std::unordered_multimap

Example

print: (comment: std::string_view, data) = {
    std::cout << comment;
    for data do (pair) {
        std::cout << " (pair.first)$((pair.second)$)";
    }
    std::cout << '\n';
}

main: () = {
    cont: std::unordered_multimap<int, char> = (
        std::make_pair(1, 'a'),
        std::make_pair(2, 'b'),
        std::make_pair(3, 'c'),
    );
 
    print("Start:", cont);
 
    // Extract node handle and change key
    nh:= cont.extract(1);
    nh.key() = 4;
 
    print("After extract and before insert:", cont);
 
    // Insert node handle back
    cont.insert(move nh);
 
    print("End:", cont);
}

Possible output

Start: 3(c) 2(b) 1(a)
After extract and before insert: 3(c) 2(b)
End: 4(a) 3(c) 2(b)