python/include/boost/python/default_call_policies.hpp at python313 · boostorg/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 DEFAULT_CALL_POLICIES_DWA2002131_HPP

# define DEFAULT_CALL_POLICIES_DWA2002131_HPP

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

# include <boost/mpl/if.hpp>

# include <boost/python/to_python_value.hpp>

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

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

# include <boost/mpl/or.hpp>

# include <boost/mpl/front.hpp>

namespace boost { namespace python {

template <class T> struct to_python_value;

namespace detail

{

// for "readable" error messages

template <class T> struct specify_a_return_value_policy_to_wrap_functions_returning

# if defined(__GNUC__) || defined(__EDG__)

{}

# endif

;

}

struct default_result_converter;

struct default_call_policies

{

// Ownership of this argument tuple will ultimately be adopted by

// the caller.

template <class ArgumentPackage>

static bool precall(ArgumentPackage const&)

{

return true;

}

// Pass the result through

template <class ArgumentPackage>

static PyObject* postcall(ArgumentPackage const&, PyObject* result)

{

return result;

}

typedef default_result_converter result_converter;

typedef PyObject* argument_package;

template <class Sig>

struct extract_return_type : mpl::front<Sig>

{

};

struct default_result_converter

{

template <class R>

struct apply

{

typedef typename mpl::if_<

mpl::or_<detail::is_pointer<R>, detail::is_reference<R> >

, detail::specify_a_return_value_policy_to_wrap_functions_returning<R>

, boost::python::to_python_value<

typename detail::value_arg<R>::type

>::type type;

};

// Exceptions for c strings an PyObject*s

template <>

struct default_result_converter::apply<char const*>

{

typedef boost::python::to_python_value<char const*const&> type;

};

template <>

struct default_result_converter::apply<PyObject*>

{

typedef boost::python::to_python_value<PyObject*const&> type;

};

}} // namespace boost::python

#endif // DEFAULT_CALL_POLICIES_DWA2002131_HPP

python/include/boost/python/default_call_policies.hpp at python313 · boostorg/python · GitHub

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