C++ structured bindings

C++ structured bindings

Save as main.cpp and compile with a C++20 compiler, for example g++ -std=c++20 main.cpp -o example. The article states the minimum language version.

#include <map>
#include <string>
#include <iostream>
int main() {
    std::map<std::string, int> visits{{"Ada", 2}};
    for (auto& [name, count] : visits) {
        ++count;
        std::cout << name << ' ' << count << '\n';
    }
    std::cout << visits.at("Ada") << '\n';
}

1. Output: Ada 3, then 3. The reference binding changes the map value; the map key remains const.