// Copyright David Abrahams 2003.

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

#ifndef DEF_VISITOR_DWA2003810_HPP

# define DEF_VISITOR_DWA2003810_HPP

# include <boost/python/detail/prefix.hpp>

# include <boost/detail/workaround.hpp>

namespace boost { namespace python { 

template <class DerivedVisitor> class def_visitor;

template <class T, class X1, class X2, class X3> class class_;

class def_visitor_access

{

# if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)                  \

    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))

    // Tasteless as this may seem, making all members public allows member templates

    // to work in the absence of member template friends.

 public:

# else      

    template <class Derived> friend class def_visitor;

# endif

    // unnamed visit, c.f. init<...>, container suites

    template <class V, class classT>

    static void visit(V const& v, classT& c)

    {

        v.derived_visitor().visit(c);

    }

    // named visit, c.f. object, pure_virtual

    template <class V, class classT, class OptionalArgs>

    static void visit(

        V const& v

      , classT& c

      , char const* name

      , OptionalArgs const& options

    ) 

    {

        v.derived_visitor().visit(c, name, options);

    }

};

template <class DerivedVisitor>

class def_visitor

{

    friend class def_visitor_access;

# if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)                  \

    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))

    // Tasteless as this may seem, making all members public allows member templates

    // to work in the absence of member template friends.

 public:

# else      

    template <class T, class X1, class X2, class X3> friend class class_;

# endif

    // unnamed visit, c.f. init<...>, container suites

    template <class classT>

    void visit(classT& c) const

    {

        def_visitor_access::visit(*this, c);

    }

    // named visit, c.f. object, pure_virtual

    template <class classT, class OptionalArgs>

    void visit(classT& c, char const* name, OptionalArgs const& options) const

    {

        def_visitor_access::visit(*this, c, name, options);

    }

 protected:

    DerivedVisitor const& derived_visitor() const

    {

        return static_cast<DerivedVisitor const&>(*this);

    }

};

}} // namespace boost::python

#endif // DEF_VISITOR_DWA2003810_HPP