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// Copyright (c) 2021 The Pybind Development Team.
// All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "pybind11_tests.h"
#include <memory>
#include <string>
namespace pybind11_tests {
namespace class_sh_trampoline_shared_from_this {
struct Sft : std::enable_shared_from_this<Sft> {
std::string history;
explicit Sft(const std::string &history_seed) : history{history_seed} {}
virtual ~Sft() = default;
#if defined(__clang__)
// "Group of 4" begin.
// This group is not meant to be used, but will leave a trace in the
// history in case something goes wrong.
// However, compilers other than clang have a variety of issues. It is not
// worth the trouble covering all platforms.
Sft(const Sft &other) : enable_shared_from_this(other) { history = other.history + "_CpCtor"; }
Sft(Sft &&other) noexcept { history = other.history + "_MvCtor"; }
Sft &operator=(const Sft &other) {
history = other.history + "_OpEqLv";
return *this;
}
Sft &operator=(Sft &&other) noexcept {
history = other.history + "_OpEqRv";
return *this;
}
// "Group of 4" end.
#endif
};
struct SftSharedPtrStash {
int ser_no;
std::vector<std::shared_ptr<Sft>> stash;
explicit SftSharedPtrStash(int ser_no) : ser_no{ser_no} {}
void Clear() { stash.clear(); }
void Add(const std::shared_ptr<Sft> &obj) {
if (!obj->history.empty()) {
obj->history += "_Stash" + std::to_string(ser_no) + "Add";
}
stash.push_back(obj);
}
void AddSharedFromThis(Sft *obj) {
auto sft = obj->shared_from_this();
if (!sft->history.empty()) {
sft->history += "_Stash" + std::to_string(ser_no) + "AddSharedFromThis";
}
stash.push_back(sft);
}
std::string history(unsigned i) {
if (i < stash.size()) {
return stash[i]->history;
}
return "OutOfRange";
}
long use_count(unsigned i) {
if (i < stash.size()) {
return stash[i].use_count();
}
return -1;
}
};
struct SftTrampoline : Sft, py::trampoline_self_life_support {
using Sft::Sft;
};
long use_count(const std::shared_ptr<Sft> &obj) { return obj.use_count(); }
long pass_shared_ptr(const std::shared_ptr<Sft> &obj) {
auto sft = obj->shared_from_this();
if (!sft->history.empty()) {
sft->history += "_PassSharedPtr";
}
return sft.use_count();
}
std::string pass_unique_ptr_cref(const std::unique_ptr<Sft> &obj) {
return obj ? obj->history : "<NULLPTR>";
}
void pass_unique_ptr_rref(std::unique_ptr<Sft> &&) {
throw std::runtime_error("Expected to not be reached.");
}
Sft *make_pure_cpp_sft_raw_ptr(const std::string &history_seed) { return new Sft{history_seed}; }
std::unique_ptr<Sft> make_pure_cpp_sft_unq_ptr(const std::string &history_seed) {
return std::unique_ptr<Sft>(new Sft{history_seed});
}
std::shared_ptr<Sft> make_pure_cpp_sft_shd_ptr(const std::string &history_seed) {
return std::make_shared<Sft>(history_seed);
}
std::shared_ptr<Sft> pass_through_shd_ptr(const std::shared_ptr<Sft> &obj) { return obj; }
} // namespace class_sh_trampoline_shared_from_this
} // namespace pybind11_tests
using namespace pybind11_tests::class_sh_trampoline_shared_from_this;
TEST_SUBMODULE(class_sh_trampoline_shared_from_this, m) {
py::classh<Sft, SftTrampoline>(m, "Sft")
.def(py::init<const std::string &>())
.def(py::init([](const std::string &history, int) {
return std::make_shared<SftTrampoline>(history);
}))
.def_readonly("history", &Sft::history)
// This leads to multiple entries in registered_instances:
.def(py::init([](const std::shared_ptr<Sft> &existing) { return existing; }));
py::classh<SftSharedPtrStash>(m, "SftSharedPtrStash")
.def(py::init<int>())
.def("Clear", &SftSharedPtrStash::Clear)
.def("Add", &SftSharedPtrStash::Add)
.def("AddSharedFromThis", &SftSharedPtrStash::AddSharedFromThis)
.def("history", &SftSharedPtrStash::history)
.def("use_count", &SftSharedPtrStash::use_count);
m.def("use_count", use_count);
m.def("pass_shared_ptr", pass_shared_ptr);
m.def("pass_unique_ptr_cref", pass_unique_ptr_cref);
m.def("pass_unique_ptr_rref", pass_unique_ptr_rref);
m.def("make_pure_cpp_sft_raw_ptr", make_pure_cpp_sft_raw_ptr);
m.def("make_pure_cpp_sft_unq_ptr", make_pure_cpp_sft_unq_ptr);
m.def("make_pure_cpp_sft_shd_ptr", make_pure_cpp_sft_shd_ptr);
m.def("pass_through_shd_ptr", pass_through_shd_ptr);
}
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