Re: LuaBind Function Default Values

I see this solution yesterday, i think i don't have much choise.

Others solution that i find is set many casts like this:

 .def("beginScene", (bool (IVideoDriver::*)())&IVideoDriver::beginScene)
 .def("beginScene", (bool (IVideoDriver::*)(bool,bool))&IVideoDriver::
beginScene)
 .def("beginScene", (bool (IVideoDriver::*)(bool,bool,bool,bool))&
IVideoDriver::beginScene)

This solution work well with this type of parameter, but if you need to send
a point the program crash, because lua send trash to the point.

Thanks Daniel, i'm waiting the 1.0 version.

2010/8/31 Daniel Wallin <[email protected]>

> On Mon, Aug 30, 2010 at 11:07 PM, Julio Cesar Cunha
> <[email protected]> wrote:
> > I think that is the solution, but in this way i will redo all.
> >
> > Strange that luabind don't suporte this feature yet, searching on google
> i
> > found some binds that do that, like toLua++ and Boost:Python.
> >
> > Anyway, Don't rasterbar don't say nothing about this feature? maybe in
> some
> > future update.
>
> The problem is that it isn't technically possible to detect and use
> the default values. They are not part of the function signature.
> Boost.Python supports default values by generating a set of overloads
> with different arities using a macro (from docs):
>
>  BOOST_PYTHON_FUNCTION_OVERLOADS(foo_overloads, foo, 1, 4)
>
> I'm planning to support default values in 1.0 by letting the user pass
> the values to def(), possibly using this syntax:
>
>  def("f", &f, _2 = "default value")
>
> But for now, the only solution is to define thin wrapper functions.
> This is pretty easy to do, but not ideal of course:
>
>  class X
>  {
>  public:
>      void f(int x = 0, int y = 0);
>  };
>
>  void f0(X& self)
>  {
>      self.f();
>  }
>
>  void f1(X& self, int x)
>  {
>      self.f(x);
>  }
>
>  void f2(X& self, int x, int y)
>  {
>      self.f(x, y);
>  }
>
>  ...
>
>  class_<X>("X")
>      .def("f", &f0)
>      .def("f", &f1)
>      .def("f", &f2)
>
> --
> Daniel Wallin
> BoostPro Computing
> http://www.boostpro.com
>
>
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