"typedef Foo Bar" -> "using Bar = Foo" in //mojo/edk/....

mojo/edk/system/data_pipe_impl_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file contains tests that are shared between different implementations of
 // |DataPipeImpl|.
 
 #include "mojo/edk/system/data_pipe_impl.h"
 
 #include <stdint.h>
@@ skipping 531 matching lines @@
     consumer_dispatcher_ =
         static_cast<DataPipeConsumerDispatcher*>(to_receive.get());
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RemoteConsumerDataPipeImplTestHelper2);
 };
 
 // Test case instantiation -----------------------------------------------------
 
-typedef testing::Types<LocalDataPipeImplTestHelper,
-                       RemoteProducerDataPipeImplTestHelper,
-                       RemoteConsumerDataPipeImplTestHelper,
-                       RemoteProducerDataPipeImplTestHelper2,
-                       RemoteConsumerDataPipeImplTestHelper2> HelperTypes;
+using HelperTypes = testing::Types<LocalDataPipeImplTestHelper,

[jamesr, 2015/05/22 18:16:04]

woah, do i wanna look at what this is?

[viettrungluu, 2015/05/22 18:24:27]

The short answer is no. The long answer is type-parametrized tests. (Fun!)

+                                   RemoteProducerDataPipeImplTestHelper,
+                                   RemoteConsumerDataPipeImplTestHelper,
+                                   RemoteProducerDataPipeImplTestHelper2,
+                                   RemoteConsumerDataPipeImplTestHelper2>;
 
 TYPED_TEST_CASE(DataPipeImplTest, HelperTypes);
 
 // Tests -----------------------------------------------------------------------
 
 // Tests creation (and possibly also transferring) of data pipes with various
 // (valid) options.
 TYPED_TEST(DataPipeImplTest, CreateAndMaybeTransfer) {
   MojoCreateDataPipeOptions test_options[] = {
       // Default options -- we'll initialize this below.
@@ skipping 1823 matching lines @@
             this->ConsumerQueryData(MakeUserPointer(&num_bytes)));
   EXPECT_EQ(1u * sizeof(int32_t), num_bytes);
 
   this->ProducerClose();
   this->ConsumerClose();
 }
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo