python/include/boost/python/converter/arg_to_python.hpp at develop · rick68/python · GitHub

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// Copyright David Abrahams 2002.

// 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 ARG_TO_PYTHON_DWA200265_HPP

# define ARG_TO_PYTHON_DWA200265_HPP

# include <boost/python/ptr.hpp>

# include <boost/python/tag.hpp>

# include <boost/python/to_python_indirect.hpp>

# include <boost/python/converter/registered.hpp>

# include <boost/python/converter/registered_pointee.hpp>

# include <boost/python/converter/arg_to_python_base.hpp>

# include <boost/python/converter/shared_ptr_to_python.hpp>

// Bring in specializations

# include <boost/python/converter/builtin_converters.hpp>

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

# include <boost/python/base_type_traits.hpp>

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

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

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

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

# include <boost/type_traits/cv_traits.hpp>

# include <boost/type_traits/composite_traits.hpp>

# include <boost/type_traits/function_traits.hpp>

# include <boost/mpl/or.hpp>

namespace boost { namespace python { namespace converter {

template <class T> struct is_object_manager;

namespace detail

{

template <class T>

struct function_arg_to_python : handle<>

{

function_arg_to_python(T const& x);

};

template <class T>

struct reference_arg_to_python : handle<>

{

reference_arg_to_python(T& x);

private:

static PyObject* get_object(T& x);

};

template <class T>

struct shared_ptr_arg_to_python : handle<>

{

shared_ptr_arg_to_python(T const& x);

private:

static PyObject* get_object(T& x);

};

template <class T>

struct value_arg_to_python : arg_to_python_base

{

// Throw an exception if the conversion can't succeed

value_arg_to_python(T const&);

};

template <class Ptr>

struct pointer_deep_arg_to_python : arg_to_python_base

{

// Throw an exception if the conversion can't succeed

pointer_deep_arg_to_python(Ptr);

};

template <class Ptr>

struct pointer_shallow_arg_to_python : handle<>

{

// Throw an exception if the conversion can't succeed

pointer_shallow_arg_to_python(Ptr);

private:

static PyObject* get_object(Ptr p);

};

// Convert types that manage a Python object to_python

template <class T>

struct object_manager_arg_to_python

{

object_manager_arg_to_python(T const& x) : m_src(x) {}

PyObject* get() const

{

return python::upcast<PyObject>(get_managed_object(m_src, tag));

}

private:

T const& m_src;

};

template <class T>

struct select_arg_to_python

{

typedef typename unwrap_reference<T>::type unwrapped_referent;

typedef typename unwrap_pointer<T>::type unwrapped_ptr;

typedef typename mpl::if_<

// Special handling for char const[N]; interpret them as char

// const* for the sake of conversion

python::detail::is_string_literal<T const>

, arg_to_python<char const*>

, typename mpl::if_<

python::detail::value_is_shared_ptr<T>

, shared_ptr_arg_to_python<T>

, typename mpl::if_<

mpl::or_<

is_function<T>

, indirect_traits::is_pointer_to_function<T>

, is_member_function_pointer<T>

, function_arg_to_python<T>

, typename mpl::if_<

is_object_manager<T>

, object_manager_arg_to_python<T>

, typename mpl::if_<

is_pointer<T>

, pointer_deep_arg_to_python<T>

, typename mpl::if_<

is_pointer_wrapper<T>

, pointer_shallow_arg_to_python<unwrapped_ptr>

, typename mpl::if_<

is_reference_wrapper<T>

, reference_arg_to_python<unwrapped_referent>

, value_arg_to_python<T>

>::type

type;

};

}

template <class T>

struct arg_to_python

: detail::select_arg_to_python<T>::type

{

typedef typename detail::select_arg_to_python<T>::type base;

public: // member functions

// Throw an exception if the conversion can't succeed

arg_to_python(T const& x);

};

// implementations

namespace detail

{

// reject_raw_object_ptr -- cause a compile-time error if the user

// should pass a raw Python object pointer

using python::detail::yes_convertible;

using python::detail::no_convertible;

using python::detail::unspecialized;

template <class T> struct cannot_convert_raw_PyObject;

template <class T, class Convertibility>

struct reject_raw_object_helper

{

static void error(Convertibility)

{

cannot_convert_raw_PyObject<T*>::to_python_use_handle_instead();

}

static void error(...) {}

};

template <class T>

inline void reject_raw_object_ptr(T*)

{

reject_raw_object_helper<T,yes_convertible>::error(

python::detail::convertible<PyObject const volatile*>::check((T*)0));

typedef typename remove_cv<T>::type value_type;

reject_raw_object_helper<T,no_convertible>::error(

python::detail::convertible<unspecialized*>::check(

(base_type_traits<value_type>*)0

));

}

// ---------

template <class T>

inline function_arg_to_python<T>::function_arg_to_python(T const& x)

: handle<>(python::objects::make_function_handle(x))

{

}

template <class T>

inline value_arg_to_python<T>::value_arg_to_python(T const& x)

: arg_to_python_base(&x, registered<T>::converters)

{

}

template <class Ptr>

inline pointer_deep_arg_to_python<Ptr>::pointer_deep_arg_to_python(Ptr x)

: arg_to_python_base(x, registered_pointee<Ptr>::converters)

{

detail::reject_raw_object_ptr((Ptr)0);

}

template <class T>

inline PyObject* reference_arg_to_python<T>::get_object(T& x)

{

to_python_indirect<T&,python::detail::make_reference_holder> convert;

return convert(x);

}

template <class T>

inline reference_arg_to_python<T>::reference_arg_to_python(T& x)

: handle<>(reference_arg_to_python<T>::get_object(x))

{

}

template <class T>

inline shared_ptr_arg_to_python<T>::shared_ptr_arg_to_python(T const& x)

: handle<>(shared_ptr_to_python(x))

{

}

template <class Ptr>

inline pointer_shallow_arg_to_python<Ptr>::pointer_shallow_arg_to_python(Ptr x)

: handle<>(pointer_shallow_arg_to_python<Ptr>::get_object(x))

{

detail::reject_raw_object_ptr((Ptr)0);

}

template <class Ptr>

inline PyObject* pointer_shallow_arg_to_python<Ptr>::get_object(Ptr x)

{

to_python_indirect<Ptr,python::detail::make_reference_holder> convert;

return convert(x);

}

template <class T>

inline arg_to_python<T>::arg_to_python(T const& x)

: base(x)

{}

}}} // namespace boost::python::converter

#endif // ARG_TO_PYTHON_DWA200265_HPP

python/include/boost/python/converter/arg_to_python.hpp at develop · rick68/python · GitHub

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