Re: Derived class with shared pointers and .def_readwrite

My bad.  I figured it out, the base class needed a virtual function, in
order to make in polymorphic.

Nigel

On Thu, 2010-01-28 at 03:12 +1300, Nigel Atkinson wrote:
> I think I've found a problem when having a derived classes and using
> smart pointers to hold them.
> 
> Having:
> 
> class A
> {
> };
> 
> class B : public A
> {
> public:
> 
>     int x;
> };
> 
> and binding with:
> 
>     module(L)
>     [
>         class_< A, shared_ptr<A> >( "A" )
>             .def( constructor<>() ),
> 
>         class_< B, A, shared_ptr<A> >( "B" )
>             .def( constructor<>() )
>             .def_readwrite( "x", &B::x )
>     ];
> 
> then running the Lua code:
> 
> b = B()
> b.x = 1234
> 
> results with the error:
> 
> No matching overload found, candidates:
> void <unknown>(B&,int const&)
> 
> The error disappears if you either:
> a) Don't use shared_ptr
> b) Don't tell luabind that B is derived from A, i.e. in the second class
> binding, remove the base class and change the shared pointer to B. 
> 
> Oh, and while I remember in the docs in section 8.7 at the end it says
> "base" where it should say "derived".  I've attached a patch.
> 
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