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Copy pathvalue_holder.hpp
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166 lines (128 loc) · 4.89 KB
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#if !defined(BOOST_PP_IS_ITERATING)
// Copyright David Abrahams 2001.
// 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 VALUE_HOLDER_DWA20011215_HPP
# define VALUE_HOLDER_DWA20011215_HPP
# include <boost/python/object/value_holder_fwd.hpp>
# include <boost/python/instance_holder.hpp>
# include <boost/python/type_id.hpp>
# include <boost/python/wrapper.hpp>
# include <boost/python/object/inheritance_query.hpp>
# include <boost/python/object/forward.hpp>
# include <boost/python/detail/force_instantiate.hpp>
# include <boost/python/detail/preprocessor.hpp>
# include <boost/preprocessor/comma_if.hpp>
# include <boost/preprocessor/enum_params.hpp>
# include <boost/preprocessor/iterate.hpp>
# include <boost/preprocessor/repeat.hpp>
# include <boost/preprocessor/debug/line.hpp>
# include <boost/preprocessor/repetition/enum_params.hpp>
# include <boost/preprocessor/repetition/enum_binary_params.hpp>
# include <boost/utility/addressof.hpp>
namespace boost { namespace python { namespace objects {
#define BOOST_PYTHON_UNFORWARD_LOCAL(z, n, _) BOOST_PP_COMMA_IF(n) objects::do_unforward(a##n,0)
template <class Value>
struct value_holder : instance_holder
{
typedef Value held_type;
typedef Value value_type;
// Forward construction to the held object
# define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/value_holder.hpp>, 1))
# include BOOST_PP_ITERATE()
private: // required holder implementation
void* holds(type_info, bool null_ptr_only);
template <class T>
inline void* holds_wrapped(type_info dst_t, wrapper<T>*,T* p)
{
return python::type_id<T>() == dst_t ? p : 0;
}
inline void* holds_wrapped(type_info, ...)
{
return 0;
}
private: // data members
Value m_held;
};
template <class Value, class Held>
struct value_holder_back_reference : instance_holder
{
typedef Held held_type;
typedef Value value_type;
// Forward construction to the held object
# define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/value_holder.hpp>, 2))
# include BOOST_PP_ITERATE()
private: // required holder implementation
void* holds(type_info, bool null_ptr_only);
private: // data members
Held m_held;
};
# undef BOOST_PYTHON_UNFORWARD_LOCAL
template <class Value>
void* value_holder<Value>::holds(type_info dst_t, bool /*null_ptr_only*/)
{
if (void* wrapped = holds_wrapped(dst_t, boost::addressof(m_held), boost::addressof(m_held)))
return wrapped;
type_info src_t = python::type_id<Value>();
return src_t == dst_t ? boost::addressof(m_held)
: find_static_type(boost::addressof(m_held), src_t, dst_t);
}
template <class Value, class Held>
void* value_holder_back_reference<Value,Held>::holds(
type_info dst_t, bool /*null_ptr_only*/)
{
type_info src_t = python::type_id<Value>();
Value* x = &m_held;
if (dst_t == src_t)
return x;
else if (dst_t == python::type_id<Held>())
return &m_held;
else
return find_static_type(x, src_t, dst_t);
}
}}} // namespace boost::python::objects
# endif // VALUE_HOLDER_DWA20011215_HPP
// --------------- value_holder ---------------
// For gcc 4.4 compatability, we must include the
// BOOST_PP_ITERATION_DEPTH test inside an #else clause.
#else // BOOST_PP_IS_ITERATING
#if BOOST_PP_ITERATION_DEPTH() == 1 && BOOST_PP_ITERATION_FLAGS() == 1
# if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100) \
&& BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
# line BOOST_PP_LINE(__LINE__, value_holder.hpp(value_holder))
# endif
# define N BOOST_PP_ITERATION()
# if (N != 0)
template <BOOST_PP_ENUM_PARAMS_Z(1, N, class A)>
# endif
value_holder(
PyObject* self BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a))
: m_held(
BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil)
)
{
python::detail::initialize_wrapper(self, boost::addressof(this->m_held));
}
# undef N
// --------------- value_holder_back_reference ---------------
#elif BOOST_PP_ITERATION_DEPTH() == 1 && BOOST_PP_ITERATION_FLAGS() == 2
# if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100) \
&& BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
# line BOOST_PP_LINE(__LINE__, value_holder.hpp(value_holder_back_reference))
# endif
# define N BOOST_PP_ITERATION()
# if (N != 0)
template <BOOST_PP_ENUM_PARAMS_Z(1, N, class A)>
# endif
value_holder_back_reference(
PyObject* p BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a))
: m_held(
p BOOST_PP_COMMA_IF(N)
BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil)
)
{
}
# undef N
#endif // BOOST_PP_ITERATION_DEPTH()
#endif