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 POINTER_HOLDER_DWA20011215_HPP
Chris@16: #  define POINTER_HOLDER_DWA20011215_HPP 
Chris@16: 
Chris@16: # include <boost/get_pointer.hpp>
Chris@16: #  include <boost/type.hpp>
Chris@16: 
Chris@16: #  include <boost/python/instance_holder.hpp>
Chris@16: #  include <boost/python/object/inheritance_query.hpp>
Chris@16: #  include <boost/python/object/forward.hpp>
Chris@16: 
Chris@16: #  include <boost/python/pointee.hpp>
Chris@16: #  include <boost/python/type_id.hpp>
Chris@16: 
Chris@16: #  include <boost/python/detail/wrapper_base.hpp>
Chris@16: #  include <boost/python/detail/force_instantiate.hpp>
Chris@16: #  include <boost/python/detail/preprocessor.hpp>
Chris@16: 
Chris@16: 
Chris@16: #  include <boost/mpl/if.hpp>
Chris@16: #  include <boost/mpl/apply.hpp>
Chris@16: 
Chris@16: #  include <boost/preprocessor/comma_if.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: #  include <boost/preprocessor/enum_params.hpp>
Chris@16: #  include <boost/preprocessor/repetition/enum_binary_params.hpp>
Chris@16: 
Chris@16: #  include <boost/detail/workaround.hpp>
Chris@16: 
Chris@16: #  include <boost/type_traits/remove_const.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python {
Chris@16: 
Chris@16: template <class T> class wrapper;
Chris@16: 
Chris@16: }}
Chris@16: 
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 Pointer, class Value>
Chris@16: struct pointer_holder : instance_holder
Chris@16: {
Chris@16:     typedef Value value_type;
Chris@16:     
Chris@16:     pointer_holder(Pointer);
Chris@16: 
Chris@16:     // Forward construction to the held object
Chris@16: 
Chris@16: #  define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/pointer_holder.hpp>, 1))
Chris@16: #  include BOOST_PP_ITERATE()
Chris@16: 
Chris@16:  private: // types
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: 
Chris@16:  private: // data members
Chris@16:     Pointer m_p;
Chris@16: };
Chris@16: 
Chris@16: template <class Pointer, class Value>
Chris@16: struct pointer_holder_back_reference : instance_holder
Chris@16: {
Chris@16:  private:
Chris@16:     typedef typename python::pointee<Pointer>::type held_type;
Chris@16:  public:
Chris@16:     typedef Value value_type;
Chris@16: 
Chris@16:     // Not sure about this one -- can it work? The source object
Chris@16:     // undoubtedly does not carry the correct back reference pointer.
Chris@16:     pointer_holder_back_reference(Pointer);
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/pointer_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:     Pointer m_p;
Chris@16: };
Chris@16: 
Chris@16: #  undef BOOST_PYTHON_UNFORWARD_LOCAL
Chris@16: 
Chris@16: template <class Pointer, class Value>
Chris@16: inline pointer_holder<Pointer,Value>::pointer_holder(Pointer p)
Chris@16:     : m_p(p)
Chris@16: {
Chris@16: }
Chris@16: 
Chris@16: template <class Pointer, class Value>
Chris@16: inline pointer_holder_back_reference<Pointer,Value>::pointer_holder_back_reference(Pointer p)
Chris@16:     : m_p(p)
Chris@16: {
Chris@16: }
Chris@16: 
Chris@16: template <class Pointer, class Value>
Chris@16: void* pointer_holder<Pointer, Value>::holds(type_info dst_t, bool null_ptr_only)
Chris@16: {
Chris@16:     typedef typename boost::remove_const< Value >::type non_const_value;
Chris@16: 
Chris@16:     if (dst_t == python::type_id<Pointer>()
Chris@16:         && !(null_ptr_only && get_pointer(this->m_p))
Chris@16:     )
Chris@16:         return &this->m_p;
Chris@16: 
Chris@16:     Value* p0
Chris@16: #  if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590))
Chris@16:         = static_cast<Value*>( get_pointer(this->m_p) )
Chris@16: #  else 
Chris@16:         = get_pointer(this->m_p)
Chris@16: #  endif
Chris@16:         ;
Chris@16:     non_const_value* p = const_cast<non_const_value*>( p0 );
Chris@16: 
Chris@16:     if (p == 0)
Chris@16:         return 0;
Chris@16:     
Chris@16:     if (void* wrapped = holds_wrapped(dst_t, p, p))
Chris@16:         return wrapped;
Chris@16:     
Chris@16:     type_info src_t = python::type_id<non_const_value>();
Chris@16:     return src_t == dst_t ? p : find_dynamic_type(p, src_t, dst_t);
Chris@16: }
Chris@16: 
Chris@16: template <class Pointer, class Value>
Chris@16: void* pointer_holder_back_reference<Pointer, Value>::holds(type_info dst_t, bool null_ptr_only)
Chris@16: {
Chris@16:     if (dst_t == python::type_id<Pointer>()
Chris@16:         && !(null_ptr_only && get_pointer(this->m_p))
Chris@16:     )
Chris@16:         return &this->m_p;
Chris@16: 
Chris@16:     if (!get_pointer(this->m_p))
Chris@16:         return 0;
Chris@16:     
Chris@16:     Value* p = get_pointer(m_p);
Chris@16:     
Chris@16:     if (dst_t == python::type_id<held_type>())
Chris@16:         return p;
Chris@16: 
Chris@16:     type_info src_t = python::type_id<Value>();
Chris@16:     return src_t == dst_t ? p : find_dynamic_type(p, src_t, dst_t);
Chris@16: }
Chris@16: 
Chris@16: }}} // namespace boost::python::objects
Chris@16: 
Chris@16: # endif // POINTER_HOLDER_DWA20011215_HPP
Chris@16: 
Chris@16: /* --------------- pointer_holder --------------- */
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__, pointer_holder.hpp)
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:     pointer_holder(PyObject* self BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a))
Chris@16:         : m_p(new Value(
Chris@16:                 BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil)
Chris@16:             ))
Chris@16:     {
Chris@16:         python::detail::initialize_wrapper(self, get_pointer(this->m_p));
Chris@16:     }
Chris@16: 
Chris@16: # undef N
Chris@16: 
Chris@16: /* --------------- pointer_holder_back_reference --------------- */
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__, pointer_holder.hpp(pointer_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:     pointer_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_p(new held_type(
Chris@16:                     p BOOST_PP_COMMA_IF(N) BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil)
Chris@16:             ))
Chris@16:     {}
Chris@16: 
Chris@16: # undef N
Chris@16: 
Chris@16: #endif // BOOST_PP_ITERATION_DEPTH()
Chris@16: #endif