// Extract an object x of the Target type from the first Python
// argument, and invoke get_start(x)/get_finish(x) to produce
// iterators, which are used to construct a new iterator_range<>
// object that gets wrapped into a Python iterator.
iterator_range<NextPolicies,Iterator>
operator()(back_reference<Target&> x) const
{
// Make sure the Python class is instantiated.
detail::demand_iterator_class("iterator", (Iterator*)0, NextPolicies());
return iterator_range<NextPolicies,Iterator>(
x.source()
, m_get_start(x.get())
, m_get_finish(x.get())
);
}
// Extract an object x of the Target type from the first Python
// argument, and invoke get_start(x)/get_finish(x) to produce
// iterators, which are used to construct a new iterator_range<>
// object that gets wrapped into a Python iterator.
static PyObject* create(
Accessor1 const& get_start, Accessor2 const& get_finish
, PyObject* args_, PyObject* /*kw*/)
{
// Make sure the Python class is instantiated.
detail::demand_iterator_class("iterator", (Iterator*)0, NextPolicies());
to_python_value<iterator_range<NextPolicies,Iterator> > cr;
// Extract x from the first argument
PyObject* arg0 = PyTuple_GET_ITEM(args_, 0);
arg_from_python<Target> c0(arg0);
if (!c0.convertible()) return 0;
typename arg_from_python<Target>::result_type x = c0(arg0);
// Build and convert the iterator_range<>.
return cr(
iterator_range<NextPolicies,Iterator>(
object((python::detail::borrowed_reference)arg0)
, get_start(x), get_finish(x)));
}
object demand_iterator_class(char const* name, Iterator* = 0, NextPolicies const& policies = NextPolicies())
{
typedef iterator_range<NextPolicies,Iterator> range_;
// Check the registry. If one is already registered, return it.
handle<> class_obj(
objects::registered_class_object(python::type_id<range_>()));
if (class_obj.get() != 0)
return object(class_obj);
typedef typename range_::next_fn next_fn;
typedef typename next_fn::result_type result_type;
return class_<range_>(name, no_init)
.def("__iter__", identity_function())
.def(
#if PY_VERSION_HEX >= 0x03000000
"__next__"
#else
"next"
#endif
, make_function(
next_fn()
, policies
, mpl::vector2<result_type,range_&>()
));
}
object demand_iterator_class(char const* name, Iterator* = 0, NextPolicies const& policies = NextPolicies())
{
typedef iterator_range<NextPolicies,Iterator> range_;
// Check the registry. If one is already registered, return it.
handle<> class_obj(
objects::registered_class_object(python::type_id<range_>()));
if (class_obj.get() != 0)
return object(class_obj);
// Make a callable object which can be used as the iterator's next() function.
object next_function =
objects::function_object(
bind(&detail::iterator_next<Iterator,NextPolicies>::execute, _1, _2, policies)
, 1);
return class_<range_>(name, no_init)
.def("__iter__", identity_function())
.setattr("next", next_function)
;
}
