1 files changed, 8 insertions, 0 deletions
diff --git a/include/grpc++/credentials.h b/include/grpc++/credentials.h
index b462b450da..26e9b556fe 100644
--- a/include/grpc++/credentials.h
+++ b/include/grpc++/credentials.h
@@ -42,11 +42,19 @@
 namespace grpc {
 class ChannelArguments;
 class ChannelInterface;
+class SecureCredentials;
 
 class Credentials {
  public:
   virtual ~Credentials();
 
+ protected:
+  friend std::unique_ptr<Credentials> ComposeCredentials(
+    const std::unique_ptr<Credentials>& creds1,
+    const std::unique_ptr<Credentials>& creds2);
+
+  virtual SecureCredentials* AsSecureCredentials() = 0;
+
  private:
   friend std::shared_ptr<ChannelInterface> CreateChannel(
       const grpc::string& target, const std::unique_ptr<Credentials>& creds,