While "easy" is rather subjective, I would say this: if you already know the basics of the standard library, then this is indeed quite easy. For the most part,

While "easy" is rather subjective, I would say this: if you already know the basics of the standard library, then this is indeed quite easy. For the most part, it's not even remotely modern. - it's a simple templated function; could even be reduced to one parameter if you use "typename Container::value_type" for Value - it's using find (standard library algorithm) - it's using begin and end (iterators common to all standard library containers) - it's using emplace_back (new to C++11 with rvalue refs, but everyone already knows push_back which it replaces) While emplace_back might be new to people using C++98, everything else is well over two decades old. It's extensively documented, and if you've ever done anything with the standard library, it's basic stuff. If any C++ programmer struggles to understand this, then they are essentially stating that they don't know the basics of the standard library or the language.