Using a list to hold person objects - C++ STL

C++ examples for STL:list

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Description

Using a list to hold person objects

Demo Code

#include <iostream>
#include <list>
#include <algorithm>
#include <string>
using namespace std;
class person//ww w  . j a va  2  s  .com
{
   private:
   string lastName;
   string firstName;
   long phoneNumber;
   public:
   person() :             // no-arg constructor
   lastName("blank"), firstName("blank"), phoneNumber(0L)
   {  }
   // 3-arg constructor
   person(string lana, string fina, long pho) :
   lastName(lana), firstName(fina), phoneNumber(pho)
   {  }
   friend bool operator<(const person&, const person&);
   friend bool operator==(const person&, const person&);
   friend bool operator!=(const person&, const person&);
   friend bool operator>(const person&, const person&);
   void display() const   // display all data
   {
      cout << endl << lastName << ",\t" << firstName << "\t\tPhone: " << phoneNumber;
   }
   long get_phone() const // return phone number
   {
      return phoneNumber;
   }
};
// overloaded == for person class
bool operator==(const person& p1, const person& p2)
{
   return (p1.lastName == p2.lastName &&
   p1.firstName == p2.firstName ) ? true : false;
}
// overloaded < for person class
bool operator<(const person& p1, const person& p2)
{
   if(p1.lastName == p2.lastName)
      return (p1.firstName < p2.firstName) ? true : false;
   return (p1.lastName < p2.lastName) ? true : false;
}
// overloaded != for person class
bool operator!=(const person& p1, const person& p2)
{
   return !(p1==p2);
}
// overloaded > for person class
bool operator>(const person& p1, const person& p2)
{
   return !(p1<p2) && !(p1==p2);
}
int main()
{
   list<person> persList;    // list of persons
   // iterator to a list of persons
   list<person>::iterator iter1;
   // put persons in list
   persList.push_back( person("D", "W", 8) );
   persList.push_back( person("M", "S", 3) );
   persList.push_back( person("B", "P", 6) );
   persList.push_back( person("K", "B", 4) );
   persList.push_back( person("W", "J", 9) );
   persList.push_back( person("M", "A", 8) );
   persList.push_back( person("F", "R", 7) );
   persList.push_back( person("M", "S", 5) );
   cout << "\nNumber of entries = " << persList.size();
   iter1 = persList.begin();  // display contents of list
   while( iter1 != persList.end() )
      (*iter1++).display();
   // find person or persons with specified name (last and first)
   string searchLastName, searchFirstName;
   cout << "\n\nEnter last name of person to search for: ";
   cin >> searchLastName;
   cout << "Enter first name: ";
   cin >> searchFirstName;
   //make a person with that name
   person searchPerson(searchLastName, searchFirstName, 0L);
   //search for first match of names
   iter1 = find(persList.begin(), persList.end(), searchPerson);
   if( iter1 != persList.end() )  //find additional matches
   {
      cout << "Person(s) with that name is(are)";
      do
      {
         (*iter1).display();  //display match
         ++iter1;             //search again, one past match
         iter1 = find(iter1, persList.end(), searchPerson);
      } while( iter1 != persList.end() );
   }
   else
      cout << "There is no person with that name.";
   // find person or persons with specified phone number
   cout << "\n\nEnter phone number (format 1234567): ";
   long sNumber;              //get search number
   cin >> sNumber;
   //iterate through list
   bool found_one = false;
   for(iter1=persList.begin(); iter1 != persList.end(); ++iter1)
   {
         if( sNumber == (*iter1).get_phone() )  //compare numbers
         {
            if( !found_one )
            {
               cout << "Person(s) with that phone number is(are)";
               found_one = true;
            }
            (*iter1).display();  //display the match
         }
   }  //end for
   if( !found_one )
         cout << "There is no person with that phone number";
   cout << endl;
   return 0;
}

Result


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