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";}

For the specific case of std::tuple (or std::pair) objects, C++ offers the std::tie function which looks similar:

std::tuple<int, bool, double> my_obj {1, false, 2.0};// later on...int x;bool y;double z;std::tie(x, y, z) = my_obj;// or, if we don't want all the contents:std::tie(std::ignore, y, std::ignore) = my_obj;

I am not aware of an approach to the notation exactly as you present it.

Mostly there with std::map and std::tie:

#include <iostream>#include <tuple>#include <map>using namespace std;// an abstact object consisting of key-value pairsstruct thing{    std::map<std::string, std::string> kv;};int main(){    thing animal;    animal.kv["species"] = "dog";    animal.kv["sound"] = "woof";    auto species = std::tie(animal.kv["species"], animal.kv["sound"]);    std::cout << "The " << std::get<0>(species) << " says " << std::get<1>(species) << '\n';    return 0;}