Re: [luabind] Returning function from Lua

[Vladislav I. S. <v.s...@kg...>]

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________________________________

From: Vladislav I. Sobkovskiy=20
Sent: Wednesday, August 30, 2006 2:18 PM
To: 'lua...@li...'
Subject: RE: [luabind] Returning function from Lua

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Why you use tables? Luabind classes it is better think, take a look on
my test code:

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test3.lua

----------------------

class 'entity'

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      function entity:__init(name)

            self.name =3D name

            print('entity init')

      end

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      function entity:dump()

            print('\n --- entity dump ---\nname: ' .. self.name)

      end

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      function entity:foo()

            print('entity foo')

      end

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class 'test' (entity)

function test:__init(name) super(name)

      print('test init')

end

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function test:foo()

      entity.foo(self)

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      print("test foo")

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end

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function test:bar()

      print('test bar')

end

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C++ code

------------------------------

object *o1;

object *o2;

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// manual controlled 'live of objects'

void g()

{

      o1 =3D new object(
(globals(interpreter->state())["test"])("Entity1") );

      o2 =3D new object(
(globals(interpreter->state())["test"])("Entity2") );

      call_member<void> (*o1, "dump");

      call_member<void> (*o2, "dump");

      delete o1;

      delete o2;

}

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// automatically controlled 'live of objects'

void w()

{

      object o =3D globals(interpreter->state())["test"];

      object e =3D object(o("Entity3"));

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      call_member<void> (e, "dump");

}

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Try this one.

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-----Original Message-----
From: lua...@li...
[mailto:lua...@li...] On Behalf Of Steven
Lecompte
Sent: Wednesday, August 30, 2006 1:42 PM
To: lua...@li...
Subject: [luabind] Returning function from Lua

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First of all I use Luabind as an interface between Lua (5.1) and C++

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I want to return a table with lua functions that I can call in C++. When

I read the docs I had the idea to use a luabind object te catch the

result and then to execute this object. Now in practice this doesn't

really work. Here is my test code:

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Lua:

----

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Commands =3D {}

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Commands.Attack =3D function (FromProxy, TargetProxy) print ("Attack") =
end

Commands.Defend =3D function (FromProxy, TargetProxy) print ("Defend") =
end

Commands.Construct =3D function (FromProxy, TargetProxy) print=20

("Construct") end

Commands.Destroy =3D  function (FromProxy, TartgetProxy) print =
("Destroy")
end

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function SetPropertyCommand (Type)

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return Commands

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end

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C++: (Commands_ is the luabind::object)

----

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Commandgroup::Commandgroup (std::string Type, LuaStateObject&
Luahandling):

Luahandling_ (Luahandling)

{

  Commands_ =3D luabind::call_function <luabind::object>=20

(Luahandling_.Getstate(),

  "SetPropertyCommand", Type);

}

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void Commandgroup::ExecCommand (std::string CommandName, ProxyObj&=20

Target, ProxyObj& Source)

{

  //TEST

  luabind::call_function <void> (Commands_[1], boost::ref(Target),

  boost::ref(Source)); //error

  //TEST

}

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Error:

------

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Assertion failed: crep && "you are trying to use an unregistered type",

file ../

../../../Luabind/luabind/luabind/luabind/detail/policy.hpp, line 808

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This application has requested the Runtime to terminate it in an unusual

way.

Please contact the application's support team for more information.

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Press any key to continue.

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Now I wonder if Lua returns this as a 'pass by value' or as a reference

I have also tried to pass a luabind object as a reference argument (with

boost::ref) but this didn't work either.

Sorry if this is a noob question but I'm totally new with Lua and
Laubind.

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Thanks for your help

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