{

# if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) \

|| BOOST_WORKAROUND(BOOST_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);

}

{

friend class def_visitor_access;

# if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) \

|| BOOST_WORKAROUND(BOOST_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);

}