python/include/boost/python/object/value_holder.hpp at python313 · boostorg/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 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

python/include/boost/python/object/value_holder.hpp at python313 · boostorg/python · GitHub

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