Question regarding GetActors() method in the Cpp client

[noonchen-ni]

Hi,

I am trying to implement a logic to find the existing ego vehicle, and I have found the example code in the source:

carla/LibCarla/source/carla/trafficmanager/ALSM.cpp

Lines 116 to 128 in c733936

	for (auto iter = actor_list->begin(); iter != actor_list->end(); ++iter) {
	ActorPtr actor = *iter;
	ActorId actor_id = actor->GetId();
	// Identify any new hero vehicle
	if (actor->GetTypeId().front() == 'v') {
	if (hero_actors.size() == 0u || hero_actors.find(actor_id) == hero_actors.end()) {
	for (auto&& attribute: actor->GetAttributes()) {
	if (attribute.GetId() == "role_name" && attribute.GetValue() == "hero") {
	hero_actors.insert({actor_id, actor});
	}
	}
	}
	}

However, when I add this section in the Cpp client example, I can see an error in the Cpp IntelliSense as well as in build messages:

pointer or reference to incomplete type "carla::client::ActorList" is not allowedC/C++(833)

/main.cpp:208:26: error: invalid use of incomplete type ‘class carla::client::ActorList’
   for (auto iter = actors->begin(); iter != actors->end(); ++iter) {
                          ^~
In file included from /home/lenovo/dev/ccs_carla/libcarla-install/include/carla/client/detail/ActorState.h:10:0,
                 from /home/lenovo/dev/ccs_carla/libcarla-install/include/carla/client/Actor.h:11,
                 from /home/lenovo/dev/ccs_carla/libcarla-install/include/carla/client/detail/Simulator.h:13,
                 from /home/lenovo/dev/ccs_carla/libcarla-install/include/carla/client/Client.h:9,
                 from /home/lenovo/dev/ccs_carla/main.cpp:13:
/home/lenovo/dev/ccs_carla/libcarla-install/include/carla/client/World.h:39:9: note: forward declaration of ‘class carla::client::ActorList’
   class ActorList;
         ^~~~~~~~~
/home/lenovo/dev/ccs_carla/main.cpp:208:51: error: invalid use of incomplete type ‘class carla::client::ActorList’
   for (auto iter = actors->begin(); iter != actors->end(); ++iter) {
                                                   ^~
In file included from /home/lenovo/dev/ccs_carla/libcarla-install/include/carla/client/detail/ActorState.h:10:0,
                 from /home/lenovo/dev/ccs_carla/libcarla-install/include/carla/client/Actor.h:11,
                 from /home/lenovo/dev/ccs_carla/libcarla-install/include/carla/client/detail/Simulator.h:13,
                 from /home/lenovo/dev/ccs_carla/libcarla-install/include/carla/client/Client.h:9,
                 from /home/lenovo/dev/ccs_carla/main.cpp:13:
/home/lenovo/dev/ccs_carla/libcarla-install/include/carla/client/World.h:39:9: note: forward declaration of ‘class carla::client::ActorList’
   class ActorList;
         ^~~~~~~~~
...
make: *** [Makefile:111: all] Error 2

Here is the problematic code snippet:

  auto world = client.GetWorld();

  auto actors = world.GetActors();
  for (auto iter = actors->begin(); iter != actors->end(); ++iter) {
    cc::ActorPtr actor = *iter;
    // Identify hero vehicle
    if (actor->GetTypeId().front() == 'v') {
      for (auto&& attribute: actor->GetAttributes()) {
        if (attribute.GetId() == "role_name" && attribute.GetValue() == "hero") {
          std::cout << "Existing ego vehicle is found..." << std::endl;
          isExisted = TRUE;
          return boost::static_pointer_cast<cc::Vehicle>(actor);
        }
      }
    }
  }

Why does it fail in the cpp client code while work in the carla source? Much appreciated!

[noonchen-ni]

resolved, need to include #include <carla/client/ActorList.h>.