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