Store user-defined objects in a vector. - C++ STL

C++ examples for STL:vector

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Description

Store user-defined objects in a vector.

Demo Code

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;
class part {//from ww  w .j  a v  a  2  s .c o m
   string name;
   unsigned number;
   public:
   // Default constructor.
   part() { name  = ""; number = 0; }
   // Construct a complete part object.
   part(string n, unsigned num) {
      name = n;
      number = num;
   }
   // Accessor functions for part data.
   string get_name() { return name; }
   unsigned get_number() { return number; }
};
void show(const char *msg, vector<part> vect);
// Compare objects using part number.
bool operator<(part a, part b)
{
   return a.get_number() < b.get_number();
}
// Check for equality based on part number.
bool operator==(part a, part b)
{
   return a.get_number() == b.get_number();
}
int main()
{
   vector<part> partlist;
   // Initialize the parts list.
   partlist.push_back(part("A", 9));
   partlist.push_back(part("B", 8));
   partlist.push_back(part("C", 6));
   partlist.push_back(part("D", 1));
   show("Parts list unsorted:\n", partlist);
   cout << endl;
   // Use the sort() algorithm to sort the parts list.
   // This requires that operator<() be defined for part.
   sort(partlist.begin(), partlist.end());
   show("Parts list sorted by part number:\n", partlist);
   // Use the find() algorithm to find a part given its number.
   // This requires that operator==() be defined for part.
   cout << "Searching for part number 6912.\n";
   vector<part>::iterator itr;
   itr = find(partlist.begin(), partlist.end(), part("", 6912));
   cout << "Part found. Its name is " << itr->get_name() << ".\n";
   return 0;
}
// Display the contents of a vector<part>.
void show(const char *msg, vector<part> vect) {
   vector<part>::iterator itr;
   cout << msg;
   cout << "  Part#\t Name\n";
   for(itr=vect.begin(); itr != vect.end(); ++itr)
      cout << "  " << itr->get_number() << "\t "
   << itr->get_name() << endl;;
   cout << "\n";
}

Result


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