Re move an object from the lua state!

Hi all!

I a  problem since two days now, while integreting lua to C++. I look at all
message corresponding to that issue here, but the answers are not clearly
explaned to help me, and here I would like to get the ritght way to achieve
what I would like to do.

In fact I have a c++ class wraped with luabind and exported to lua. I would
like to be able to create a new instance of my class in lua, get it and
delete it from c++. 
Actually i can create new instances of my object, and delete them without
problem, but when I close the lua state with lua_close(myLuaState), the
programme segfault. When i comment thje lua_close function all thinks are
ok. I realise that it's beacause when the lua_close is called, it tries to
call the destructor of all objects in the  lua state. 
Then I would like to delete the object from the c++ side when i want, and
remove it from the lua state. How can i achieve that?
This question has been already posted here in another way, but i didn't find
a answer which solve my problem.
I read the programming in lua documentation but I do not see how to proceed.
This is my code.

extern "C" {
#include <lua.h>
}

#include <iostream>
#include <lua.hpp>
#include <luabind.hpp>
#include <stdio.h>

class Enemy {
private:
  std::string name;

public:
  Enemy(const std::string& n)
    : name(n)
  {
    std::cout << "New enemy born with name : " << name << ".\n";
  }

  Enemy(Enemy const & other)
    : name(other.name)
  {
    std::cout << "Copy of enemy made : " << other.name << ".\n";
  }

  const std::string& getName() const
  {
    std::cout << "Enamy name has been asked and given.\n";
    return name;
  }

  void setName(const std::string& n) {
    name = n;
  }

  virtual int update()
  {
    std::cout << "Enemy::update() called.\n";
    return (43);
  }
};

class EnemyWrapper : public Enemy, public luabind::wrap_base {
public:
  EnemyWrapper(const std::string& n)
    : Enemy(n) {
  }

  virtual int update() {
    return (call<int>("update"));
  }
}

Enemy * CreateEnemy(std::string const & name)                                                                                                                                             
{
  return new Enemy(name);
}


int main() {                                                                                                                                                      
lua_State *  L = lua_open()                                                                                                                                            
  luabind::open(L);
  luaL_openlibs(L);
                                                                                                                                                
  luabind::module(L) [
                      luabind::class_<Enemy, EnemyWrapper>("Enemy")
                      .def(luabind::constructor<const std::string&>())
                      .property("name", &Enemy::getName, &Enemy::setName)
                      .def("update", &Enemy::update,
&EnemyWrapper::default_update)
                      .def("CreateEnemy", &CreateEnemy)
                      ];
                                                                                                                                               
  if (luaL_dofile(L, "wrapping.lua") != 0)
    std::cout << lua_tostring(L, -1) << std::endl;                                                                                                          
  int i = 1;
  for (; i <= 10; ++i)
    {
      std::cout << i << " " ;
      Enemy * e = luabind::call_function<Enemy *>(L, "CreateEnemy", "toto");                                                                   
      printf("%p :", e);
      std::cout << e->update() << std::endl;
      sleep(1);
      delete e;
    }
  lua_close(L);
}

Lua code:
print("Start the  script"); 
                                                                                                                                        
class 'Zombie' (Enemy)

function Zombie:__init(name)
   Enemy.__init(self, name);
end

function Zombie:update()
   print('Zombie:update() called.');
   self.talk();
   return (72);
end

function Zombie:talk()
   print("Yeah I'm a monster");
end

function CreateEnemy(name)             
return(Zombie(name));
end









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View this message in context: http://old.nabble.com/Remove-an-object-from-the-lua-state%21-tp32174811p32174811.html
Sent from the Lua C++ Bind mailing list archive at Nabble.com.


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