| 27 | |
| 28 | template<class T> |
| 29 | void init_ref_iterator(nanobind::handle& m, const char* it_name) { |
| 30 | using ElementTy = typename T::value_type; |
| 31 | |
| 32 | if (auto type = nb::type<T>(); type.is_valid()) { |
| 33 | m.attr(it_name) = type; |
| 34 | return; |
| 35 | } |
| 36 | |
| 37 | nb::class_<T>(m, it_name) |
| 38 | .def_prop_ro_static("__doc__", |
| 39 | [] (const nb::object&) -> std::string { |
| 40 | using namespace std::literals; |
| 41 | if (auto type = nb::type<ElementTy>(); type.is_valid()) { |
| 42 | nb::str name = nb::type_name(type); |
| 43 | return "Iterator over :class:`"s + name.c_str() + "`"; |
| 44 | } |
| 45 | return ""; |
| 46 | }) |
| 47 | |
| 48 | .def("__getitem__", |
| 49 | [] (T& v, Py_ssize_t i) -> typename T::reference { |
| 50 | const size_t size = v.size(); |
| 51 | if (i < 0) { |
| 52 | i += static_cast<Py_ssize_t>(size); |
| 53 | } |
| 54 | if (i < 0 || static_cast<size_t>(i) >= size) { |
| 55 | throw nb::index_error(); |
| 56 | } |
| 57 | return v[i]; |
| 58 | }, |
| 59 | nb::rv_policy::reference_internal) |
| 60 | |
| 61 | .def("__len__", |
| 62 | [] (T& v) { |
| 63 | return v.size(); |
| 64 | }) |
| 65 | |
| 66 | .def("__iter__", |
| 67 | [] (const T& v) { |
| 68 | return v; |
| 69 | }, nb::rv_policy::reference_internal) |
| 70 | |
| 71 | .def("__next__", |
| 72 | [] (T& v) -> typename T::reference { |
| 73 | if (v == std::end(v)) { |
| 74 | throw nb::stop_iteration(); |
| 75 | } |
| 76 | auto& value = *v; |
| 77 | ++v; |
| 78 | return value; |
| 79 | }, nb::rv_policy::reference_internal); |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | #endif |