Re: adding fields to lua class from C++

Hi, 

 

Thanks, but unfortunately this didn't answer my question. I did not ask how
to do this from the design point of view but how to ensure that the code:

 

 if (m_Self[field_name])

 

won't fail. In other words how to force lua table to create entry
"field_name" from the C++ side? From the design point of view I've chosen
that it's C++ duty as I don't want to force script creator to first create
fields and then add them to dynamic fields list. It's simpler to have only
dynamic fields and force lua to put the field into table from C++ side.

 

Thanks



 

From: yaohua xiao [mailto:[email protected]] 
Sent: Friday, April 10, 2009 2:46 AM
To: [email protected]
Subject: Re: [luabind] adding fields to lua class from C++

 

 

I think it's a design problem. When you decided what c++ or lua's duty in
your project, the problem is clear.

In my opinion, i will use a std::map<string,string> to store the key-field
pairs 
and exports a get/set method to lua.

in your case:


function myClass:populateDynamicFields(

)

 addDynamicField('field1', int)

 addDynamicField('field2', string)

end

It seems that the fields will be different types, so I suggest to use the
string 
type to store field value, and translate it when you use it. 


 

2009/4/9 <[email protected]>

 

Message: 5
Date: Mon, 6 Apr 2009 20:47:37 +0200
From: "Domino" <[email protected]>
Subject: [luabind]  adding fields to lua class from C++
To: <[email protected]>
Message-ID: <000001c9b6e8$27f70da0$77e528e0$@fm>
Content-Type: text/plain; charset="us-ascii"

Hi all,



I'm working on pseudo-dynamic fields for the lua classes. What I want to
achieve is some sort of mapping of object fields available from C++. So my
script class will populate the fields map like:



function myClass:populateDynamicFields()

 addDynamicField('field1', int)

 addDynamicField('field2', string)

end



then from GUI I want to display this list of dynamic fields and be able to
set their values via get/setValueInt (eventually I would like to add fields
from GUI as well). These methods will basically look like below:



void myClassInterface::setValueInt(string name, int value)

{

 // let's say that I have luabind::object that is the script class
representation in luabind and it's called m_Self

 if (m_Self[name])

 {

   m_Self[name] = value;

 }

}



What I don't know is how to ensure that the m_Self[name] exists? Or how to
force its creation from C++ side? Like:



// .

if (!m_Self[name])

 // do something to create field



Is there some way to do this? Or maybe there is some more generic way to do
what I'm trying here?



Thanks a lot.

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