mirror of
https://github.com/pybind/pybind11.git
synced 2024-11-26 07:02:11 +00:00
Removing experimental code from here. Will be moved to https://github.com/rwgk/rwgk_tbx.
This commit is contained in:
Ralf W. Grosse-Kunstleve
Ralf W. Grosse-Kunstleve
parent
146a925e4e
commit
ef89a43452
@ -106,7 +106,6 @@ set(PYBIND11_TEST_FILES
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test_class_sh_disowning_mi.cpp
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test_class_sh_factory_constructors.cpp
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test_class_sh_inheritance.cpp
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test_class_sh_shared_from_this.cpp
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test_class_sh_trampoline_basic.cpp
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test_class_sh_trampoline_self_life_support.cpp
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test_class_sh_trampoline_shared_from_this.cpp
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@ -1,239 +0,0 @@
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#include "pybind11_tests.h"
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#include "object.h"
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#include <pybind11/smart_holder.h>
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#include <iostream>
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#include <stdexcept>
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namespace shared_from_this_custom_deleters {
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template <typename T>
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struct labeled_delete {
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std::string label;
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explicit labeled_delete(const std::string &label) : label{label} {}
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void operator()(T *raw_ptr) {
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std::cout << "labeled_delete::operator() " << label << std::endl;
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if (label != "SkipDelete") {
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delete raw_ptr;
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}
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}
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};
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struct Atype : std::enable_shared_from_this<Atype> {};
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#define SHOW_USE_COUNTS \
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std::cout << "obj1, obj2 use_counts: " << obj1.use_count() << ", " << obj2.use_count() \
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<< std::endl;
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void obj1_owns() {
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std::cout << "\nobj1_owns()" << std::endl;
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std::shared_ptr<Atype> obj1(new Atype, labeled_delete<Atype>("1st"));
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std::shared_ptr<Atype> obj2(obj1.get(), labeled_delete<Atype>("SkipDelete"));
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SHOW_USE_COUNTS
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auto sft1 = obj1->shared_from_this();
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SHOW_USE_COUNTS
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auto sft2 = obj2->shared_from_this();
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SHOW_USE_COUNTS
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}
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void obj2_owns() {
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std::cout << "\nobj2_owns()" << std::endl;
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std::shared_ptr<Atype> obj1(new Atype, labeled_delete<Atype>("SkipDelete"));
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std::shared_ptr<Atype> obj2(obj1.get(), labeled_delete<Atype>("2nd"));
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SHOW_USE_COUNTS
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auto sft1 = obj1->shared_from_this();
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SHOW_USE_COUNTS
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auto sft2 = obj2->shared_from_this();
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SHOW_USE_COUNTS
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}
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void obj_sft_reset() {
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std::cout << "\nobj_sft_reset()" << std::endl;
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std::shared_ptr<Atype> obj1(new Atype, labeled_delete<Atype>("SkipDelete"));
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std::shared_ptr<Atype> obj2(obj1.get(), labeled_delete<Atype>("ThisDeletes"));
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std::shared_ptr<Atype> *obj_sft = nullptr;
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std::shared_ptr<Atype> *obj_ign = nullptr;
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{
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auto sft1 = obj1->shared_from_this();
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auto sft2 = obj2->shared_from_this();
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long uc1 = obj1.use_count();
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long uc2 = obj2.use_count();
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if (uc1 == 3 && uc2 == 1) {
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std::cout << "SHARED_FROM_THIS_REFERENT: 1" << std::endl;
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obj_sft = &obj1;
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obj_ign = &obj2;
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} else if (uc1 == 1 && uc2 == 3) {
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std::cout << "SHARED_FROM_THIS_REFERENT: 2" << std::endl;
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obj_sft = &obj2;
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obj_ign = &obj1;
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} else {
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std::cout << "SHARED_FROM_THIS_REFERENT: UNKNOWN" << std::endl;
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}
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}
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if (obj_sft == nullptr)
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throw std::runtime_error("Unexpected `use_count`s.");
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(*obj_sft).reset();
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#if defined(_MSC_VER) && _MSC_VER < 1912
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std::cout << "Preempting \"Windows fatal exception: access violation\": "
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"(*obj_ign)->shared_from_this()"
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<< std::endl;
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#else
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bool got_bad_weak_ptr = false;
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try {
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static_cast<void>((*obj_ign)->shared_from_this());
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} catch (const std::bad_weak_ptr &) {
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got_bad_weak_ptr = true;
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}
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std::cout << "got_bad_weak_ptr: " << got_bad_weak_ptr << std::endl;
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std::shared_ptr<Atype> obj3(obj2.get(), labeled_delete<Atype>("SkipDelete"));
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// Working again based on the shared_ptr that was created after obj_sft was reset:
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static_cast<void>((*obj_ign)->shared_from_this());
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#endif
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}
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} // namespace shared_from_this_custom_deleters
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namespace shared_ptr_reset_and_rescue_pointee_model {
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struct ToBeWrapped : std::enable_shared_from_this<ToBeWrapped> {};
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struct RescuingDeleter;
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struct PyWrapper {
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std::unique_ptr<RescuingDeleter> rdel;
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std::shared_ptr<ToBeWrapped> wobj;
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std::shared_ptr<PyWrapper> self;
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};
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struct RescuingDeleter {
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PyWrapper *pyw;
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explicit RescuingDeleter(PyWrapper *pyw) : pyw{pyw} {}
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void operator()(ToBeWrapped *raw_ptr) {
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if (pyw->self != nullptr) {
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#if defined(__cpp_lib_enable_shared_from_this) && (!defined(_MSC_VER) || _MSC_VER >= 1912)
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assert(raw_ptr->weak_from_this().expired()); // CRITICAL
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#endif
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pyw->wobj = std::shared_ptr<ToBeWrapped>(raw_ptr, *this);
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pyw->self.reset();
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} else {
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delete raw_ptr;
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}
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}
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};
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std::shared_ptr<ToBeWrapped> release_to_cpp(const std::shared_ptr<PyWrapper> &pyw) {
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std::shared_ptr<ToBeWrapped> return_value = pyw->wobj;
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pyw->wobj.reset();
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pyw->self = pyw;
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return return_value;
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}
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void proof_of_concept() {
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std::shared_ptr<PyWrapper> pyw(new PyWrapper);
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pyw->rdel = std::unique_ptr<RescuingDeleter>(new RescuingDeleter(pyw.get()));
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pyw->wobj = std::shared_ptr<ToBeWrapped>(new ToBeWrapped, *pyw->rdel);
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std::shared_ptr<ToBeWrapped> cpp_owner = release_to_cpp(pyw);
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assert(pyw->wobj.get() == nullptr);
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assert(cpp_owner.use_count() == 1);
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{
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std::shared_ptr<ToBeWrapped> sft = cpp_owner->shared_from_this();
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assert(cpp_owner.use_count() == 2);
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}
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assert(cpp_owner.use_count() == 1);
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cpp_owner.reset();
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assert(pyw->wobj.get() != nullptr);
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assert(pyw->wobj.use_count() == 1);
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{
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std::shared_ptr<ToBeWrapped> sft = pyw->wobj->shared_from_this();
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assert(pyw->wobj.use_count() == 2);
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}
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}
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} // namespace shared_ptr_reset_and_rescue_pointee_model
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namespace test_class_sh_shared_from_this {
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// clang-format off
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class MyObject3 : public std::enable_shared_from_this<MyObject3> {
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public:
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MyObject3(const MyObject3 &) = default;
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MyObject3(int value) : value(value) { print_created(this, toString()); }
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std::string toString() const { return "MyObject3[" + std::to_string(value) + "]"; }
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virtual ~MyObject3() { print_destroyed(this); }
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private:
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int value;
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};
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struct SharedFromThisRef {
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struct B : std::enable_shared_from_this<B> {
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B() { print_created(this); }
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B(const B &) : std::enable_shared_from_this<B>() { print_copy_created(this); }
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B(B &&) noexcept : std::enable_shared_from_this<B>() { print_move_created(this); }
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~B() { print_destroyed(this); }
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};
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B value = {};
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std::shared_ptr<B> shared = std::make_shared<B>();
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};
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struct SharedFromThisVBase : std::enable_shared_from_this<SharedFromThisVBase> {
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SharedFromThisVBase() = default;
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SharedFromThisVBase(const SharedFromThisVBase &) = default;
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virtual ~SharedFromThisVBase() = default;
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};
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struct SharedFromThisVirt : virtual SharedFromThisVBase {};
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// clang-format on
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} // namespace test_class_sh_shared_from_this
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using namespace test_class_sh_shared_from_this;
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PYBIND11_SMART_HOLDER_TYPE_CASTERS(MyObject3)
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PYBIND11_SMART_HOLDER_TYPE_CASTERS(SharedFromThisRef::B)
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PYBIND11_SMART_HOLDER_TYPE_CASTERS(SharedFromThisRef)
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PYBIND11_SMART_HOLDER_TYPE_CASTERS(SharedFromThisVirt)
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TEST_SUBMODULE(class_sh_shared_from_this, m) {
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// clang-format off
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py::classh<MyObject3>(m, "MyObject3")
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.def(py::init<int>());
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m.def("make_myobject3_1", []() { return new MyObject3(8); });
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m.def("make_myobject3_2", []() { return std::make_shared<MyObject3>(9); });
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m.def("print_myobject3_1", [](const MyObject3 *obj) { py::print(obj->toString()); });
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m.def("print_myobject3_2", [](std::shared_ptr<MyObject3> obj) { py::print(obj->toString()); }); // NOLINT
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m.def("print_myobject3_3", [](const std::shared_ptr<MyObject3> &obj) { py::print(obj->toString()); });
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// m.def("print_myobject3_4", [](const std::shared_ptr<MyObject3> *obj) { py::print((*obj)->toString()); });
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using B = SharedFromThisRef::B;
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py::classh<B>(m, "B");
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py::classh<SharedFromThisRef>(m, "SharedFromThisRef")
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.def(py::init<>())
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.def_readonly("bad_wp", &SharedFromThisRef::value)
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.def_property_readonly("ref", [](const SharedFromThisRef &s) -> const B & { return *s.shared; })
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.def_property_readonly("copy", [](const SharedFromThisRef &s) { return s.value; },
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py::return_value_policy::automatic) // XXX XXX XXX copy)
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.def_readonly("holder_ref", &SharedFromThisRef::shared)
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.def_property_readonly("holder_copy", [](const SharedFromThisRef &s) { return s.shared; },
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py::return_value_policy::automatic) // XXX XXX XXX copy)
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.def("set_ref", [](SharedFromThisRef &, const B &) { return true; })
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.def("set_holder", [](SharedFromThisRef &, std::shared_ptr<B>) { return true; }); // NOLINT
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static std::shared_ptr<SharedFromThisVirt> sft(new SharedFromThisVirt());
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py::classh<SharedFromThisVirt>(m, "SharedFromThisVirt")
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.def_static("get", []() { return sft.get(); }, py::return_value_policy::reference);
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// clang-format on
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m.def("obj1_owns", shared_from_this_custom_deleters::obj1_owns);
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m.def("obj2_owns", shared_from_this_custom_deleters::obj2_owns);
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m.def("obj_sft_reset", shared_from_this_custom_deleters::obj_sft_reset);
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m.def("shared_ptr_reset_and_rescue_pointee_model_proof_of_concept",
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shared_ptr_reset_and_rescue_pointee_model::proof_of_concept);
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}
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@ -1,132 +0,0 @@
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# -*- coding: utf-8 -*-
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import pytest
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from pybind11_tests import class_sh_shared_from_this as m
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from pybind11_tests import ConstructorStats
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def test_smart_ptr(capture):
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# Object3
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for i, o in zip(
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[9, 8, 9], [m.MyObject3(9), m.make_myobject3_1(), m.make_myobject3_2()]
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):
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print(o)
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with capture:
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m.print_myobject3_1(o)
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m.print_myobject3_2(o)
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m.print_myobject3_3(o)
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m.print_myobject3_3(o) # XXX XXX XXX print_myobject3_4
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assert capture == "MyObject3[{i}]\n".format(i=i) * 4
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cstats = ConstructorStats.get(m.MyObject3)
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assert cstats.alive() == 1
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o = None
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assert cstats.alive() == 0
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assert cstats.values() == ["MyObject3[9]", "MyObject3[8]", "MyObject3[9]"]
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assert cstats.default_constructions == 0
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assert cstats.copy_constructions == 0
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# assert cstats.move_constructions >= 0 # Doesn't invoke any
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assert cstats.copy_assignments == 0
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assert cstats.move_assignments == 0
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def test_shared_from_this_ref():
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s = m.SharedFromThisRef()
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stats = ConstructorStats.get(m.B)
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assert stats.alive() == 2
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ref = s.ref # init_holder_helper(holder_ptr=false, owned=false, bad_wp=false)
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assert stats.alive() == 2
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assert s.set_ref(ref)
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assert s.set_holder(
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ref
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) # std::enable_shared_from_this can create a holder from a reference
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del ref, s
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assert stats.alive() == 0
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def test_shared_from_this_bad_wp():
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s = m.SharedFromThisRef()
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stats = ConstructorStats.get(m.B)
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assert stats.alive() == 2
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bad_wp = s.bad_wp # init_holder_helper(holder_ptr=false, owned=false, bad_wp=true)
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assert stats.alive() == 2
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assert s.set_ref(bad_wp)
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with pytest.raises(RuntimeError) as excinfo:
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assert s.set_holder(bad_wp)
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assert str(excinfo.value) == "Non-owning holder (loaded_as_shared_ptr)."
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del bad_wp, s
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assert stats.alive() == 0
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def test_shared_from_this_copy():
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s = m.SharedFromThisRef()
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stats = ConstructorStats.get(m.B)
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assert stats.alive() == 2
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copy = s.copy # init_holder_helper(holder_ptr=false, owned=true, bad_wp=false)
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# RuntimeError: Invalid return_value_policy for shared_ptr.
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assert stats.alive() == 3
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assert s.set_ref(copy)
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assert s.set_holder(copy)
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del copy, s
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assert stats.alive() == 0
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def test_shared_from_this_holder_ref():
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s = m.SharedFromThisRef()
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stats = ConstructorStats.get(m.B)
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assert stats.alive() == 2
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holder_ref = (
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s.holder_ref
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) # init_holder_helper(holder_ptr=true, owned=false, bad_wp=false)
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assert stats.alive() == 2
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assert s.set_ref(holder_ref)
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assert s.set_holder(holder_ref)
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del holder_ref, s
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assert stats.alive() == 0
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def test_shared_from_this_holder_copy():
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s = m.SharedFromThisRef()
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stats = ConstructorStats.get(m.B)
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assert stats.alive() == 2
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holder_copy = (
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# RuntimeError: Invalid return_value_policy for shared_ptr.
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s.holder_copy
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) # init_holder_helper(holder_ptr=true, owned=true, bad_wp=false)
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assert stats.alive() == 2
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assert s.set_ref(holder_copy)
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assert s.set_holder(holder_copy)
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del holder_copy, s
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assert stats.alive() == 0
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def test_shared_from_this_virt():
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z = m.SharedFromThisVirt.get()
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y = m.SharedFromThisVirt.get()
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assert y is z
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@pytest.mark.parametrize(
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"test_func",
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[
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m.obj1_owns,
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m.obj2_owns,
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m.obj_sft_reset,
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],
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)
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def test_shared_from_this_custom_deleters(test_func):
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test_func()
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def test_shared_ptr_reset_and_rescue_pointee_model(loop_count_max=10 ** 6):
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loop_count = 0
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while True:
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m.shared_ptr_reset_and_rescue_pointee_model_proof_of_concept()
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loop_count += 1
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if loop_count == loop_count_max:
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break
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