Chris@16: #if !defined(BOOST_PP_IS_ITERATING)
Chris@16: 
Chris@16: // Copyright David Abrahams 2001.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: # ifndef VALUE_HOLDER_DWA20011215_HPP
Chris@16: #  define VALUE_HOLDER_DWA20011215_HPP 
Chris@16: 
Chris@16: #  include <boost/python/object/value_holder_fwd.hpp>
Chris@16: 
Chris@16: #  include <boost/python/instance_holder.hpp>
Chris@16: #  include <boost/python/type_id.hpp>
Chris@16: #  include <boost/python/wrapper.hpp>
Chris@16: 
Chris@16: #  include <boost/python/object/inheritance_query.hpp>
Chris@16: #  include <boost/python/object/forward.hpp>
Chris@16: 
Chris@16: #  include <boost/python/detail/force_instantiate.hpp>
Chris@16: #  include <boost/python/detail/preprocessor.hpp>
Chris@16: 
Chris@16: #  include <boost/preprocessor/comma_if.hpp>
Chris@16: #  include <boost/preprocessor/enum_params.hpp>
Chris@16: #  include <boost/preprocessor/iterate.hpp>
Chris@16: #  include <boost/preprocessor/repeat.hpp>
Chris@16: #  include <boost/preprocessor/debug/line.hpp>
Chris@16: 
Chris@16: #  include <boost/preprocessor/repetition/enum_params.hpp>
Chris@16: #  include <boost/preprocessor/repetition/enum_binary_params.hpp>
Chris@16: 
Chris@16: #  include <boost/utility/addressof.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python { namespace objects { 
Chris@16: 
Chris@16: #  if BOOST_WORKAROUND(__GNUC__, == 2)
Chris@16: #   define BOOST_PYTHON_UNFORWARD_LOCAL(z, n, _) BOOST_PP_COMMA_IF(n) (typename unforward<A##n>::type)objects::do_unforward(a##n,0)
Chris@16: #  else
Chris@16: #   define BOOST_PYTHON_UNFORWARD_LOCAL(z, n, _) BOOST_PP_COMMA_IF(n) objects::do_unforward(a##n,0)
Chris@16: #  endif 
Chris@16: 
Chris@16: template <class Value>
Chris@16: struct value_holder : instance_holder
Chris@16: {
Chris@16:     typedef Value held_type;
Chris@16:     typedef Value value_type;
Chris@16: 
Chris@16:     // Forward construction to the held object
Chris@16: #  define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/value_holder.hpp>, 1))
Chris@16: #  include BOOST_PP_ITERATE()
Chris@16: 
Chris@16:  private: // required holder implementation
Chris@16:     void* holds(type_info, bool null_ptr_only);
Chris@16:     
Chris@16:     template <class T>
Chris@16:     inline void* holds_wrapped(type_info dst_t, wrapper<T>*,T* p)
Chris@16:     {
Chris@16:         return python::type_id<T>() == dst_t ? p : 0;
Chris@16:     }
Chris@16:     
Chris@16:     inline void* holds_wrapped(type_info, ...)
Chris@16:     {
Chris@16:         return 0;
Chris@16:     }
Chris@16:  private: // data members
Chris@16:     Value m_held;
Chris@16: };
Chris@16: 
Chris@16: template <class Value, class Held>
Chris@16: struct value_holder_back_reference : instance_holder
Chris@16: {
Chris@16:     typedef Held held_type;
Chris@16:     typedef Value value_type;
Chris@16:     
Chris@16:     // Forward construction to the held object
Chris@16: #  define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/value_holder.hpp>, 2))
Chris@16: #  include BOOST_PP_ITERATE()
Chris@16: 
Chris@16: private: // required holder implementation
Chris@16:     void* holds(type_info, bool null_ptr_only);
Chris@16: 
Chris@16:  private: // data members
Chris@16:     Held m_held;
Chris@16: };
Chris@16: 
Chris@16: #  undef BOOST_PYTHON_UNFORWARD_LOCAL
Chris@16: 
Chris@16: template <class Value>
Chris@16: void* value_holder<Value>::holds(type_info dst_t, bool /*null_ptr_only*/)
Chris@16: {
Chris@16:     if (void* wrapped = holds_wrapped(dst_t, boost::addressof(m_held), boost::addressof(m_held)))
Chris@16:         return wrapped;
Chris@16:     
Chris@16:     type_info src_t = python::type_id<Value>();
Chris@16:     return src_t == dst_t ? boost::addressof(m_held)
Chris@16:         : find_static_type(boost::addressof(m_held), src_t, dst_t);
Chris@16: }
Chris@16: 
Chris@16: template <class Value, class Held>
Chris@16: void* value_holder_back_reference<Value,Held>::holds(
Chris@16:     type_info dst_t, bool /*null_ptr_only*/)
Chris@16: {
Chris@16:     type_info src_t = python::type_id<Value>();
Chris@16:     Value* x = &m_held;
Chris@16:     
Chris@16:     if (dst_t == src_t)
Chris@16:         return x;
Chris@16:     else if (dst_t == python::type_id<Held>())
Chris@16:         return &m_held;
Chris@16:     else
Chris@16:         return find_static_type(x, src_t, dst_t);
Chris@16: }
Chris@16: 
Chris@16: }}} // namespace boost::python::objects
Chris@16: 
Chris@16: # endif // VALUE_HOLDER_DWA20011215_HPP
Chris@16: 
Chris@16: // --------------- value_holder ---------------
Chris@16: 
Chris@16: // For gcc 4.4 compatability, we must include the
Chris@16: // BOOST_PP_ITERATION_DEPTH test inside an #else clause.
Chris@16: #else // BOOST_PP_IS_ITERATING
Chris@16: #if BOOST_PP_ITERATION_DEPTH() == 1 && BOOST_PP_ITERATION_FLAGS() == 1
Chris@16: # if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100)                      \
Chris@16:         && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
Chris@16: #  line BOOST_PP_LINE(__LINE__, value_holder.hpp(value_holder))
Chris@16: # endif
Chris@16: 
Chris@16: # define N BOOST_PP_ITERATION()
Chris@16: 
Chris@16: # if (N != 0)
Chris@16:     template <BOOST_PP_ENUM_PARAMS_Z(1, N, class A)>
Chris@16: # endif
Chris@16:     value_holder(
Chris@16:       PyObject* self BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a))
Chris@16:         : m_held(
Chris@16:             BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil)
Chris@16:             )
Chris@16:     {
Chris@16:         python::detail::initialize_wrapper(self, boost::addressof(this->m_held));
Chris@16:     }
Chris@16: 
Chris@16: # undef N
Chris@16: 
Chris@16: // --------------- value_holder_back_reference ---------------
Chris@16: 
Chris@16: #elif BOOST_PP_ITERATION_DEPTH() == 1 && BOOST_PP_ITERATION_FLAGS() == 2
Chris@16: # if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100)                      \
Chris@16:         && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
Chris@16: #  line BOOST_PP_LINE(__LINE__, value_holder.hpp(value_holder_back_reference))
Chris@16: # endif
Chris@16: 
Chris@16: # define N BOOST_PP_ITERATION()
Chris@16: 
Chris@16: # if (N != 0)
Chris@16:     template <BOOST_PP_ENUM_PARAMS_Z(1, N, class A)>
Chris@16: # endif
Chris@16:     value_holder_back_reference(
Chris@16:         PyObject* p BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a))
Chris@16:         : m_held(
Chris@16:             p BOOST_PP_COMMA_IF(N)
Chris@16:             BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil)
Chris@16:             )
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16: # undef N
Chris@16: 
Chris@16: #endif // BOOST_PP_ITERATION_DEPTH()
Chris@16: #endif