[C++-sig] Raw member and constructor functions

[David Abrahams]

"Studious Apprentice" <apprentice_99 at hotmail.com> writes:

> Hello !
>
> I would like to use raw member functions and a raw constructor. However I 
> can only manage to have raw functions to work.
>
> The following code works :
>
> #include <boost/python.hpp>
> #include <boost/python/raw_function.hpp>
> using namespace boost::python;
>
> tuple raw(tuple args, dict kw)
> {
> 	return make_tuple(args, kw);
> }
>
> BOOST_PYTHON_MODULE(PythonTest)
> {
> 	def("raw", raw_function(raw));
> }
>
> However this code does not compile with MSVC7.1 and results in "error C2064: 
> term does not evaluate to a function taking 2 arguments" :
>
> #include <boost/python.hpp>
> #include <boost/python/raw_function.hpp>
> using namespace boost::python;
>
> class X {
> public:
> 	object memberraw(tuple args, dict kw)
> 	{
> 		return object();
> 	}
> };
>
> BOOST_PYTHON_MODULE(PythonTest)
> {
> 	class_<X>("X")
> 		.def("memberraw", raw_function(&X::memberraw))
> 		;
> }

As http://www.boost.org/libs/python/doc/v2/raw_function.html says, 

   f(tuple(), dict())

must be well-formed where f is the argument to raw_function.  That's
clearly not the case here.  This might work:

tuple raw(tuple raw, dict kw)
{
    extract<X&>(raw[0])().memberraw(raw.slice(1), kw);
}

BOOST_PYTHON_MODULE(PythonTest)
{
	class_<X>("X")
		.def("memberraw", raw_function(raw))
		;
}


-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com