From a9fea36cb3c4ce28e2a1f217d3d098a0152c8bb6 Mon Sep 17 00:00:00 2001
From: MediaPipe Team <mediapipe-team@google.com>
Date: Wed, 12 Oct 2022 11:41:28 -0700
Subject: [PATCH] Put Destination::base_ into private section. (Cleanup.)

PiperOrigin-RevId: 480678168
---
 mediapipe/framework/api2/builder.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/mediapipe/framework/api2/builder.h b/mediapipe/framework/api2/builder.h
index 11bcd21c..111451ce 100644
--- a/mediapipe/framework/api2/builder.h
+++ b/mediapipe/framework/api2/builder.h
@@ -120,6 +120,9 @@ using AllowCast = std::integral_constant<bool, std::is_same_v<T, AnyType> &&
 
 }  // namespace internal_builder
 
+template <bool IsSide, typename T = internal::Generic>
+class SourceImpl;
+
 // These classes wrap references to the underlying source/destination
 // endpoints, adding type information and the user-visible API.
 template <bool IsSide, typename T = internal::Generic>
@@ -137,10 +140,14 @@ class DestinationImpl {
     return DestinationImpl<IsSide, U>(&base_);
   }
 
+ private:
   DestinationBase& base_;
+
+  template <bool Source_IsSide, typename Source_T>
+  friend class SourceImpl;
 };
 
-template <bool IsSide, typename T = internal::Generic>
+template <bool IsSide, typename T>
 class SourceImpl {
  public:
   using Base = SourceBase;