#include <iostream>
#include <optional>
#include <string>

using namespace std;

optional<string> create(bool b)
{
  if(b) {
    return "Godzilla";
  } else {
    return {};
  }
}

auto create2(bool b)
{
  return b ? optional<string>{"Godzilla"} : nullopt;
}

int main()
{
  cout << "create(false) returned "
    << create(false).value_or("empty") << "\n";

  if(auto str = create2(true)) {
    cout << "create2(true) returned " << *str << " with size " << str->size() << "\n";
  }

  return 0;
}