From 874f69d898cb468d0f1f61545cb8002ff4d02c00 Mon Sep 17 00:00:00 2001
From: "Ralf W. Grosse-Kunstleve" <rwgk@google.com>
Date: Thu, 4 Jul 2024 16:09:01 -0700
Subject: [PATCH] Add `cast(const std::unique_ptr<type, deleter> &, ...)`.
 Remove the last 3 remaining BAKEIN_BREAK in test_class_sh_basic.cpp

---
 include/pybind11/cast.h       | 14 ++++++++++++++
 tests/test_class_sh_basic.cpp |  7 +++----
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/include/pybind11/cast.h b/include/pybind11/cast.h
index a481a30e6..4d15cafa6 100644
--- a/include/pybind11/cast.h
+++ b/include/pybind11/cast.h
@@ -988,6 +988,20 @@ public:
             std::move(src), policy, parent);
     }
 
+    static handle
+    cast(const std::unique_ptr<type, deleter> &src, return_value_policy policy, handle parent) {
+        if (!src) {
+            return none().release();
+        }
+        if (policy == return_value_policy::automatic) {
+            policy = return_value_policy::reference_internal;
+        }
+        if (policy != return_value_policy::reference_internal) {
+            throw cast_error("Invalid return_value_policy for unique_ptr&");
+        }
+        return type_caster_base<type>::cast(src.get(), policy, parent);
+    }
+
     bool load(handle src, bool convert) {
         return base::template load_impl<
             move_only_holder_caster<type, std::unique_ptr<type, deleter>>>(src, convert);
diff --git a/tests/test_class_sh_basic.cpp b/tests/test_class_sh_basic.cpp
index e41f77176..fb9395180 100644
--- a/tests/test_class_sh_basic.cpp
+++ b/tests/test_class_sh_basic.cpp
@@ -202,9 +202,8 @@ TEST_SUBMODULE(class_sh_basic, m) {
         .def("pass_valu", &uconsumer::pass_valu)
         .def("pass_rref", &uconsumer::pass_rref)
         .def("rtrn_valu", &uconsumer::rtrn_valu)
-        // BAKEIN_BREAK .def("rtrn_lref", &uconsumer::rtrn_lref)
-        // BAKEIN_BREAK .def("rtrn_cref", &uconsumer::rtrn_cref)
-        ;
+        .def("rtrn_lref", &uconsumer::rtrn_lref)
+        .def("rtrn_cref", &uconsumer::rtrn_cref);
 
     // Helpers for testing.
     // These require selected functions above to work first, as indicated:
@@ -212,7 +211,7 @@ TEST_SUBMODULE(class_sh_basic, m) {
     m.def("get_ptr", get_ptr);   // pass_cref
 
     m.def("unique_ptr_roundtrip", unique_ptr_roundtrip); // pass_uqmp, rtrn_uqmp
-    // BAKEIN_BREAK m.def("unique_ptr_cref_roundtrip", unique_ptr_cref_roundtrip);
+    m.def("unique_ptr_cref_roundtrip", unique_ptr_cref_roundtrip);
 
     py::classh<SharedPtrStash>(m, "SharedPtrStash")
         .def(py::init<>())