How to get the attributes of a lua class without their names, using luabind

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Hello everyone,

I have a Lua class (defined using luabind's 'class' keyword) and I'd like
to get the value of the attributes defined in Lua, with C++.

In the code below, I've defined a class, created an instance "foo" and set
a custom attribute "bar" to that instance. Finally, I am calling a C++
function which has to print the attributes of the instance passed as a
parameter.

Here's the Lua code :

    class 'MyLuaClass'
    function MyLuaClass:__init() end

    foo = MyLuaClass()
    foo.bar = "baz";
    PrintAttributes(foo);

And now the C++ code of the PrintAttributes function, obj is a class
instance:

    void PrintAttributes(luabind::object &obj)
    {
        // Direct access works
        std::cout << obj["bar"] << std::endl; // Will print "baz" :-)

        // But what if I don't know the name of the variable(s)?
        for (luabind::iterator it(obj); it != luabind::iterator(); ++it)
        {
            // Doesn't work since obj is an userdata
        }
    }

I've also tried to use class_info but it only works with properties defined
in a C++ class. Is there a way to access those defined with Lua?

Regards,

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<div dir=3D"ltr">Hello everyone,<br><br>I have a Lua class (defined using l=
uabind&#39;s &#39;class&#39; keyword) and I&#39;d like to get the value of =
the attributes defined in Lua, with C++.<div><br></div><div>In the code bel=
ow, I&#39;ve defined a class, created an instance &quot;foo&quot; and set a=
 custom attribute &quot;bar&quot; to that instance. Finally, I am calling a=
 C++ function which has to print the attributes of the instance passed as a=
 parameter.</div>

<div><br></div><div>Here&#39;s the Lua code :</div><div><br></div><div><div=
>=A0 =A0 class &#39;MyLuaClass&#39;</div><div>=A0 =A0 function MyLuaClass:_=
_init() end</div><div>=A0 =A0=A0</div><div>=A0 =A0 foo =3D MyLuaClass()</di=
v><div>=A0 =A0 foo.bar =3D &quot;baz&quot;;</div>

<div>=A0 =A0 PrintAttributes(foo);</div></div><div><br></div><div><div>And =
now the C++ code of the PrintAttributes function, obj is a class instance:<=
/div><div><br></div><div>=A0 =A0 void PrintAttributes(luabind::object &amp;=
obj)</div>

<div>=A0 =A0 {</div><div>=A0 =A0 =A0 =A0 // Direct access works</div><div>=
=A0 =A0 =A0 =A0 std::cout &lt;&lt; obj[&quot;bar&quot;] &lt;&lt; std::endl;=
 // Will print &quot;baz&quot; :-)</div><div>=A0 =A0=A0</div><div>=A0 =A0 =
=A0 =A0 // But what if I don&#39;t know the name of the variable(s)?</div>

<div>=A0 =A0 =A0 =A0 for (luabind::iterator it(obj); it !=3D luabind::itera=
tor(); ++it)</div><div>=A0 =A0 =A0 =A0 {</div><div>=A0 =A0 =A0 =A0 =A0 =A0 =
// Doesn&#39;t work since obj is an userdata</div><div>=A0 =A0 =A0 =A0 }</d=
iv><div>=A0 =A0 }</div></div><div><br>

</div><div>I&#39;ve also tried to use class_info but it only works with pro=
perties defined in a C++ class. Is there a way to access those defined with=
 Lua?</div><div><br></div><div>Regards,</div><div><br></div></div>

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