Re: how to derive lua class from c++ class

Hi
Here <http://www.rasterbar.com/products/luabind/docs.html#deriving-in-lua>is
very clear described how to derive a class in Lua from C++ class.
For your example you should have something like that:

class testclass

{

public:

    testclass(const char* s): m_string(s)

    {std::cout << m_string << " @created." << std::endl;}

    *virtual* void print_string() { std::cout <<"testclass:" <<m_string <<
"\n"; }



private:

    std::string m_string;
};
struct testclass_wrapper : testclass, luabind:wrap_base
{
    testclass_wrapper(const char* s):
        testclass(s) {}

    virtual void print_string()
    {
        luabind::call_member<void>(this,"print_string");
    }

    static void default_print_string(testclass * ptr)
    {
        (ptr->testclass::print_string());
    }
};

...

module(L)
[
    class_<testclass, testclass_wrapper>("testclass")
    .def(constructor<const char*>())
    .def("print_string", &testclass::print_string, &
testclass_wrapper::default_print_string)
];

The Lua code:

class 'derivedclass' (testclass)


function derivedclass:__init(name)

   testclass.__init(self, name)

end


function derivedclass:print_string()

   testclass.print_string(self)

   print("This is derived class in Lua")

end



testderivedclass = derivedclass("hi")
testderivedclass:print_string()


2012/1/8 kunshou <[email protected]>

> ** **
>
> ** **
>
> *发件人:* kunshou [mailto:[email protected]]
> *发送时间:* 2012年1月2日 2:24
> *收件人:* [email protected]
> *主题:* how to derive lua class from c++ class****
>
> ** **
>
> Hi****
>
> I just stepped into luabind 0.9.1. I am trying to derive a class in lua
> from a c++ class.****
>
> My c++ class looks like****
>
> class testclass****
>
> {****
>
> public:****
>
>     testclass(const char* s): m_string(s) ****
>
>     {std::cout << m_string << " @created." << std::endl;}****
>
>     void print_string() { std::cout <<"testclass:" <<m_string << "\n"; }**
> **
>
> ** **
>
> private:****
>
>     std::string m_string;****
>
> };****
>
> ** **
>
> The lua code****
>
> ** **
>
> class 'derivedclass' (testclass)****
>
>   function derivedclass:__init(name)****
>
>     testclass:__init(name);****
>
>   end****
>
> ** **
>
> testderivedclass = derivedclass("hi")****
>
> testderivedclass:print_string()****
>
> ** **
>
> when I run this lua code in c++ using luaL_dofile, the program always
> crashes.****
>
> ** **
>
> Could anyone please tell what’s wrong with my code, or give a right
> example?****
>
> ** **
>
> Many thanks****
>
>
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>


-- 
Best regards,
Aliaksei Baiburyn

------------------------------------------------------------------------------
Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex
infrastructure or vast IT resources to deliver seamless, secure access to
virtual desktops. With this all-in-one solution, easily deploy virtual 
desktops for less than the cost of PCs and save 60% on VDI infrastructure 
costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox

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