/usr/include/boost/python
Edit: /usr/include/boost/python/with_custodian_and_ward.hpp (3546B)
// 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 WITH_CUSTODIAN_AND_WARD_DWA2002131_HPP
# define WITH_CUSTODIAN_AND_WARD_DWA2002131_HPP
# include
# include
# include
# include
namespace boost { namespace python {
namespace detail
{
template
struct get_prev
{
template
static PyObject* execute(ArgumentPackage const& args, PyObject* = 0)
{
int const pre_n = static_cast(N) - 1; // separate line is gcc-2.96 workaround
return detail::get(mpl::int_(), args);
}
};
template <>
struct get_prev<0>
{
template
static PyObject* execute(ArgumentPackage const&, PyObject* zeroth)
{
return zeroth;
}
};
}
template <
std::size_t custodian
, std::size_t ward
, class BasePolicy_ = default_call_policies
>
struct with_custodian_and_ward : BasePolicy_
{
BOOST_STATIC_ASSERT(custodian != ward);
BOOST_STATIC_ASSERT(custodian > 0);
BOOST_STATIC_ASSERT(ward > 0);
template
static bool precall(ArgumentPackage const& args_)
{
unsigned arity_ = detail::arity(args_);
if (custodian > arity_ || ward > arity_)
{
PyErr_SetString(
PyExc_IndexError
, "boost::python::with_custodian_and_ward: argument index out of range"
);
return false;
}
PyObject* patient = detail::get_prev::execute(args_);
PyObject* nurse = detail::get_prev::execute(args_);
PyObject* life_support = python::objects::make_nurse_and_patient(nurse, patient);
if (life_support == 0)
return false;
bool result = BasePolicy_::precall(args_);
if (!result) {
Py_DECREF(life_support);
}
return result;
}
};
template
struct with_custodian_and_ward_postcall : BasePolicy_
{
BOOST_STATIC_ASSERT(custodian != ward);
template
static PyObject* postcall(ArgumentPackage const& args_, PyObject* result)
{
std::size_t arity_ = detail::arity(args_);
// check if either custodian or ward exceeds the arity
// (this weird formulation avoids "always false" warnings
// for arity_ = 0)
if ( (std::max)(custodian, ward) > arity_ )
{
PyErr_SetString(
PyExc_IndexError
, "boost::python::with_custodian_and_ward_postcall: argument index out of range"
);
return 0;
}
PyObject* patient = detail::get_prev::execute(args_, result);
PyObject* nurse = detail::get_prev::execute(args_, result);
if (nurse == 0) return 0;
result = BasePolicy_::postcall(args_, result);
if (result == 0)
return 0;
if (python::objects::make_nurse_and_patient(nurse, patient) == 0)
{
Py_XDECREF(result);
return 0;
}
return result;
}
};
}} // namespace boost::python
#endif // WITH_CUSTODIAN_AND_WARD_DWA2002131_HPP