Re: Factories as script constructors.

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.
>
> TomN
>
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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/