How can I emulate destructuring in C++?

In C++17 this is called structured bindings, which allows for the following:

struct animal {
    std::string species;
    int weight;
    std::string sound;
};

int main()
{
  auto pluto = animal { "dog", 23, "woof" };

  auto [ species, weight, sound ] = pluto;

  std::cout << "species=" << species << " weight=" << weight << " sound=" << sound << "\n";
}