so_5/blinking_led/main.cpp

/*
 * An example of using composite agent state, on_enter/on_exit handlers and
 * time_limit for states.
 */
#include <iostream>

#include <so_5/all.hpp>

class blinking_led final : public so_5::agent_t
{
  state_t off{ this }, blinking{ this },
    blink_on{ initial_substate_of{ blinking } },
    blink_off{ substate_of{ blinking } };

public :
  struct turn_on_off : public so_5::signal_t {};

  blinking_led( context_t ctx ) : so_5::agent_t{ ctx }
  {
    this >>= off;

    off.just_switch_to< turn_on_off >( blinking );

    blinking.just_switch_to< turn_on_off >( off );

    blink_on
      .on_enter( []{ std::cout << "ON" << std::endl; } )
      .on_exit( []{ std::cout << "off" << std::endl; } )
      .time_limit( std::chrono::milliseconds{1250}, blink_off );

    blink_off
      .time_limit( std::chrono::milliseconds{750}, blink_on );
  }
};

int main()
{
  try
  {
    so_5::launch( []( so_5::environment_t & env ) {
      so_5::mbox_t m;
      env.introduce_coop( [&]( so_5::coop_t & coop ) {
          auto led = coop.make_agent< blinking_led >();
          m = led->so_direct_mbox();
        } );

      auto pause = []( unsigned int v ) {
        std::this_thread::sleep_for( std::chrono::seconds{v} );
      };

      std::cout << "Turn blinking on for 10s" << std::endl;
      so_5::send< blinking_led::turn_on_off >( m );
      pause( 10 );

      std::cout << "Turn blinking off for 5s" << std::endl;
      so_5::send< blinking_led::turn_on_off >( m );
      pause( 5 );

      std::cout << "Turn blinking on for 5s" << std::endl;
      so_5::send< blinking_led::turn_on_off >( m );
      pause( 5 );

      std::cout << "Stopping..." << std::endl;
      env.stop();
    } );
  }
  catch( const std::exception & ex )
  {
    std::cerr << "Error: " << ex.what() << std::endl;
  }

  return 0;
}