source: doc/theses/andrew_beach_MMath/code/fixup-empty.cpp@ b766c9b7

// Resume Across Fixup
#include <chrono>
#include <cstdlib>
#include <exception>
#include <iostream>
#include <iomanip>
#include <functional>

using namespace std;
using namespace chrono;

void nounwind_fixup(unsigned int frames, function<void (int &)> raised_rtn ) {
        if (frames) {
                nounwind_fixup(frames - 1, raised_rtn);
        } else {
                int fixup = 17;
                raised_rtn(fixup);
        }
}

int main(int argc, char * argv[]) {
        unsigned int times = 1;
        unsigned int total_frames = 1;
        if (1 < argc) {
                times = strtol(argv[1], nullptr, 10);
        }
        if (2 < argc) {
                total_frames = strtol(argv[2], nullptr, 10);
        }

        auto raised = [=] (int & fixup) -> void {
                                          fixup = total_frames + 42;            // use local scope => lexical link
                                  };
        time_point<steady_clock> start_time = steady_clock::now();
        for (unsigned int count = 0 ; count < times ; ++count) {
                nounwind_fixup(total_frames, raised);
        }
        time_point<steady_clock> end_time = steady_clock::now();
        nanoseconds duration = duration_cast<nanoseconds>(end_time - start_time);
        cout << "Run-Time (s): " << fixed << setprecision(1) << duration.count() / 1'000'000'000. << endl;
}