C++/Vector/vector clear

Clear a vector

<source lang="cpp">

1. include <iostream>

using std::cout; using std::endl;

1. include <vector> // vector class-template definition
2. include <algorithm> // copy algorithm
3. include <iterator> // ostream_iterator iterator
4. include <stdexcept> // out_of_range exception

int main() {

  int array[ 6 ] = { 1, 2, 3, 4, 5, 6 };
  std::vector< int > integers( array, array + 6 );
  std::ostream_iterator< int > output( cout, " " );
  integers.push_back( 2 );
  integers.push_back( 3 );
  integers.push_back( 4 );
  cout << "Vector integers contains: ";
  std::copy( integers.begin(), integers.end(), output );
  // insert elements from array
  integers.insert( integers.begin(), array, array + 6 );
  cout << "\n\nContents of vector integers before clear: ";
  std::copy( integers.begin(), integers.end(), output );
  // empty integers; clear calls erase to empty a collection
  integers.clear();
  cout << "\nAfter clear, vector integers "
     << ( integers.empty() ? "is" : "is not" ) << " empty" << endl;
  return 0;

} /* Vector integers contains: 1 2 3 4 5 6 2 3 4 Contents of vector integers before clear: 1 2 3 4 5 6 1 2 3 4 5 6 2 3 4 After clear, vector integers is empty

*/        
 </source>