Add deleter roundtrip for const atyp.

Currently failing, custom deleter is lost.

Author: iwanders

tests/test_class_sh_basic.cpp

@@ -72,11 +72,17 @@ struct custom_deleter
     {
         std::default_delete<atyp>()(p);
     }
+    void operator()(const atyp* p) const
+    {
+        std::default_delete<const atyp>()(p);
+    }
 };
 
 std::unique_ptr<atyp,       custom_deleter> rtrn_udmp_del() { return std::unique_ptr<atyp,       custom_deleter>(new atyp{"rtrn_udmp_del"}, custom_deleter{"udmp_deleter"}); }
+std::unique_ptr<atyp const, custom_deleter> rtrn_udcp_del() { return std::unique_ptr<atyp const, custom_deleter>(new atyp{"rtrn_udcp_del"}, custom_deleter{"udcp_deleter"}); }
 
 std::string pass_udmp_del(std::unique_ptr<atyp,       custom_deleter> obj) { return "pass_udmp_del:" + obj->mtxt + "," + obj.get_deleter().delete_txt; }
+std::string pass_udcp_del(std::unique_ptr<atyp const, custom_deleter> obj) { return "pass_udcp_del:" + obj->mtxt + "," + obj.get_deleter().delete_txt; }
 
 // clang-format on
 
@@ -145,7 +151,10 @@ TEST_SUBMODULE(class_sh_basic, m) {
     m.def("pass_udcp", pass_udcp);
 
     m.def("rtrn_udmp_del", rtrn_udmp_del);
+    m.def("rtrn_udcp_del", rtrn_udcp_del);
+
     m.def("pass_udmp_del", pass_udmp_del);
+    m.def("pass_udcp_del", pass_udcp_del);
 
     py::classh<uconsumer>(m, "uconsumer")
         .def(py::init<>())

tests/test_class_sh_basic.py

@@ -64,10 +64,15 @@ def test_load_with_mtxt(pass_f, mtxt, expected):
 def test_load_with_rtrn_f(pass_f, rtrn_f, expected):
     assert pass_f(rtrn_f()) == expected
 
-def test_deleter_roundtrip():
-    t = m.rtrn_udmp_del()
-    r = m.pass_udmp_del(t)
-    assert r == "pass_udmp_del:rtrn_udmp_del,udmp_deleter"
+@pytest.mark.parametrize(
+    ("pass_f", "rtrn_f", "expected"),
+    [
+        (m.pass_udmp_del, m.rtrn_udmp_del, "pass_udmp_del:rtrn_udmp_del,udmp_deleter"),
+        (m.pass_udcp_del, m.rtrn_udcp_del, "pass_udcp_del:rtrn_udcp_del,udcp_deleter"),
+    ],
+)
+def test_deleter_roundtrip(pass_f, rtrn_f, expected):
+    assert pass_f(rtrn_f()) == expected
 
 @pytest.mark.parametrize(
     ("pass_f", "rtrn_f", "expected"),