Mega Code Archive
Sort list with user-defined objects with greater
<![CDATA[
#include <algorithm>
#include <functional>
#include <iostream>
#include <iterator>
#include <list>
using namespace std;
class Salesperson
{
public:
Salesperson( const string& name = "", int sales = 0,int district = 0 );
bool operator>( const Salesperson& rhs ) const;
void print() const;
private:
int district_;
string name_;
int sales_;
};
inline
Salesperson::Salesperson( const string& name, int sales,
int district )
: district_( district ), name_( name ), sales_( sales )
{}
inline
bool Salesperson::operator>( const Salesperson& rhs ) const
{ return sales_ > rhs.sales_; }
inline
void Salesperson::print() const
{ cout << name_ << " from District " << district_
<< " has sales of $" << sales_ << endl;
}
int main( )
{
list<Salesperson> list1;
list1.push_back( Salesperson( "A", 37000, 1 ) );
list1.push_back( Salesperson( "B", 49000, 1 ) );
list1.push_back( Salesperson( "C", 48500, 1 ) );
// sort District 1 salespeople in descending order and display
list1.sort( greater<Salesperson>() );
for_each( list1.begin(), list1.end(), mem_fun_ref( &Salesperson::print ) );
list<Salesperson> list2;
list2.push_back( Salesperson( "A", 65000, 2 ) );
list2.push_back( Salesperson( "B", 33000, 2 ) );
list2.push_back( Salesperson( "C", 47000, 2 ) );
// sort District 2 salespeople in descending order and display
list2.sort( greater<Salesperson>() );
for_each( list2.begin(), list2.end(), mem_fun_ref( &Salesperson::print ) );
}
]]>