From 7aad1b79fee15c3f0277484ffa9ac37e134a4b71 Mon Sep 17 00:00:00 2001
From: "Ralf W. Grosse-Kunstleve" <rwgk@google.com>
Date: Fri, 2 Aug 2024 09:07:30 -0700
Subject: [PATCH] native_proto_caster.h: Add
 `*_with_smart_holder_support_enabled` specializations.

The

* `copyable_holder_caster_shared_ptr_with_smart_holder_support_enabled` and

* `move_only_holder_caster_unique_ptr_with_smart_holder_support_enabled`

SFINAE helpers were introduced with https://github.com/pybind/pybind11/pull/5257. They need to be specialized here (`std::false_type`) because native_proto_caster.h has its own specializations for

* `copyable_holder_caster<ProtoType, std::shared_ptr<ProtoType>>` and

* `move_only_holder_caster<ProtoType, std::unique_ptr<ProtoType>>`.

PiperOrigin-RevId: 658807442
---
 pybind11_protobuf/native_proto_caster.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/pybind11_protobuf/native_proto_caster.h b/pybind11_protobuf/native_proto_caster.h
index dfdce39..cf87a83 100644
--- a/pybind11_protobuf/native_proto_caster.h
+++ b/pybind11_protobuf/native_proto_caster.h
@@ -91,6 +91,20 @@ struct type_caster<
     : public pybind11_protobuf::proto_caster<
           ProtoType, pybind11_protobuf::native_cast_impl> {};
 
+#if defined(PYBIND11_HAVE_INTERNALS_WITH_SMART_HOLDER_SUPPORT)
+
+template <typename ProtoType>
+struct copyable_holder_caster_shared_ptr_with_smart_holder_support_enabled<
+    ProtoType, enable_if_t<std::is_base_of<::google::protobuf::Message, ProtoType>::value>>
+    : std::false_type {};
+
+template <typename ProtoType>
+struct move_only_holder_caster_unique_ptr_with_smart_holder_support_enabled<
+    ProtoType, enable_if_t<std::is_base_of<::google::protobuf::Message, ProtoType>::value>>
+    : std::false_type {};
+
+#endif  // PYBIND11_HAVE_INTERNALS_WITH_SMART_HOLDER_SUPPORT
+
 // NOTE: If smart_holders becomes the default we will need to change this to
 //    type_caster<std::unique_ptr<ProtoType, D>, ...
 // Until then using that form is ambiguous due to the existing specialization