evasive action snippet

evasive_action.cpp

void spaceship::take_evasive_action(list<threat> threats_by_proximity) {
  
  course escape_vector = nullptr;
  list<threat> weighted_threats = order_by_evasion_priority(
    threats_by_proximity, multiply_by_threat_severity);
  
  if (this->has_warp()) {
      bool warp_is_practical = true;
      double max_safe_warp = 1.0;
      // do a bunch of calculations about whether warp is
      // practical, based on current fuel, gravitational
      // fields, battle damage, etc. Also, figure out what
      // speed we can achieve.
      
      // ... 50 lines omitted ...
      
      if (warp_is_practical) {
        escape_vector = select_safest_course(max_safe_warp, 
          weighted_threats, bias::away);
      }
      
  } else {
    
    switch (this->conventional_propulsion_type) {
      case propulsion_type::impulse:
      // ... 5 lines omitted ...
      case propulsion_type::thrusters:
      // ... 4 lines omitted ...
      case propulsion_type::ion:
      // ... 12 lines omitted ...
      default:
        if (this->has_countermeasures())
          deploy_decoys();
        break;
    }
  }
  
  if (escape_vector) {
    engage(escape_vector);
  }
}