hpb: Remove DeepCopy - no extant users

PiperOrigin-RevId: 673815064

hpb/hpb.cc

@@ -106,12 +106,6 @@ absl::StatusOr<absl::string_view> Serialize(const upb_Message* message,
   return MessageEncodeError(status);
 }
 
-void DeepCopy(upb_Message* target, const upb_Message* source,
-              const upb_MiniTable* mini_table, upb_Arena* arena) {
-  MessageLock msg_lock(source);
-  upb_Message_DeepCopy(target, source, mini_table, arena);
-}
-
 upb_Message* DeepClone(const upb_Message* source,
                        const upb_MiniTable* mini_table, upb_Arena* arena) {
   MessageLock msg_lock(source);

hpb/hpb.h

@@ -83,9 +83,6 @@ bool HasExtensionOrUnknown(const upb_Message* msg,
 bool GetOrPromoteExtension(upb_Message* msg, const upb_MiniTableExtension* eid,
                            upb_Arena* arena, upb_MessageValue* value);
 
-void DeepCopy(upb_Message* target, const upb_Message* source,
-              const upb_MiniTable* mini_table, upb_Arena* arena);
-
 upb_Message* DeepClone(const upb_Message* source,
                        const upb_MiniTable* mini_table, upb_Arena* arena);
 
@@ -253,33 +250,6 @@ typename T::Proxy CloneMessage(Ptr<T> message, upb_Arena* arena) {
       arena);
 }
 
-template <typename T>
-void DeepCopy(Ptr<const T> source_message, Ptr<T> target_message) {
-  static_assert(!std::is_const_v<T>);
-  ::hpb::internal::DeepCopy(
-      hpb::interop::upb::GetMessage(target_message),
-      hpb::interop::upb::GetMessage(source_message), T::minitable(),
-      static_cast<upb_Arena*>(target_message->GetInternalArena()));
-}
-
-template <typename T>
-void DeepCopy(Ptr<const T> source_message, T* target_message) {
-  static_assert(!std::is_const_v<T>);
-  DeepCopy(source_message, Ptr(target_message));
-}
-
-template <typename T>
-void DeepCopy(const T* source_message, Ptr<T> target_message) {
-  static_assert(!std::is_const_v<T>);
-  DeepCopy(Ptr(source_message), target_message);
-}
-
-template <typename T>
-void DeepCopy(const T* source_message, T* target_message) {
-  static_assert(!std::is_const_v<T>);
-  DeepCopy(Ptr(source_message), Ptr(target_message));
-}
-
 template <typename T>
 void ClearMessage(hpb::internal::PtrOrRaw<T> message) {
   backend::ClearMessage(message);

hpb_generator/tests/test_generated.cc

@@ -1188,25 +1188,6 @@ TEST(CppGeneratedCode, CannotInvokeClearMessageWithConstRawPtr) {
   EXPECT_FALSE(CanCallClearMessage<const TestModel*>());
 }
 
-TEST(CppGeneratedCode, DeepCopy) {
-  // Fill model.
-  TestModel model;
-  model.set_int64(5);
-  model.set_str2("Hello");
-  auto new_child = model.add_child_models();
-  ASSERT_TRUE(new_child.ok());
-  new_child.value()->set_child_str1("text in child");
-  ThemeExtension extension1;
-  extension1.set_ext_name("name in extension");
-  EXPECT_TRUE(::hpb::SetExtension(&model, theme, extension1).ok());
-  TestModel target;
-  target.set_b1(true);
-  ::hpb::DeepCopy(&model, &target);
-  EXPECT_FALSE(target.b1()) << "Target was not cleared before copying content ";
-  EXPECT_EQ(target.str2(), "Hello");
-  EXPECT_TRUE(::hpb::HasExtension(&target, theme));
-}
-
 TEST(CppGeneratedCode, HasExtensionAndRegistry) {
   // Fill model.
   TestModel source;