Re: 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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