ASIO-based main.cpp skeleton

main.cpp

#include <boost/asio/io_context.hpp>
#include <boost/asio/post.hpp>
#include <boost/asio/signal_set.hpp>
#include <boost/exception/diagnostic_information.hpp>

#include "logger.hpp"


namespace {


inline int run_io_loop(asio::io_context& ctx, asio::signal_set& signals) {
  signals.async_wait([&](auto const& ec, int signal_number) {
    if (!ec) {
      LOG_INFO("terminal signal [{}] received, terminating", signal_number);
      ctx.stop();
    }
  });

  try {
    while (ctx.poll() || ctx.run_one())
      ;
  } catch (...) {
    LOG_CRIT("exception: {}", boost::current_exception_diagnostic_information());
    logger->flush();
    return 1;
  }

  LOG_INFO("bye");
  logger->flush();
  return 0;
}

}  // namespace

int main(int argc, char** argv) {
  auto ctx = asio::io_context{1};
  auto signals = asio::signal_set{ctx, SIGINT /*, SIGTERM*/};

  post(ctx, [&] {
    // code to start the application goes here
  });

  int const rc = base::run_io_loop(rctx, signals);

  // perform cleanup, terminate and join background threads, etc.

  return rc;  
}