Re: Factories as script constructors.

Hi, In my scripts, I've had singleton classes since version 0.7. Maybe not what you are looking for, but here's how I did it: 1) For the bound class, simply remove the constructor bindings: luabind::constructor<>2) Instantiate the bound class in C++ and put it in globals: luabind::globals(L)["MyClass"] = &myClass;3) Then in Lua: MyClass:foo() Kristoffer
 Date: Fri, 24 Feb 2012 11:52:33 -0600
From: [email protected]
To: [email protected]
Subject: Re: [luabind] Factories as script constructors.

Seems like an useful addition and it sounds like you're on the right track (at least, that's how I'd do it :D) Please feel free to fork on github to keep track of your progress and share. Would be great to add a test at the same time for that functionality.

Ryan

On Fri, Feb 24, 2012 at 9:38 AM, Tom Nelson <[email protected]> wrote:

Here is what I have so far. I've included class.hpp and detail/factory_ctor.hpp. I'm still on luabind 9.1 by the way. (Also my plan is to get it working for 0 or 1 parameter before adding PP_ITERATION back in. Take a look and see if anything jumps out at you.




The code is based on detail/constructor.hpp since that seemed to be the closest to the functionality that I was trying to duplicate. factory_ctor should create a structure with the function call operator defined.  The trick, I think, is how to get luabind to correctly recognize the signature and build the call correctly.




I'm going to be looking at this more over the weekend.



Thanks again

Tom



On 02/23/2012 04:49 PM, Nigel Atkinson wrote:


This looks interesting, and in my opinion would make a useful addition

to the library.  Unfortunately I'm probably not better than you at

template meta programming, but I'm happy to take a look and see if

anything "jumps out".



I have a related yet different technique for singleton classes.  In

this case I want to make it explicit in the Lua code that it is a

singleton.  Fortunately vanilla Luabind can be used.



class_<  SomeManager>( "SomeManager" )

.scope

[

        .def( "getSingleton",&SomeManager::getSingleton )

]

.def( "func",&SomeManager::memberfunc )





mgr = SomeManager.getSingleton()

mgr:func()





Nigel







On 24/02/2012, at 9:57 AM, Thomas Nelson wrote:




I have a C++ class that I want to export to Lua.&nbsp;This class

requires a factory method to construct and I would like to hide this

little detail from the script side of things.



If my class looks like this:



class Foo

{

    public:

        static boost::shared_ptr<Foo>  factoryFoo( int N );

                

        void doSomething( );

    protected:

        Foo() ;

};



module(L)

[

    class_<Foo, boost::shared_ptr<Foo>  >("LuaFoo")

        .factory(&Foo::factoryFoo)

        .def("doSomething",&Foo::doSomething)

];



 From the script I would be able to do the following:



myF = LuaFoo( 5 ) -- Actually calls the static method

Foo::factoryFoo&nbsp;

myF:doSomething()



Has anyone else done something like this?&nbsp; I’ve gotten quite a

ways by cloning and mutating the constructor.hpp implementation and

adapting it to call a static member but I’m now getting lost in

template expansion hell.&nbsp;



I seem to be encountering two problems:

1)      Figuring out the Signature deduction templates and making my

static function “look” like a constructor.

2)      Determining the boost::shared_ptr<foo>  when I’m deep inside the

factory wrapper.



If anybody has some experience in these areas it would be great.



Tom



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------------------------------------------------------------------------------
Virtualization & Cloud Management Using Capacity Planning
Cloud computing makes use of virtualization - but cloud computing 
also focuses on allowing computing to be delivered as a service.
http://www.accelacomm.com/jaw/sfnl/114/51521223/
_______________________________________________
luabind-user mailing list
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https://lists.sourceforge.net/lists/listinfo/luabind-user

------------------------------------------------------------------------------
Virtualization & Cloud Management Using Capacity Planning
Cloud computing makes use of virtualization - but cloud computing 
also focuses on allowing computing to be delivered as a service.
http://www.accelacomm.com/jaw/sfnl/114/51521223/

_______________________________________________
luabind-user mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/luabind-user