From 9d580ea80592189e6d44fa35bcf9cdea8bf620d6 Mon Sep 17 00:00:00 2001
From: Igor Nazarenko <igor.n.nazarenko@gmail.com>
Date: Sun, 19 Apr 2020 17:30:50 -0700
Subject: Enable protobuf printing for open-source proto messages.

---
 googletest/include/gtest/internal/gtest-internal.h | 15 +++++++++++++--
 googletest/test/gtest_unittest.cc                  |  4 ++++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/googletest/include/gtest/internal/gtest-internal.h b/googletest/include/gtest/internal/gtest-internal.h
index 7f1a5b00..c36029ee 100644
--- a/googletest/include/gtest/internal/gtest-internal.h
+++ b/googletest/include/gtest/internal/gtest-internal.h
@@ -94,6 +94,12 @@ namespace proto2 {
 class MessageLite;
 }
 
+namespace google {
+namespace protobuf {
+class MessageLite;
+}
+}
+
 namespace testing {
 
 // Forward declarations.
@@ -881,10 +887,15 @@ class GTEST_API_ Random {
   typename std::remove_const<typename std::remove_reference<T>::type>::type
 
 // IsAProtocolMessage<T>::value is a compile-time bool constant that's
-// true if and only if T is type proto2::MessageLite or a subclass of it.
+// true if and only if T is type proto2::MessageLite or
+// google::protobuf::MessageLite or a subclass of one of them.
 template <typename T>
 struct IsAProtocolMessage
-    : public std::is_convertible<const T*, const ::proto2::MessageLite*> {};
+    : public std::integral_constant<
+          bool,
+          std::is_convertible<const T*, const ::proto2::MessageLite*>::value ||
+              std::is_convertible<
+                  const T*, const ::google::protobuf::MessageLite*>::value> {};
 
 // When the compiler sees expression IsContainerTest<C>(0), if C is an
 // STL-style container class, the first overload of IsContainerTest
diff --git a/googletest/test/gtest_unittest.cc b/googletest/test/gtest_unittest.cc
index 005a2d40..631180e3 100644
--- a/googletest/test/gtest_unittest.cc
+++ b/googletest/test/gtest_unittest.cc
@@ -7115,6 +7115,10 @@ TEST(IsAProtocolMessageTest, ValueIsTrueWhenTypeIsAProtocolMessage) {
   EXPECT_TRUE(IsAProtocolMessage<::proto2::MessageLite>::value);
 }
 
+TEST(IsAProtocolMessageTest, ValueIsTrueWhenTypeIsAnOpenSourceProtocolMessage) {
+  EXPECT_TRUE(IsAProtocolMessage<::google::protobuf::MessageLite>::value);
+}
+
 // Tests that IsAProtocolMessage<T>::value is false when T is neither
 // ::proto2::Message nor a sub-class of it.
 TEST(IsAProtocolMessageTest, ValueIsFalseWhenTypeIsNotAProtocolMessage) {
-- 
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