Clear a vector
#include <iostream>
using std::cout;
using std::endl;
#include <vector> // vector class-template definition
#include <algorithm> // copy algorithm
#include <iterator> // ostream_iterator iterator
#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
