mirror of
https://github.com/pybind/pybind11.git
synced 2024-11-11 08:03:55 +00:00
bd8985aa0f
* Step 1: Establish new `PYBIND11_SMART_HOLDER_ENABLED` macro, but only under include/pybind11/
At the stage `PYBIND11_HAS_INTERNALS_WITH_SMART_HOLDER_SUPPORT` and `PYBIND11_SMART_HOLDER_ENABLED` are still equivalent.
* Systematically replace all `PYBIND11_HAS_INTERNALS_WITH_SMART_HOLDER_SUPPORT` with `PYBIND11_SMART_HOLDER_ENABLED` under tests/ and ubench/
As at the previous stage, `PYBIND11_HAS_INTERNALS_WITH_SMART_HOLDER_SUPPORT` and `PYBIND11_SMART_HOLDER_ENABLED` are still equivalent.
* Introduce `PYBIND11_SMART_HOLDER_DISABLE` option.
* `#ifdef` out entire `wrap()` function to avoid `unused-parameter` warning-as-error under macos-13
```
/Users/runner/work/pybind11/pybind11/tests/test_class_sh_trampoline_basic.cpp:67:23: error: unused parameter 'm' [-Werror,-Wunused-parameter]
void wrap(py::module_ m, const char *py_class_name) {
^
/Users/runner/work/pybind11/pybind11/tests/test_class_sh_trampoline_basic.cpp:67:38: error: unused parameter 'py_class_name' [-Werror,-Wunused-parameter]
void wrap(py::module_ m, const char *py_class_name) {
^
2 errors generated.
```
108 lines
3.2 KiB
C++
108 lines
3.2 KiB
C++
#include <pybind11/pybind11.h>
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#include <pybind11/smart_holder.h>
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#include "pybind11_tests.h"
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#include <cstddef>
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#include <memory>
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#include <vector>
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namespace test_class_sh_mi_thunks {
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// For general background: https://shaharmike.com/cpp/vtable-part2/
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// C++ vtables - Part 2 - Multiple Inheritance
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// ... the compiler creates a 'thunk' method that corrects `this` ...
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struct Base0 {
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virtual ~Base0() = default;
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Base0() = default;
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Base0(const Base0 &) = delete;
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};
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struct Base1 {
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virtual ~Base1() = default;
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// Using `vector` here because it is known to make this test very sensitive to bugs.
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std::vector<int> vec = {1, 2, 3, 4, 5};
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Base1() = default;
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Base1(const Base1 &) = delete;
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};
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struct Derived : Base1, Base0 {
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~Derived() override = default;
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Derived() = default;
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Derived(const Derived &) = delete;
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};
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} // namespace test_class_sh_mi_thunks
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PYBIND11_SMART_HOLDER_TYPE_CASTERS(test_class_sh_mi_thunks::Base0)
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PYBIND11_SMART_HOLDER_TYPE_CASTERS(test_class_sh_mi_thunks::Base1)
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PYBIND11_SMART_HOLDER_TYPE_CASTERS(test_class_sh_mi_thunks::Derived)
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TEST_SUBMODULE(class_sh_mi_thunks, m) {
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m.attr("defined_PYBIND11_SMART_HOLDER_ENABLED") =
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#ifndef PYBIND11_SMART_HOLDER_ENABLED
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false;
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#else
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true;
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using namespace test_class_sh_mi_thunks;
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m.def("ptrdiff_drvd_base0", []() {
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auto drvd = std::unique_ptr<Derived>(new Derived);
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auto *base0 = dynamic_cast<Base0 *>(drvd.get());
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return std::ptrdiff_t(reinterpret_cast<char *>(drvd.get())
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- reinterpret_cast<char *>(base0));
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});
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py::classh<Base0>(m, "Base0");
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py::classh<Base1>(m, "Base1");
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py::classh<Derived, Base1, Base0>(m, "Derived");
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m.def(
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"get_drvd_as_base0_raw_ptr",
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[]() {
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auto *drvd = new Derived;
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auto *base0 = dynamic_cast<Base0 *>(drvd);
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return base0;
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},
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py::return_value_policy::take_ownership);
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m.def("get_drvd_as_base0_shared_ptr", []() {
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auto drvd = std::make_shared<Derived>();
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auto base0 = std::dynamic_pointer_cast<Base0>(drvd);
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return base0;
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});
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m.def("get_drvd_as_base0_unique_ptr", []() {
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auto drvd = std::unique_ptr<Derived>(new Derived);
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auto base0 = std::unique_ptr<Base0>(std::move(drvd));
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return base0;
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});
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m.def("vec_size_base0_raw_ptr", [](const Base0 *obj) {
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const auto *obj_der = dynamic_cast<const Derived *>(obj);
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if (obj_der == nullptr) {
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return std::size_t(0);
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}
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return obj_der->vec.size();
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});
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m.def("vec_size_base0_shared_ptr", [](const std::shared_ptr<Base0> &obj) -> std::size_t {
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const auto obj_der = std::dynamic_pointer_cast<Derived>(obj);
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if (!obj_der) {
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return std::size_t(0);
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}
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return obj_der->vec.size();
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});
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m.def("vec_size_base0_unique_ptr", [](std::unique_ptr<Base0> obj) -> std::size_t {
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const auto *obj_der = dynamic_cast<const Derived *>(obj.get());
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if (obj_der == nullptr) {
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return std::size_t(0);
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}
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return obj_der->vec.size();
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});
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#endif // PYBIND11_SMART_HOLDER_ENABLED
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}
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