cpp_move_unittest.cc

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#include <google/protobuf/stubs/common.h>
#include <google/protobuf/test_util.h>
#include <google/protobuf/unittest.pb.h>
#include <gtest/gtest.h>
 
#if LANG_CXX11
#include <type_traits>
#endif
 
namespace google {
namespace protobuf {
namespace compiler {
namespace cpp {
 
// Can't use an anonymous namespace here due to brokenness of Tru64 compiler.
namespace cpp_unittest {
 
// Moves are enabled only when compiling with a C++11 compiler or newer.
#if LANG_CXX11
 
TEST(MovableMessageTest, MoveConstructor) {
  protobuf_unittest::TestAllTypes message1;
  TestUtil::SetAllFields(&message1);
  const auto* nested = &message1.optional_nested_message();
 
  protobuf_unittest::TestAllTypes message2(std::move(message1));
  TestUtil::ExpectAllFieldsSet(message2);
 
  // Check if the optional_nested_message was actually moved (and not just
  // copied).
  EXPECT_EQ(nested, &message2.optional_nested_message());
  EXPECT_NE(nested, &message1.optional_nested_message());
}
 
TEST(MovableMessageTest, MoveAssignmentOperator) {
  protobuf_unittest::TestAllTypes message1;
  TestUtil::SetAllFields(&message1);
  const auto* nested = &message1.optional_nested_message();
 
  protobuf_unittest::TestAllTypes message2;
  message2 = std::move(message1);
  TestUtil::ExpectAllFieldsSet(message2);
 
  // Check if the optional_nested_message was actually moved (and not just
  // copied).
  EXPECT_EQ(nested, &message2.optional_nested_message());
  EXPECT_NE(nested, &message1.optional_nested_message());
}
 
TEST(MovableMessageTest, SelfMoveAssignment) {
  // The `self` reference is necessary to defeat -Wself-move.
  protobuf_unittest::TestAllTypes message, &self = message;
  TestUtil::SetAllFields(&message);
  message = std::move(self);
  TestUtil::ExpectAllFieldsSet(message);
}
 
TEST(MovableMessageTest, MoveSameArena) {
  Arena arena;
 
  auto* message1_on_arena =
      Arena::CreateMessage<protobuf_unittest::TestAllTypes>(&arena);
  TestUtil::SetAllFields(message1_on_arena);
  const auto* nested = &message1_on_arena->optional_nested_message();
 
  auto* message2_on_arena =
      Arena::CreateMessage<protobuf_unittest::TestAllTypes>(&arena);
 
  // Moving messages on the same arena should lead to swapped pointers.
  *message2_on_arena = std::move(*message1_on_arena);
  EXPECT_EQ(nested, &message2_on_arena->optional_nested_message());
}
 
TEST(MovableMessageTest, MoveDifferentArenas) {
  Arena arena1, arena2;
 
  auto* message1_on_arena =
      Arena::CreateMessage<protobuf_unittest::TestAllTypes>(&arena1);
  TestUtil::SetAllFields(message1_on_arena);
  const auto* nested = &message1_on_arena->optional_nested_message();
 
  auto* message2_on_arena =
      Arena::CreateMessage<protobuf_unittest::TestAllTypes>(&arena2);
 
  // Moving messages on two different arenas should lead to a copy.
  *message2_on_arena = std::move(*message1_on_arena);
  EXPECT_NE(nested, &message2_on_arena->optional_nested_message());
  TestUtil::ExpectAllFieldsSet(*message1_on_arena);
  TestUtil::ExpectAllFieldsSet(*message2_on_arena);
}
 
TEST(MovableMessageTest, MoveFromArena) {
  Arena arena;
 
  auto* message1_on_arena =
      Arena::CreateMessage<protobuf_unittest::TestAllTypes>(&arena);
  TestUtil::SetAllFields(message1_on_arena);
  const auto* nested = &message1_on_arena->optional_nested_message();
 
  protobuf_unittest::TestAllTypes message2;
 
  // Moving from a message on the arena should lead to a copy.
  message2 = std::move(*message1_on_arena);
  EXPECT_NE(nested, &message2.optional_nested_message());
  TestUtil::ExpectAllFieldsSet(*message1_on_arena);
  TestUtil::ExpectAllFieldsSet(message2);
}
 
TEST(MovableMessageTest, MoveToArena) {
  Arena arena;
 
  protobuf_unittest::TestAllTypes message1;
  TestUtil::SetAllFields(&message1);
  const auto* nested = &message1.optional_nested_message();
 
  auto* message2_on_arena =
      Arena::CreateMessage<protobuf_unittest::TestAllTypes>(&arena);
 
  // Moving to a message on the arena should lead to a copy.
  *message2_on_arena = std::move(message1);
  EXPECT_NE(nested, &message2_on_arena->optional_nested_message());
  TestUtil::ExpectAllFieldsSet(message1);
  TestUtil::ExpectAllFieldsSet(*message2_on_arena);
}
 
TEST(MovableMessageTest, Noexcept) {
  EXPECT_TRUE(
      std::is_nothrow_move_constructible<protobuf_unittest::TestAllTypes>());
  EXPECT_TRUE(std::is_nothrow_move_assignable<protobuf_unittest::TestAllTypes>());
}
 
#endif  // LANG_CXX11
 
}  // namespace cpp_unittest
 
}  // namespace cpp
}  // namespace compiler
}  // namespace protobuf
}  // namespace google