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#include <nanobind/make_iterator.h>
#include <nanobind/stl/unordered_map.h>
#include <nanobind/stl/string.h>
namespace nb = nanobind;
NB_MODULE(test_make_iterator_ext, m) {
struct StringMap {
std::unordered_map<std::string, std::string> map;
decltype(map.cbegin()) begin() const { return map.cbegin(); }
decltype(map.cend()) end() const { return map.cend(); }
};
nb::class_<StringMap>(m, "StringMap")
.def(nb::init<>())
.def(nb::init<std::unordered_map<std::string, std::string>>())
.def("__iter__",
[](const StringMap &map) {
return nb::make_key_iterator(nb::type<StringMap>(),
"key_iterator",
map.begin(),
map.end());
}, nb::keep_alive<0, 1>())
.def("items",
[](const StringMap &map) {
return nb::make_iterator(nb::type<StringMap>(),
"item_iterator",
map.begin(),
map.end());
}, nb::keep_alive<0, 1>())
.def("items_l",
[](const StringMap &map) {
// Make sure iterators don't dangle even if passed as lvalue
auto begin = map.begin(), end = map.end();
return nb::make_iterator(nb::type<StringMap>(),
"item_iterator_l",
begin, end);
}, nb::keep_alive<0, 1>())
.def("values", [](const StringMap &map) {
return nb::make_value_iterator(nb::type<StringMap>(),
"value_iterator",
map.begin(),
map.end());
}, nb::keep_alive<0, 1>());
nb::handle mod = m;
m.def("iterator_passthrough", [mod](nb::iterator s) -> nb::iterator {
return nb::make_iterator(mod, "pt_iterator", std::begin(s), std::end(s));
});
// test of map where dereferencing the iterator returns a value,
// not a reference
struct IdentityMap {
struct iterator {
int val;
std::pair<int, int> operator*() const { return {val, val}; }
iterator& operator++() { ++val; return *this; }
bool operator==(const iterator& other) const {
return val == other.val;
}
};
iterator begin() const { return iterator{0}; }
iterator end() const { return iterator{10}; }
};
nb::class_<IdentityMap>(m, "IdentityMap")
.def(nb::init<>())
.def("__iter__",
[](const IdentityMap &map) {
return nb::make_key_iterator(nb::type<IdentityMap>(),
"key_iterator",
map.begin(),
map.end());
}, nb::keep_alive<0, 1>())
.def("items",
[](const IdentityMap &map) {
return nb::make_iterator(nb::type<IdentityMap>(),
"item_iterator",
map.begin(),
map.end());
}, nb::keep_alive<0, 1>())
.def("items_l",
[](const IdentityMap &map) {
auto begin = map.begin(), end = map.end();
return nb::make_iterator(nb::type<IdentityMap>(),
"item_iterator_l",
begin, end);
}, nb::keep_alive<0, 1>())
.def("values", [](const IdentityMap &map) {
return nb::make_value_iterator(nb::type<IdentityMap>(),
"value_iterator",
map.begin(),
map.end());
}, nb::keep_alive<0, 1>());
nb::list all;
all.append("iterator_passthrough");
all.append("StringMap");
all.append("IdentityMap");
m.attr("__all__") = all;
}
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