adding test_holder_{shared,unique}_ptr.{cpp,py}

tests/test_holder_shared_ptr.cpp

+// KEEP IN SYNC WITH test_holder_unique_ptr.cpp
+
+#include "pybind11_tests.h"
+
+#include <iostream>
+#include <memory>
+
+namespace pybind11_tests {
+namespace holder_shared_ptr {
+
+inline void to_cout(std::string text) { std::cout << text << std::endl; }
+
+class pointee { // NOT copyable.
+  public:
+    pointee() { to_cout("pointee::pointee()"); }
+
+    int get_int() const {
+        to_cout("pointee::get_int()");
+        return 213;
+    }
+
+    ~pointee() { to_cout("~pointee()"); }
+
+  private:
+    pointee(const pointee &) = delete;
+    pointee(pointee &&) = delete;
+    pointee &operator=(const pointee &) = delete;
+    pointee &operator=(pointee &&) = delete;
+};
+
+inline std::unique_ptr<pointee> make_unique_pointee() {
+    return std::unique_ptr<pointee>(new pointee);
+}
+
+inline std::shared_ptr<pointee> make_shared_pointee() {
+    return std::unique_ptr<pointee>(new pointee);
+}
+
+inline int pass_unique_pointee(std::unique_ptr<pointee> ptr) {
+    return 4000 + ptr->get_int();
+}
+
+inline int pass_shared_pointee(std::shared_ptr<pointee> ptr) {
+    return 5000 + ptr->get_int();
+}
+
+TEST_SUBMODULE(holder_shared_ptr, m) {
+    m.def("to_cout", to_cout);
+
+    py::class_<pointee, std::shared_ptr<pointee>>(m, "pointee")
+        .def(py::init<>())
+        .def("get_int", &pointee::get_int);
+
+    m.def("make_unique_pointee", make_unique_pointee);
+    m.def("make_shared_pointee", make_shared_pointee);
+    // m.def("pass_unique_pointee", pass_unique_pointee);
+    m.def("pass_shared_pointee", pass_shared_pointee);
+}
+
+} // namespace holder_shared_ptr
+} // namespace pybind11_tests

tests/test_holder_shared_ptr.py

+# KEEP IN SYNC WITH test_holder_unique_ptr.py
+# -*- coding: utf-8 -*-
+from pybind11_tests import holder_shared_ptr as m
+
+
+def test_make_unique_pointee():
+    m.to_cout("")
+    m.to_cout("")
+    m.to_cout("make_unique_pointee")
+    obj = m.make_unique_pointee()
+    assert obj.get_int() == 213
+    m.to_cout("")
+
+
+def test_make_shared_pointee():
+    m.to_cout("")
+    m.to_cout("")
+    m.to_cout("make_shared_pointee")
+    obj = m.make_shared_pointee()
+    assert obj.get_int() == 213
+    m.to_cout("")
+
+
+def test_pass_unique_pointee():
+    m.to_cout("")
+    m.to_cout("")
+    m.to_cout("pass_unique_pointee")
+    obj = m.make_shared_pointee()
+    assert obj.get_int() == 213
+    i = m.pass_unique_pointee(obj)
+    assert i == 4213
+    m.to_cout("")
+
+
+def test_pass_shared_pointee():
+    m.to_cout("")
+    m.to_cout("")
+    m.to_cout("pass_shared_pointee")
+    obj = m.make_shared_pointee()
+    assert obj.get_int() == 213
+    i = m.pass_shared_pointee(obj)
+    assert i == 5213
+    m.to_cout("")

tests/test_holder_unique_ptr.cpp

+// KEEP IN SYNC WITH test_holder_shared_ptr.cpp
+
+#include "pybind11_tests.h"
+
+#include <iostream>
+#include <memory>
+
+namespace pybind11_tests {
+namespace holder_unique_ptr {
+
+inline void to_cout(std::string text) { std::cout << text << std::endl; }
+
+class pointee { // NOT copyable.
+  public:
+    pointee() { to_cout("pointee::pointee()"); }
+
+    int get_int() const {
+        to_cout("pointee::get_int()");
+        return 213;
+    }
+
+    ~pointee() { to_cout("~pointee()"); }
+
+  private:
+    pointee(const pointee &) = delete;
+    pointee(pointee &&) = delete;
+    pointee &operator=(const pointee &) = delete;
+    pointee &operator=(pointee &&) = delete;
+};
+
+inline std::unique_ptr<pointee> make_unique_pointee() {
+    return std::unique_ptr<pointee>(new pointee);
+}
+
+inline std::shared_ptr<pointee> make_shared_pointee() {
+    return std::unique_ptr<pointee>(new pointee);
+}
+
+inline int pass_unique_pointee(std::unique_ptr<pointee> ptr) {
+    return 4000 + ptr->get_int();
+}
+
+inline int pass_shared_pointee(std::shared_ptr<pointee> ptr) {
+    return 5000 + ptr->get_int();
+}
+
+TEST_SUBMODULE(holder_unique_ptr, m) {
+    m.def("to_cout", to_cout);
+
+    py::class_<pointee>(m, "pointee")
+        .def(py::init<>())
+        .def("get_int", &pointee::get_int);
+
+    m.def("make_unique_pointee", make_unique_pointee);
+    m.def("make_shared_pointee", make_shared_pointee);
+    // m.def("pass_unique_pointee", pass_unique_pointee);
+    m.def("pass_shared_pointee", pass_shared_pointee);
+}
+
+} // namespace holder_unique_ptr
+} // namespace pybind11_tests

tests/test_holder_unique_ptr.py

+# KEEP IN SYNC WITH test_holder_shared_ptr.py
+# -*- coding: utf-8 -*-
+from pybind11_tests import holder_unique_ptr as m
+
+
+def test_make_unique_pointee():
+    m.to_cout("")
+    m.to_cout("")
+    m.to_cout("make_unique_pointee")
+    obj = m.make_unique_pointee()
+    assert obj.get_int() == 213
+    m.to_cout("")
+
+
+def test_make_shared_pointee():
+    m.to_cout("")
+    m.to_cout("")
+    m.to_cout("make_shared_pointee")
+    obj = m.make_shared_pointee()
+    assert obj.get_int() == 213
+    m.to_cout("")
+
+
+def test_pass_unique_pointee():
+    m.to_cout("")
+    m.to_cout("")
+    m.to_cout("pass_unique_pointee")
+    obj = m.make_unique_pointee()
+    assert obj.get_int() == 213
+    i = m.pass_unique_pointee(obj)
+    assert i == 4213
+    m.to_cout("")
+
+
+def test_pass_shared_pointee():
+    m.to_cout("")
+    m.to_cout("")
+    m.to_cout("pass_shared_pointee")
+    obj = m.make_unique_pointee()
+    assert obj.get_int() == 213
+    i = m.pass_shared_pointee(obj)
+    assert i == 5213
+    m.to_cout("")