[HELP] - AsyncTask override & passing arguments

C++ coding using Panda3D
1

Hello everyone,
I have some trouble about passing arguments to AsyncTask.
I fount this topic and tried like this;

in Application.h;

class Application;

class MyTask : public AsyncTask {
public:
    MyTask(Application* _obj) : AsyncTask("My Task"), _self(_obj) {
    }
protected:
    virtual AsyncTask::DoneStatus do_task() {
        std::cout << "a is " << _self->a << std::endl;
        return AsyncTask::DS_done;
    }
private:
    Application* _self;
};

class Application : public CSingleton<Application>
{
public:
	Application();
	~Application();
    int a=5;
	void init();
	void create(std::string _title, int _w, int _h, bool _fullscreen);
	void loop();
	void exit();
};

in Application.cpp;

MyTask* _task = new MyTask(this);
AsyncTaskManager::get_global_ptr()->add(_task);

cant compile it;

err1
err1705Ă—409 20.7 KB

And if i add anything in MyTask class like “int a;” i can compile but game crashing;

class Application;

class MyTask : public AsyncTask {
public:
    int a;
    MyTask() : AsyncTask("My Task"){
    }
protected:
    virtual AsyncTask::DoneStatus do_task() {
        std::cout << "a is " << a << std::endl;
        return AsyncTask::DS_done;
    }
};

class Application : public CSingleton<Application>
{
public:
	Application();
	~Application();
	void init();
	void create(std::string _title, int _w, int _h, bool _fullscreen);
	void loop();
	void exit();
};

MyTask* _task = new MyTask();
_task->a = 7;
AsyncTaskManager::get_global_ptr()->add(_task);

err2
err2763Ă—190 14.9 KB

I prefer second method but like i said in public or private doesn’t matter when i add any variable game crashing. And i dont want to use GenericAsyncTask because in that type everything must be static.
Do you have any idea? Thanks…

2

You need to put ALLOC_DELETED_CHAIN(MyTask); in the body of the class definition.

You may also find this useful, to avoid the boilerplate of creating AsyncTask subclasses:

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