Re: Re move an object from the lua state!
Sympaval <[email protected]> Tue, 2 Aug 2011 05:21:26 -0700 (PDT)
| Newsgroups | gmane.comp.lang.lua.bind.user |
|---|---|
| Message-ID | <[email protected]> |
Hi!
I managed to reach my aim by using this method :
Enemy * e = luabind::call_function<Enemy *>(L, "CreateEnemy", "toto")
[luabind::adopt(luabind::result)];
it now works!
I will try now to create enemies anywhere in my code my this method, and see
if the programm is stable. I will let you know if things work perfecly.
Thanks for your help.
Sympaval wrote:
>
>
> Hi Andreas!
>
> I first try to insert my instances in a table, and nil them in lua to
> prevent lua_close from calling the destructor., but it didn't work.
>
> Now I try with the method you proposed.
> When I use .def("CreateEnemy", &CreateEnemy,
> luabind::adopt(luabind::result)), the programcompiles but the lua_close
> function still cause a segfault, i.e notthing changed.
>
> When I use .def("CreateEnemy", &CreateEnemy, luabind::adopt(_1)), T get
> this error at the compilation :
>
> (ngonta_e@mid-r02p04 916)g++ wrapping.cpp -o test -llua -lluabind >
> see.text
> In file included from /usr/include/luabind/detail/call.hpp:240,
> from
> /usr/include/boost/preprocessor/iteration/detail/iter/forward1.hpp:52,
> from /usr/include/luabind/detail/call.hpp:175,
> from /usr/include/luabind/make_function.hpp:10,
> from /usr/include/luabind/function.hpp:8,
> from /usr/include/luabind/class.hpp:94,
> from /usr/include/luabind.hpp:28,
> from wrapping.cpp:17:
> /usr/include/boost/preprocessor/iteration/detail/local.hpp: In function
> ‘int luabind::detail::invoke_normal(lua_State*, const
> luabind::detail::function_object&, luabind::detail::invoke_context&, const
> F&, Signature, const Policies&, mpl_::long_<1l>, mpl_::false_) [with F =
> Enemy* (*)(const std::string&), Signature = boost::mpl::vector2<Enemy*,
> const std::string&>, Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>]’:
> /usr/include/luabind/detail/call.hpp:89: instantiated from ‘int
> luabind::detail::invoke0(lua_State*, const
> luabind::detail::function_object&, luabind::detail::invoke_context&, const
> F&, Signature, const Policies&, IsVoid, mpl_::false_) [with F = Enemy*
> (*)(const std::string&), Signature = boost::mpl::vector2<Enemy*, const
> std::string&>, Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>, IsVoid = boost::is_void<Enemy*>]’
> /usr/include/luabind/detail/call.hpp:101: instantiated from ‘int
> luabind::detail::invoke(lua_State*, const
> luabind::detail::function_object&, luabind::detail::invoke_context&, const
> F&, Signature, const Policies&) [with F = Enemy* (*)(const std::string&),
> Signature = boost::mpl::vector2<Enemy*, const std::string&>, Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>]’
> /usr/include/luabind/make_function.hpp:63: instantiated from ‘static int
> luabind::detail::function_object_impl<F, Signature,
> Policies>::entry_point(lua_State*) [with F = Enemy* (*)(const
> std::string&), Signature = boost::mpl::vector2<Enemy*, const
> std::string&>, Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>]’
> /usr/include/luabind/make_function.hpp:36: instantiated from
> ‘luabind::detail::function_object_impl<F, Signature,
> Policies>::function_object_impl(F, const Policies&) [with F = Enemy*
> (*)(const std::string&), Signature = boost::mpl::vector2<Enemy*, const
> std::string&>, Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>]’
> /usr/include/luabind/make_function.hpp:111: instantiated from
> ‘luabind::adl::object luabind::make_function(lua_State*, F, Signature,
> Policies) [with F = Enemy* (*)(const std::string&), Signature =
> boost::mpl::vector2<Enemy*, const std::string&>, Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>]’
> /usr/include/luabind/class.hpp:311: instantiated from ‘void
> luabind::detail::memfun_registration<Class, F,
> Policies>::register_(lua_State*) const [with Class = Enemy, F = Enemy*
> (*)(const std::string&), Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>]’
> wrapping.cpp:110: instantiated from here
> /usr/include/boost/preprocessor/iteration/detail/local.hpp:34: error:
> ‘struct luabind::detail::adopt_policy<1>::only_accepts_nonconst_pointers’
> has no member named ‘consumed_args’
> In file included from
> /usr/include/boost/preprocessor/iteration/detail/iter/forward1.hpp:52,
> from /usr/include/luabind/detail/call.hpp:175,
> from /usr/include/luabind/make_function.hpp:10,
> from /usr/include/luabind/function.hpp:8,
> from /usr/include/luabind/class.hpp:94,
> from /usr/include/luabind.hpp:28,
> from wrapping.cpp:17:
> /usr/include/luabind/detail/call.hpp:257: error: ‘struct
> luabind::detail::adopt_policy<1>::only_accepts_nonconst_pointers’ has no
> member named ‘match’
> /usr/include/luabind/detail/call.hpp:89: instantiated from ‘int
> luabind::detail::invoke0(lua_State*, const
> luabind::detail::function_object&, luabind::detail::invoke_context&, const
> F&, Signature, const Policies&, IsVoid, mpl_::false_) [with F = Enemy*
> (*)(const std::string&), Signature = boost::mpl::vector2<Enemy*, const
> std::string&>, Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>, IsVoid = boost::is_void<Enemy*>]’
> /usr/include/luabind/detail/call.hpp:101: instantiated from ‘int
> luabind::detail::invoke(lua_State*, const
> luabind::detail::function_object&, luabind::detail::invoke_context&, const
> F&, Signature, const Policies&) [with F = Enemy* (*)(const std::string&),
> Signature = boost::mpl::vector2<Enemy*, const std::string&>, Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>]’
> /usr/include/luabind/make_function.hpp:63: instantiated from ‘static int
> luabind::detail::function_object_impl<F, Signature,
> Policies>::entry_point(lua_State*) [with F = Enemy* (*)(const
> std::string&), Signature = boost::mpl::vector2<Enemy*, const
> std::string&>, Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>]’
> /usr/include/luabind/make_function.hpp:36: instantiated from
> ‘luabind::detail::function_object_impl<F, Signature,
> Policies>::function_object_impl(F, const Policies&) [with F = Enemy*
> (*)(const std::string&), Signature = boost::mpl::vector2<Enemy*, const
> std::string&>, Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>]’
> /usr/include/luabind/make_function.hpp:111: instantiated from
> ‘luabind::adl::object luabind::make_function(lua_State*, F, Signature,
> Policies) [with F = Enemy* (*)(const std::string&), Signature =
> boost::mpl::vector2<Enemy*, const std::string&>, Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>]’
> /usr/include/luabind/class.hpp:311: instantiated from ‘void
> luabind::detail::memfun_registration<Class, F,
> Policies>::register_(lua_State*) const [with Class = Enemy, F = Enemy*
> (*)(const std::string&), Policies =
> luabind::detail::policy_cons<luabind::detail::adopt_policy<1>,
> luabind::detail::null_type>]’
> wrapping.cpp:110: instantiated from here
> /usr/include/luabind/detail/call.hpp:283: error: ‘struct
> luabind::detail::adopt_policy<1>::only_accepts_nonconst_pointers’ has no
> member named ‘apply’
> In file included from /usr/include/luabind/detail/call.hpp:305,
> from
> /usr/include/boost/preprocessor/iteration/detail/iter/forward1.hpp:52,
> from /usr/include/luabind/detail/call.hpp:175,
> from /usr/include/luabind/make_function.hpp:10,
> from /usr/include/luabind/function.hpp:8,
> from /usr/include/luabind/class.hpp:94,
> from /usr/include/luabind.hpp:28,
> from wrapping.cpp:17:
> /usr/include/boost/preprocessor/iteration/detail/local.hpp:34: error:
> ‘struct luabind::detail::adopt_policy<1>::only_accepts_nonconst_pointers’
> has no member named ‘converter_postcall’
>
> Please, reagarging my issue, what should i do in oder, to instanciate a
> new enemy wich will use the update methode in lua script, and delete the
> instance from c++ when it become useless for me, without having a crash in
> lua_close?
>
> If I should use luabind adopt_policy, what is the right wayin this case?
> Thank for helping me, I'm sure there should be a solution.
> CreateEnemy function is just like an enemies factory, not a member
> function.
>
> Thanks a lot, I'm really stressed.
>
>
>
> Andreas Grob-4 wrote:
>>
>> Hi,
>>
>> if you really want to transfer ownership from lua to c++, you can use
>> the adopt policy.
>> There is an example in the documentation:
>> http://www.rasterbar.com/products/luabind/docs.html#adopt
>>
>> Regards,
>> Andreas
>>
>> Am 02.08.2011 06:37, schrieb Sympaval:
>>> 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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>
>
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