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4766065e5c
* Content of PR #4374 applied on top of smart_holder branch. * More tests, with USE_SH switch. [ci skip] * Use `std::dynamic_pointer_cast<Base0>` [ci skip] * All tests pass when using `m.make_derived_as_base0_raw_ptr()`, with `USE_SH` defined or not defined. [ci skip] * WIP * Debug LOOOK & one-line bug fix: ```diff - auto smhldr = pybindit::memory::smart_holder::from_shared_ptr(src); + auto smhldr = pybindit::memory::smart_holder::from_shared_ptr(std::shared_ptr<void>(src, const_cast<void *>(st.first))); ``` * Remove all print LOOOK and clang-format the fix. * Resolve clang-tidy errors. * Systematic test matrix. * Bug fix in `smart_holder_type_caster<std::unique_ptr<T, D>>::cast()` * Rename: test_mi_debug -> test_class_sh_mi_thunks * Add `test_ptrdiff_derived_base0()` * Miscellaneous polishing (naming, comments). No functional changes. * Improve test_class_sh_mi_thunks.py implementation. No change in test coverage. * Resolve clang-tidy error.
101 lines
3.0 KiB
C++
101 lines
3.0 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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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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}
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