11. STL Iterators

• An iterator is an object that provides access to objects stored in STL containers.

• Iterators are designed to behave like C++ pointers.

  
      #include <iostream>
      #include <vector>
      using namespace std;
      int main (int argc, char* argv[])
      {
          vector< int > vint( 3 ); // vector with 3 integer numbers
          vint[ 0 ] = 10;
          vint[ 1 ] = 20;
          vint[ 2 ] = 30;
  
          // Display elements of the vector:
          vector< int >::iterator it;
          for ( it = vint.begin(); it != vint.end(); ++it ) {
              // Like pointer, iterator is dereferenced to
              // access the value of the element pointed by it:
              cout << " " << *it;
          }
          return 0;
      }
      // Output: 10 20 30