Demonstrating the STL vector front and erase operations.
#include <iostream>
#include <vector>
#include <string>
using namespace std;
int main()
{
string s("abcdefghij");
vector<char> vector1(s.begin(), s.end());
cout << "Popping characters off the front produces: ";
while (vector1.size() > 0) {
cout << vector1.front();
vector1.erase(vector1.begin());
}
cout << endl;
return 0;
}Popping characters off the front produces: abcdefghij
Get the first element in 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 );
cout << "\nFirst element of integers: " << integers.front();
return 0;
}Vector integers contains: 1 2 3 4 5 6 2 3 4
First element of integers: 1
