=====insert=====
Syntax:

<code>
    #include <deque>
    iterator insert( iterator loc, const TYPE& val );
    void insert( iterator loc, size_type num, const TYPE& val );
    template<typename input_iterator>
    void insert( iterator loc, input_iterator start, input_iterator end );
</code>

The insert() function either:

  * inserts ''val'' before ''loc'', returning an iterator to the element inserted,
  * inserts ''num'' copies of ''val'' before ''loc'', or
  * inserts the elements from ''start'' to ''end'' before ''loc''.

For example:

<code>
   // Create a deque, load it with the first 10 characters of the alphabet
   deque<char> alphaDeque;
   for( int i=0; i < 10; i++ ) {
     static const char letters[] = "ABCDEFGHIJ";
     alphaDeque.push_back( letters[i] );
   }

   // Insert four C's into the deque
   deque<char>::iterator theIterator = alphaDeque.begin();
   alphaDeque.insert( theIterator, 4, 'C' );

   // Display the deque
   for( theIterator = alphaDeque.begin(); theIterator != alphaDeque.end(); ++theIterator ) {
     cout << *theIterator;
   }
</code>

This code would display:

<code terminal>
   CCCCABCDEFGHIJ
</code>

This next example uses several different methods to add data to a deque, and then uses the [[stl/algorithm/copy|copy algorithm]] to display the deque:

<code>
   deque<int> dq;
   dq.push_back(42);
   dq.push_front(1);
   dq.insert( dq.begin()+1, 2 );
   dq[2] = 16;
   copy( dq.begin(), dq.end(), ostream_iterator<int>(cout," ") );  // displays "1 2 16"
</code>

Related Topics: [[assign]], [[erase]], [[push_back]], [[push_front]]