#include <array>
#include <cassert>
#include <cstddef>
#include <stdexcept>
struct Log {
    std::array<int, 8> values{};
    std::size_t size = 0;
    void add(int value) noexcept { values[size++] = value; }
};
struct Member {
    Log& log;
    int id;
    Member(Log& target, int value) : log(target), id(value) { log.add(id); }
    ~Member() noexcept { log.add(-id); }
};
struct Bundle {
    Member first;
    Member second;
    Bundle(Log& log, bool fail) : first(log, 1), second(log, 2) {
        if (fail) throw std::runtime_error("construction stopped");
    }
    ~Bundle() noexcept { first.log.add(9); }
};
int main() {
    Log failed;
    bool caught = false;
    try { Bundle b(failed, true); }
    catch (const std::runtime_error&) { caught = true; }
    assert(caught && failed.size == 4);
    assert((failed.values == std::array<int, 8>{{1, 2, -2, -1, 0, 0, 0, 0}}));
    Log success;
    { Bundle b(success, false); }
    assert(success.size == 5);
    assert((success.values == std::array<int, 8>{{1, 2, 9, -2, -1, 0, 0, 0}}));
}