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feature: Support move-only iterators in py::make_*iterator (#4834)

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* feature: Support move-only iterators in `py::make_*iterator`

* fix: Missing static assertion message

* fixup: Missing `explicit` in single argument constructors

* fix: Simplify tests: make existing iterator move-only

* fix: Missing `noexcept`
This commit is contained in:
Sergei Izmailov 2023-09-07 21:57:39 +09:00 committed by GitHub
parent 4a2f7e4681
commit c83605936b
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2 changed files with 29 additions and 4 deletions
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14
include/pybind11/pybind11.h
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@ -2434,7 +2434,7 @@ iterator make_iterator_impl(Iterator first, Sentinel last, Extra &&...extra) {
Policy);
}
return cast(state{first, last, true});
return cast(state{std::forward<Iterator>(first), std::forward<Sentinel>(last), true});
}
PYBIND11_NAMESPACE_END(detail)
@ -2451,7 +2451,9 @@ iterator make_iterator(Iterator first, Sentinel last, Extra &&...extra) {
Iterator,
Sentinel,
ValueType,
Extra...>(first, last, std::forward<Extra>(extra)...);
Extra...>(std::forward<Iterator>(first),
std::forward<Sentinel>(last),
std::forward<Extra>(extra)...);
}
/// Makes a python iterator over the keys (`.first`) of a iterator over pairs from a
@ -2467,7 +2469,9 @@ iterator make_key_iterator(Iterator first, Sentinel last, Extra &&...extra) {
Iterator,
Sentinel,
KeyType,
Extra...>(first, last, std::forward<Extra>(extra)...);
Extra...>(std::forward<Iterator>(first),
std::forward<Sentinel>(last),
std::forward<Extra>(extra)...);
}
/// Makes a python iterator over the values (`.second`) of a iterator over pairs from a
@ -2483,7 +2487,9 @@ iterator make_value_iterator(Iterator first, Sentinel last, Extra &&...extra) {
Iterator,
Sentinel,
ValueType,
Extra...>(first, last, std::forward<Extra>(extra)...);
Extra...>(std::forward<Iterator>(first),
std::forward<Sentinel>(last),
std::forward<Extra>(extra)...);
}
/// Makes an iterator over values of an stl container or other container supporting

19
tests/test_sequences_and_iterators.cpp
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@ -28,6 +28,13 @@ class NonZeroIterator {
public:
explicit NonZeroIterator(const T *ptr) : ptr_(ptr) {}
// Make the iterator non-copyable and movable
NonZeroIterator(const NonZeroIterator &) = delete;
NonZeroIterator(NonZeroIterator &&) noexcept = default;
NonZeroIterator &operator=(const NonZeroIterator &) = delete;
NonZeroIterator &operator=(NonZeroIterator &&) noexcept = default;
const T &operator*() const { return *ptr_; }
NonZeroIterator &operator++() {
++ptr_;
@ -78,6 +85,7 @@ private:
int value_;
};
using NonCopyableIntPair = std::pair<NonCopyableInt, NonCopyableInt>;
PYBIND11_MAKE_OPAQUE(std::vector<NonCopyableInt>);
PYBIND11_MAKE_OPAQUE(std::vector<NonCopyableIntPair>);
@ -375,6 +383,17 @@ TEST_SUBMODULE(sequences_and_iterators, m) {
private:
std::vector<std::pair<int, int>> data_;
};
{
// #4383 : Make sure `py::make_*iterator` functions work with move-only iterators
using iterator_t = NonZeroIterator<std::pair<int, int>>;
static_assert(std::is_move_assignable<iterator_t>::value, "");
static_assert(std::is_move_constructible<iterator_t>::value, "");
static_assert(!std::is_copy_assignable<iterator_t>::value, "");
static_assert(!std::is_copy_constructible<iterator_t>::value, "");
}
py::class_<IntPairs>(m, "IntPairs")
.def(py::init<std::vector<std::pair<int, int>>>())
.def(