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Trivial refactoring to make the capsule API more user friendly. (#4720)

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* Trivial refactoring to make the capsule API more user friendly.

* Use new API in production code. Thanks @Lalaland for pointing this out.
This commit is contained in:
Ralf W. Grosse-Kunstleve 2023-06-27 15:08:32 -07:00 committed by GitHub
parent e10da79b6e
commit 2fb3d7cbde
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 54 additions and 21 deletions
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2
include/pybind11/pybind11.h
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@ -508,8 +508,8 @@ protected:
rec->def->ml_flags = METH_VARARGS | METH_KEYWORDS;
capsule rec_capsule(unique_rec.release(),
detail::get_function_record_capsule_name(),
[](void *ptr) { destruct((detail::function_record *) ptr); });
rec_capsule.set_name(detail::get_function_record_capsule_name());
guarded_strdup.release();
object scope_module;

51
include/pybind11/pytypes.h
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@ -1925,28 +1925,13 @@ public:
}
}
/// Capsule name is nullptr.
capsule(const void *value, void (*destructor)(void *)) {
m_ptr = PyCapsule_New(const_cast<void *>(value), nullptr, [](PyObject *o) {
// guard if destructor called while err indicator is set
error_scope error_guard;
auto destructor = reinterpret_cast<void (*)(void *)>(PyCapsule_GetContext(o));
if (destructor == nullptr && PyErr_Occurred()) {
throw error_already_set();
}
const char *name = get_name_in_error_scope(o);
void *ptr = PyCapsule_GetPointer(o, name);
if (ptr == nullptr) {
throw error_already_set();
}
initialize_with_void_ptr_destructor(value, nullptr, destructor);
}
if (destructor != nullptr) {
destructor(ptr);
}
});
if (!m_ptr || PyCapsule_SetContext(m_ptr, reinterpret_cast<void *>(destructor)) != 0) {
throw error_already_set();
}
capsule(const void *value, const char *name, void (*destructor)(void *)) {
initialize_with_void_ptr_destructor(value, name, destructor);
}
explicit capsule(void (*destructor)()) {
@ -2014,6 +1999,32 @@ private:
return name;
}
void initialize_with_void_ptr_destructor(const void *value,
const char *name,
void (*destructor)(void *)) {
m_ptr = PyCapsule_New(const_cast<void *>(value), name, [](PyObject *o) {
// guard if destructor called while err indicator is set
error_scope error_guard;
auto destructor = reinterpret_cast<void (*)(void *)>(PyCapsule_GetContext(o));
if (destructor == nullptr && PyErr_Occurred()) {
throw error_already_set();
}
const char *name = get_name_in_error_scope(o);
void *ptr = PyCapsule_GetPointer(o, name);
if (ptr == nullptr) {
throw error_already_set();
}
if (destructor != nullptr) {
destructor(ptr);
}
});
if (!m_ptr || PyCapsule_SetContext(m_ptr, reinterpret_cast<void *>(destructor)) != 0) {
throw error_already_set();
}
}
};
class tuple : public object {

9
tests/test_pytypes.cpp
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@ -260,6 +260,15 @@ TEST_SUBMODULE(pytypes, m) {
});
});
m.def("return_capsule_with_destructor_3", []() {
py::print("creating capsule");
auto cap = py::capsule((void *) 1233, "oname", [](void *ptr) {
py::print("destructing capsule: {}"_s.format((size_t) ptr));
});
py::print("original name: {}"_s.format(cap.name()));
return cap;
});
m.def("return_renamed_capsule_with_destructor_2", []() {
py::print("creating capsule");
auto cap = py::capsule((void *) 1234, [](void *ptr) {

13
tests/test_pytypes.py
View File

@ -319,6 +319,19 @@ def test_capsule(capture):
"""
)
with capture:
a = m.return_capsule_with_destructor_3()
del a
pytest.gc_collect()
assert (
capture.unordered
== """
creating capsule
destructing capsule: 1233
original name: oname
"""
)
with capture:
a = m.return_renamed_capsule_with_destructor_2()
del a