Conversion policies

Given a conversion policy which handles conversions
xxx -> C++, what should be passed to the converter
function so that it can deduce the type?

struct my_converter_policy
{
    template<class T>
    T convert(const param_type&, ...<T>);
                                 ^^^^^^ what goes here?
};

The simplest approach would be to just pass a
boost::type<T>, but this means partial ordering
won't work. Also, IIRC, trying to deduce T from
type<const T&> results in an ICE on VC6.5.

FWIW, in luabind, we handle this by decorating the
type:

   T           by_value<T>
   T&          by_reference<T>
   const T&    by_const_reference<T>
   T*          by_pointer<T>
   const T*    by_const_pointer<T>

---
Daniel Wallin



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