Using set to Look up Items - C++ STL

C++ examples for STL:set

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Description

Using set to Look up Items

Demo Code

#include <iostream>
#include <string>
#include <set>

using namespace std;

class Employee/*from  w ww . j a  v a  2 s  .c om*/
{
public:
    string Nickname;
    string SocialSecurityNumber;

    Employee(string anickname, string asocial) :
        Nickname(anickname),
        SocialSecurityNumber(asocial) {}

    Employee() : Nickname(""), SocialSecurityNumber("") {}
};

bool operator < (const Employee& first,
const Employee& second)
{
    return first.SocialSecurityNumber <
        second.SocialSecurityNumber;
}

ostream& operator << (ostream &out, const Employee &emp)
{
    cout << "(" << emp.Nickname;
    cout << "," << emp.SocialSecurityNumber;
    cout << ")";
    return out;
}

int main()
{
    set<Employee> employees;

    Employee emp1("sparky", "123-22-1111");
    employees.insert(emp1);

    Employee emp2("buzz", "234-33-2222");
    employees.insert(emp2);

    Employee emp3("coollie", "123-22-3333");
    employees.insert(emp3);

    Employee emp4("sputz", "199-19-0000");
    employees.insert(emp4);

    // List the items
    set<Employee>::iterator iter = employees.begin();
    
    while (iter != employees.end())
    {
        cout << *iter << endl;
        iter++;
    }

    // Find an item
    cout << "Finding..." << endl;
    Employee findemp("", "123-22-8572");

    iter = employees.find(findemp);
    cout << *iter << endl;

    return 0;
}

Result


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