Add value to vector with push_back, use reverse iterators to loop through vector - C++ STL

C++ examples for STL:reverse_iterator

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Description

Add value to vector with push_back, use reverse iterators to loop through vector

Demo Code

#include <iostream> 
#include <vector>
using namespace std; 

template < typename T > void printVector( const vector< T > &integers2 ); 

int main() { /*from www.ja  v a2 s .  c o  m*/
   const int SIZE = 6; // define array size 
   int array[ SIZE ] = { 1, 2, 3, 4, 5, 6 }; // initialize array 
   vector< int > integers; // create vector of ints 

   cout << "The initial size of integers is: " << integers.size() 
       << "\nThe initial capacity of integers is: " << integers.capacity(); 

   // function push_back is in every sequence container 
   integers.push_back( 2 ); 
   integers.push_back( 3 ); 
   integers.push_back( 4 ); 

   cout << "\nThe size of integers is: " << integers.size() << "\nThe capacity of integers is: " << integers.capacity(); 
   cout << "\n\nOutput array using pointer notation: "; 

   // display array using pointer notation 
   for ( int *ptr = array; ptr != array + SIZE; ++ptr ) 
       cout << *ptr << ' '; 

   cout << "\nOutput vector using iterator notation: "; 
   printVector( integers ); 
   cout << "\nReversed contents of vector integers: "; 

   // two const reverse iterators 
   vector< int >::const_reverse_iterator reverseIterator; 
   vector< int >::const_reverse_iterator tempIterator = integers.rend(); 

   // display vector in reverse order using reverse_iterator 
   for ( reverseIterator = integers.rbegin(); reverseIterator!= tempIterator; ++reverseIterator ) 
       cout << *reverseIterator << ' '; 

   cout << endl; 
   
}

// function template for outputting vector elements 
template < typename T > void printVector( const vector< T > &integers2 ) 
{ 
   typename vector< T > ::const_iterator constIterator; // const_iterator 

    // display vector elements using const_iterator 
     for ( constIterator = integers2.begin(); constIterator != integers2.end(); ++constIterator ) 
         cout << *constIterator << ' '; 
}

Result


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