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parameterize iterators by return value policy (fixes #388)

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This commit is contained in:
Wenzel Jakob 2016-09-10 16:00:50 +09:00
parent 720136bfa7
commit b212f6c416
4 changed files with 35 additions and 15 deletions
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26
include/pybind11/pybind11.h
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@ -1175,7 +1175,7 @@ PYBIND11_NOINLINE inline void keep_alive_impl(int Nurse, int Patient, handle arg
keep_alive_impl(nurse, patient);
}
template <typename Iterator, typename Sentinel, bool KeyIterator, typename... Extra>
template <typename Iterator, typename Sentinel, bool KeyIterator, return_value_policy Policy>
struct iterator_state {
Iterator it;
Sentinel end;
@ -1187,12 +1187,13 @@ NAMESPACE_END(detail)
template <typename... Args> detail::init<Args...> init() { return detail::init<Args...>(); }
template <typename... Args> detail::init_alias<Args...> init_alias() { return detail::init_alias<Args...>(); }
template <typename Iterator,
template <return_value_policy Policy = return_value_policy::reference_internal,
typename Iterator,
typename Sentinel,
typename ValueType = decltype(*std::declval<Iterator>()),
typename... Extra>
iterator make_iterator(Iterator first, Sentinel last, Extra &&... extra) {
typedef detail::iterator_state<Iterator, Sentinel, false, Extra...> state;
typedef detail::iterator_state<Iterator, Sentinel, false, Policy> state;
if (!detail::get_type_info(typeid(state))) {
class_<state>(handle(), "iterator")
@ -1205,18 +1206,19 @@ iterator make_iterator(Iterator first, Sentinel last, Extra &&... extra) {
if (s.it == s.end)
throw stop_iteration();
return *s.it;
}, return_value_policy::reference_internal, std::forward<Extra>(extra)...);
}, std::forward<Extra>(extra)..., Policy);
}
return (iterator) cast(state { first, last, true });
}
template <typename Iterator,
template <return_value_policy Policy = return_value_policy::reference_internal,
typename Iterator,
typename Sentinel,
typename KeyType = decltype((*std::declval<Iterator>()).first),
typename... Extra>
iterator make_key_iterator(Iterator first, Sentinel last, Extra &&... extra) {
typedef detail::iterator_state<Iterator, Sentinel, true, Extra...> state;
typedef detail::iterator_state<Iterator, Sentinel, true, Policy> state;
if (!detail::get_type_info(typeid(state))) {
class_<state>(handle(), "iterator")
@ -1229,18 +1231,20 @@ iterator make_key_iterator(Iterator first, Sentinel last, Extra &&... extra) {
if (s.it == s.end)
throw stop_iteration();
return (*s.it).first;
}, return_value_policy::reference_internal, std::forward<Extra>(extra)...);
}, std::forward<Extra>(extra)..., Policy);
}
return (iterator) cast(state { first, last, true });
}
template <typename Type, typename... Extra> iterator make_iterator(Type &value, Extra&&... extra) {
return make_iterator(std::begin(value), std::end(value), extra...);
template <return_value_policy Policy = return_value_policy::reference_internal,
typename Type, typename... Extra> iterator make_iterator(Type &value, Extra&&... extra) {
return make_iterator<Policy>(std::begin(value), std::end(value), extra...);
}
template <typename Type, typename... Extra> iterator make_key_iterator(Type &value, Extra&&... extra) {
return make_key_iterator(std::begin(value), std::end(value), extra...);
template <return_value_policy Policy = return_value_policy::reference_internal,
typename Type, typename... Extra> iterator make_key_iterator(Type &value, Extra&&... extra) {
return make_key_iterator<Policy>(std::begin(value), std::end(value), extra...);
}
template <typename InputType, typename OutputType> void implicitly_convertible() {

4
include/pybind11/stl_bind.h
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@ -247,7 +247,9 @@ pybind11::class_<Vector, holder_type> bind_vector(pybind11::module &m, std::stri
cl.def("__iter__",
[](Vector &v) {
return pybind11::make_iterator<ItType, ItType, T>(v.begin(), v.end());
return pybind11::make_iterator<
return_value_policy::reference_internal, ItType, ItType, T>(
v.begin(), v.end());
},
pybind11::keep_alive<0, 1>() /* Essential: keep list alive while iterator exists */
);

5
tests/test_issues.cpp
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@ -233,6 +233,11 @@ void init_issues(py::module &m) {
.def(py::self + py::self)
.def("__add__", [](const OpTest2& c2, const OpTest1& c1) { return c2 + c1; })
.def("__radd__", [](const OpTest2& c2, const OpTest1& c1) { return c2 + c1; });
// Issue 388: Can't make iterators via make_iterator() with different r/v policies
static std::vector<int> list = { 1, 2, 3 };
m2.def("make_iterator_1", []() { return py::make_iterator<py::return_value_policy::copy>(list); });
m2.def("make_iterator_2", []() { return py::make_iterator<py::return_value_policy::automatic>(list); });
}
// MSVC workaround: trying to use a lambda here crashes MSCV

9
tests/test_issues.py
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@ -170,3 +170,12 @@ def test_operators_notimplemented(capture):
Add OpTest2 with OpTest2
Add OpTest2 with OpTest1
Add OpTest2 with OpTest1"""
def test_iterator_rvpolicy():
""" Issue 388: Can't make iterators via make_iterator() with different r/v policies """
from pybind11_tests.issues import make_iterator_1
from pybind11_tests.issues import make_iterator_2
assert list(make_iterator_1()) == [1, 2, 3]
assert list(make_iterator_2()) == [1, 2, 3]
assert(type(make_iterator_1()) != type(make_iterator_2()))