python/include/boost/python/object/pointer_holder.hpp at develop · elmopl/python · GitHub

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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 POINTER_HOLDER_DWA20011215_HPP

# define POINTER_HOLDER_DWA20011215_HPP

# include <boost/get_pointer.hpp>

# include <boost/type.hpp>

# include <boost/python/instance_holder.hpp>

# include <boost/python/object/inheritance_query.hpp>

# include <boost/python/object/forward.hpp>

# include <boost/python/pointee.hpp>

# include <boost/python/type_id.hpp>

# include <boost/python/detail/wrapper_base.hpp>

# include <boost/python/detail/force_instantiate.hpp>

# include <boost/python/detail/preprocessor.hpp>

# include <boost/python/detail/type_traits.hpp>

# include <boost/mpl/if.hpp>

# include <boost/mpl/apply.hpp>

# include <boost/preprocessor/comma_if.hpp>

# include <boost/preprocessor/iterate.hpp>

# include <boost/preprocessor/repeat.hpp>

# include <boost/preprocessor/debug/line.hpp>

# include <boost/preprocessor/enum_params.hpp>

# include <boost/preprocessor/repetition/enum_binary_params.hpp>

# include <boost/detail/workaround.hpp>

namespace boost { namespace python {

template <class T> class wrapper;

}}

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 Pointer, class Value>

struct pointer_holder : instance_holder

{

typedef Value value_type;

pointer_holder(Pointer);

// Forward construction to the held object

# define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/pointer_holder.hpp>, 1))

# include BOOST_PP_ITERATE()

private: // types

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

Pointer m_p;

};

template <class Pointer, class Value>

struct pointer_holder_back_reference : instance_holder

{

private:

typedef typename python::pointee<Pointer>::type held_type;

public:

typedef Value value_type;

// Not sure about this one -- can it work? The source object

// undoubtedly does not carry the correct back reference pointer.

pointer_holder_back_reference(Pointer);

// Forward construction to the held object

# define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/pointer_holder.hpp>, 2))

# include BOOST_PP_ITERATE()

private: // required holder implementation

void* holds(type_info, bool null_ptr_only);

private: // data members

Pointer m_p;

};

# undef BOOST_PYTHON_UNFORWARD_LOCAL

template <class Pointer, class Value>

inline pointer_holder<Pointer,Value>::pointer_holder(Pointer p)

#if defined(BOOST_NO_CXX11_SMART_PTR)

: m_p(p)

#else

: m_p(std::move(p))

#endif

{

}

template <class Pointer, class Value>

inline pointer_holder_back_reference<Pointer,Value>::pointer_holder_back_reference(Pointer p)

#if defined(BOOST_NO_CXX11_SMART_PTR)

: m_p(p)

#else

: m_p(std::move(p))

#endif

{

}

template <class Pointer, class Value>

void* pointer_holder<Pointer, Value>::holds(type_info dst_t, bool null_ptr_only)

{

typedef typename boost::python::detail::remove_const< Value >::type non_const_value;

if (dst_t == python::type_id<Pointer>()

&& !(null_ptr_only && get_pointer(this->m_p))

)

return &this->m_p;

Value* p0

# if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590))

= static_cast<Value*>( get_pointer(this->m_p) )

# else

= get_pointer(this->m_p)

# endif

;

non_const_value* p = const_cast<non_const_value*>( p0 );

if (p == 0)

return 0;

if (void* wrapped = holds_wrapped(dst_t, p, p))

return wrapped;

type_info src_t = python::type_id<non_const_value>();

return src_t == dst_t ? p : find_dynamic_type(p, src_t, dst_t);

}

template <class Pointer, class Value>

void* pointer_holder_back_reference<Pointer, Value>::holds(type_info dst_t, bool null_ptr_only)

{

if (dst_t == python::type_id<Pointer>()

&& !(null_ptr_only && get_pointer(this->m_p))

)

return &this->m_p;

if (!get_pointer(this->m_p))

return 0;

Value* p = get_pointer(m_p);

if (dst_t == python::type_id<held_type>())

return p;

type_info src_t = python::type_id<Value>();

return src_t == dst_t ? p : find_dynamic_type(p, src_t, dst_t);

}

}}} // namespace boost::python::objects

# endif // POINTER_HOLDER_DWA20011215_HPP

/* --------------- pointer_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__, pointer_holder.hpp)

# endif

# define N BOOST_PP_ITERATION()

# if (N != 0)

template< BOOST_PP_ENUM_PARAMS_Z(1, N, class A) >

# endif

pointer_holder(PyObject* self BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a))

: m_p(new Value(

BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil)

))

{

python::detail::initialize_wrapper(self, get_pointer(this->m_p));

}

# undef N

/* --------------- pointer_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__, pointer_holder.hpp(pointer_holder_back_reference))

# endif

# define N BOOST_PP_ITERATION()

# if (N != 0)

template < BOOST_PP_ENUM_PARAMS_Z(1, N, class A) >

# endif

pointer_holder_back_reference(

PyObject* p BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a))

: m_p(new held_type(

p BOOST_PP_COMMA_IF(N) BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil)

))

{}

# undef N

#endif // BOOST_PP_ITERATION_DEPTH()

#endif

python/include/boost/python/object/pointer_holder.hpp at develop · elmopl/python · GitHub

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