serial() const;
   private:
   PC_type appliance_;
   int model_;
   int serial_;
};
inline
PC::PC( PC::PC_type appliance, int model,int serial )
   : appliance_( appliance ), model_( model ), serial_( serial )
{} // empty
inline
bool PC::operator<( const PC& rhs ) const
{ return appliance() < rhs.appliance() ||
   ( appliance() == rhs.appliance() && model() < rhs.model() );
}
inline
PC::PC_type PC::appliance() const
{ return appliance_; }
inline
int PC::model() const
{ return model_; }
string PC::name() const
{
   string what;
   switch( appliance() )
   {
      case Dell:    what = "Dell";               break;
      case HP:      what = "HP";                 break;
      case IBM:     what = "IBM";                break;
      case Compaq:  what = "Compaq";             break;
      default:      what = "Unknown appliance";  break;
   }
   return what;
}
inline
void PC::print() const
{
   char oldfill = cout.fill();
   cout << name() << " - Model "
        << model() << ", Serial number " 
        << serial() << endl;
}
inline
int PC::serial() const
{ return serial_; }
bool greater_model( const pair<PC::PC_type,PC> p,int min_model );
int main( )
{
   const PC::PC_type kind[] = { PC::IBM,PC::IBM, PC::Dell, PC::HP,PC::HP, PC::HP };
   const int num_appliances = 3;
   vector<PC> v;
   for( int i = 0; i < num_appliances; ++i )
      v.push_back( PC( kind[i], i, i ) );
   map<int,PC> sold;
   transform( kind, kind+num_appliances, v.begin(),inserter( sold, sold.end() ),make_pair<int,PC> );
   map<int,PC>::const_iterator sold_end = sold.end();
   map<int,PC>::const_iterator site;
   for( site = sold.begin(); site != sold_end; ++site )
      site->second.print();
   // work with a multimap. key is appliance type, value is PC
   typedef multimap<PC::PC_type,PC> PC_multimap_type;
   PC_multimap_type stock;
   const PC desired( PC::HP );
   cout << desired.name();
}
inline
bool greater_model( const pair<PC::PC_type,PC> p,int min_model )
{ return p.second.model() >= min_model; }
  
    
    
    
  </source>