Removing Duplicates from Lists : list unique « List « C++

1. C++
2. List
3. list unique

Removing Duplicates from Lists

  
#include <algorithm>
#include <iostream>
#include <list>
#include <string>
#include <utility>

using namespace std;

void print_message( const pair<int,string>& message );

int main( )
{
   list< pair< int, string > > message;
   message.push_back( make_pair( 1, "A" ) );
   message.push_back( make_pair( 2, "B" ) );
   message.push_back( make_pair( 3, "C" ) );
   message.push_back( make_pair( 4, "M" ) );
   message.push_back( make_pair( 4, "M" ) );
   message.push_back( make_pair( 4, "M" ) );

   for_each( message.begin(), message.end(), print_message );
   message.unique();
   for_each( message.begin(), message.end(), print_message );

   message.sort();
   message.unique();
   for_each( message.begin(), message.end(), print_message );
}
void print_message( const pair<int,string>& message ){
   cout << message.first << " - " << message.second << endl;
}
  
    
  

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