#include <boost/context/all.hpp>
#include <thread>

using Context = boost::context::execution_context<void>;

Context Main(Context context) {
  try {
    throw std::runtime_error("123");
  } catch (const std::exception& ex) {
    context = context();
  }
  return context();
}

int main() {
  Context context(&Main);
  context = context();
  std::thread([&] { context = context(); }).join();
  return 0;
}