(C++) Append

Appends two containers using the algorithm std::copy and a std::back_inserter

#include <algorithm
#include <cassert>
#include <iostream>
#include <string>
#include <vector>

//From http://www.richelbilderbeek.nl
template <class Container>
void append(Container& toWhat, const Container& whatToAppend)
{
  std::copy(whatToAppend.begin(),whatToAppend.end(),std::back_inserter (toWhat));
}

//From http://www.richelbilderbeek.nl
int main()
{
  std::vector<int> v = {1, 4};
  const std::vector<int> to_append = {9, 16};
  append(v, to_append);
  const std::vector<int> expected = {1, 4, 9, 16};
  assert(v == expected);
}