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Adding unit test: test_multiple_registered_instances_for_same_pointee
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@ -411,7 +411,9 @@ struct smart_holder_type_caster_load {
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return to_be_released;
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}
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if (std::get_deleter<shared_ptr_dec_ref_deleter>(hld.vptr) != nullptr) {
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// SMART_HOLDER_WIP: unit test coverage.
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// This code is reachable only if there are multiple registered_instances for the
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// same pointee.
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// SMART_HOLDER_WIP: keep weak_ref?
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std::shared_ptr<void> void_shd_ptr = hld.template as_shared_ptr<void>();
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return std::shared_ptr<T>(void_shd_ptr, type_raw_ptr);
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}
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@ -94,6 +94,8 @@ std::shared_ptr<Sft> make_pure_cpp_sft_shd_ptr(const std::string &history_seed)
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return std::make_shared<Sft>(history_seed);
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}
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std::shared_ptr<Sft> pass_through_shd_ptr(const std::shared_ptr<Sft> &obj) { return obj; }
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} // namespace
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PYBIND11_SMART_HOLDER_TYPE_CASTERS(Sft)
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@ -102,7 +104,9 @@ PYBIND11_SMART_HOLDER_TYPE_CASTERS(SftSharedPtrStash)
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TEST_SUBMODULE(class_sh_trampoline_shared_from_this, m) {
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py::classh<Sft, SftTrampoline>(m, "Sft")
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.def(py::init<std::string>())
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.def_readonly("history", &Sft::history);
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.def_readonly("history", &Sft::history)
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// This leads to multiple entries in registered_instances:
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.def(py::init([](const std::shared_ptr<Sft> &existing) { return existing; }));
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py::classh<SftSharedPtrStash>(m, "SftSharedPtrStash")
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.def(py::init<int>())
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@ -118,4 +122,5 @@ TEST_SUBMODULE(class_sh_trampoline_shared_from_this, m) {
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m.def("make_pure_cpp_sft_raw_ptr", make_pure_cpp_sft_raw_ptr);
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m.def("make_pure_cpp_sft_unq_ptr", make_pure_cpp_sft_unq_ptr);
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m.def("make_pure_cpp_sft_shd_ptr", make_pure_cpp_sft_shd_ptr);
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m.def("pass_through_shd_ptr", pass_through_shd_ptr);
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}
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@ -153,3 +153,21 @@ def test_pure_cpp_sft_raw_ptr(make_f):
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stash1 = m.SftSharedPtrStash(1)
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stash1.AddSharedFromThis(obj)
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assert obj.history == "PureCppSft_Stash1AddSharedFromThis"
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def test_multiple_registered_instances_for_same_pointee():
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obj0 = PySft("PySft")
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obj0.attachment_in_dict = "Obj0"
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assert m.pass_through_shd_ptr(obj0) is obj0
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while True:
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obj = m.Sft(obj0)
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assert obj is not obj0
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obj_pt = m.pass_through_shd_ptr(obj)
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# Unpredictable! Because registered_instances is as std::unordered_multimap.
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assert obj_pt is obj0 or obj_pt is obj
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# Multiple registered_instances for the same pointee can lead to unpredictable results:
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if obj_pt is obj0:
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assert obj_pt.attachment_in_dict == "Obj0"
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else:
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assert not hasattr(obj_pt, "attachment_in_dict")
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break # Comment out for manual leak checking (use `top` command).
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