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Add a pybind function to clear a list. (#5153)

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* Add a pybing function to clear a list.

* Add required error handling.

* Add `/* py-non-const */` as suggested by @Skylion007

---------

Co-authored-by: Ralf W. Grosse-Kunstleve <rwgk@google.com>
This commit is contained in:
Thierry Coppey 2024-06-07 22:54:33 +02:00 committed by GitHub
parent 9b3a200065
commit 35ff42b56e
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3 changed files with 8 additions and 0 deletions
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5
include/pybind11/pytypes.h
View File

@ -2183,6 +2183,11 @@ public:
throw error_already_set(); throw error_already_set();
} }
} }
void clear() /* py-non-const */ {
if (PyList_SetSlice(m_ptr, 0, PyList_Size(m_ptr), nullptr) == -1) {
throw error_already_set();
}
}
}; };
class args : public tuple { class args : public tuple {

1
tests/test_pytypes.cpp
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@ -135,6 +135,7 @@ TEST_SUBMODULE(pytypes, m) {
m.def("list_size_t", []() { return py::list{(py::size_t) 0}; }); m.def("list_size_t", []() { return py::list{(py::size_t) 0}; });
m.def("list_insert_ssize_t", [](py::list *l) { return l->insert((py::ssize_t) 1, 83); }); m.def("list_insert_ssize_t", [](py::list *l) { return l->insert((py::ssize_t) 1, 83); });
m.def("list_insert_size_t", [](py::list *l) { return l->insert((py::size_t) 3, 57); }); m.def("list_insert_size_t", [](py::list *l) { return l->insert((py::size_t) 3, 57); });
m.def("list_clear", [](py::list *l) { l->clear(); });
m.def("get_list", []() { m.def("get_list", []() {
py::list list; py::list list;
list.append("value"); list.append("value");

2
tests/test_pytypes.py
View File

@ -65,6 +65,8 @@ def test_list(capture, doc):
assert lins == [1, 83, 2] assert lins == [1, 83, 2]
m.list_insert_size_t(lins) m.list_insert_size_t(lins)
assert lins == [1, 83, 2, 57] assert lins == [1, 83, 2, 57]
m.list_clear(lins)
assert lins == []
with capture: with capture:
lst = m.get_list() lst = m.get_list()