Re: To And From C++

Hi Phil,

I got your example to work (at lest with GCC on Linux) by changing:

struct SomeBase {
	virtual void tickle() = 0 {}
};
to
struct SomeBase {
	virtual void tickle() { std::cout << "SomeBase::tickle()" <<  
std::endl; }
};
That is, I got rid of the " = 0 " bit on the method.  And it seemed to  
work, also with the bit you commented out back in.  GCC alerted me to  
the pure but not function when I tried compiling.

Also remember you could do:
void addLuaObj( SomeBase* obj)
{
      obj->ticklel();
}

as well.

Nigel

On 03/11/2011, at 6:31 AM, Phil Cooper-King wrote:

> Thanks Tony,
>
> there must be something else going on.
>
> Base* ptr = luabind::object_cast<Base*>(myobject);
>
> causes a crash,
> and also
>
> luabind::object method = globals(L)["MyClass"]["methodName"];
> int result = luabind::call_function<int>(method, instance,  
> additionalParams)
>
> causes a crash.
>
> this is the full source
> cpp http://pastie.org/2800173
> lua http://pastie.org/2800570
>
> On 2 November 2011 16:58, Tony Kostanjsek <[email protected]>  
> wrote:
>> hi Phil,
>>
>> pointer from luabind::object:
>>
>> Base* ptr = luabind::object_cast<Base*>(myobject);
>>
>> as for the method call: do you derive from a C++ class in Lua and  
>> do you want to call a method from the C++ interface, or do you want  
>> to call a method that has been added in Lua, but wasn't part of the  
>> original interface?
>> In any case, you can resort to a Lua style construction which  
>> should always work.
>>
>> luabind::object method = globals(L)["MyClass"]["methodName"];
>> int result = luabind::call_function<int>(method, instance,  
>> additionalParams)
>> which would be equivalent to Lua:
>> result = instance:methodName(additionalParams)
>> or alternatively
>> result = MyClass.methodName(instance, additionalParams)
>>
>> hth,
>> Tony
>>
>> On 02.11.2011, at 17:37, Phil Cooper-King wrote:
>>
>>> Hey Guys,
>>>
>>> I'm finding it quite easy to go from C++ to Lua in terms exposing
>>> functionality, but the other way around I'm not really understanding
>>> how to do it.
>>>
>>> I have C++ function
>>> void addObject(luabind::object)
>>> {
>>>     // Get Base ptr
>>>     // Call lua objects method.
>>> }
>>>
>>> How do I get the base pointer of this object (amusing its both  
>>> wrapped
>>> and inherited), and also how do I call its lua methods.
>>>
>>> I thought  the classes would be just tables, but they dont seem to
>>> return LUA_TTABLE.
>>>
>>> Thanks
>>> Phil.
>>>
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