Mojo: more idiomatic C++ bindings

mojo/public/cpp/bindings/tests/array_unittest.cc

 // Copyright 2014 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.
 
-#include "mojo/public/cpp/bindings/allocation_scope.h"
 #include "mojo/public/cpp/bindings/array.h"
 #include "mojo/public/cpp/bindings/lib/fixed_buffer.h"
 #include "mojo/public/cpp/bindings/lib/scratch_buffer.h"
 #include "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/interfaces/bindings/tests/sample_service.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace test {
 namespace {
 
 // Tests that basic Array operations work.
 TEST(ArrayTest, Basic) {
-  Environment env;
-
-  // 8 bytes for the array, with 8 bytes left over for elements.
-  internal::FixedBuffer buf(8 + 8*sizeof(char));
-  EXPECT_EQ(16u, buf.size());
-
-  Array<char>::Builder builder(8);
-  EXPECT_EQ(8u, builder.size());
-  for (size_t i = 0; i < builder.size(); ++i) {
+  Array<char> array(8);
+  for (size_t i = 0; i < array.size(); ++i) {
     char val = static_cast<char>(i*2);
-    builder[i] = val;
-    EXPECT_EQ(val, builder.at(i));
-  }
-  Array<char> array = builder.Finish();
-  for (size_t i = 0; i < array.size(); ++i) {
-    char val = static_cast<char>(i) * 2;
-    EXPECT_EQ(val, array[i]);
+    array[i] = val;
+    EXPECT_EQ(val, array.at(i));
   }
 }
 
-// Tests that basic Array<bool> operations work, and that it's packed into 1
-// bit per element.
+// Tests that basic Array<bool> operations work.
 TEST(ArrayTest, Bool) {
-  Environment env;
-
-  // 8 bytes for the array header, with 8 bytes left over for elements.
-  internal::FixedBuffer buf(8 + 3);
-  EXPECT_EQ(16u, buf.size());
-
-  // An array of 64 bools can fit into 8 bytes.
-  Array<bool>::Builder builder(64);
-  EXPECT_EQ(64u, builder.size());
-  for (size_t i = 0; i < builder.size(); ++i) {
-    bool val = i % 3 == 0;
-    builder[i] = val;
-    EXPECT_EQ(val, builder.at(i));
-  }
-  Array<bool> array = builder.Finish();
+  Array<bool> array(64);
   for (size_t i = 0; i < array.size(); ++i) {
     bool val = i % 3 == 0;
-    EXPECT_EQ(val, array[i]);
+    array[i] = val;
+    EXPECT_EQ(val, array.at(i));
   }
 }
 
-// Tests that Array<Handle> supports transferring handles.
+// Tests that Array<ScopedMessagePipeHandle> supports transferring handles.
 TEST(ArrayTest, Handle) {
-  Environment env;
-
-  AllocationScope scope;
-
   ScopedMessagePipeHandle pipe0, pipe1;
   CreateMessagePipe(&pipe0, &pipe1);
 
-  Array<MessagePipeHandle>::Builder handles_builder(2);
-  handles_builder[0] = pipe0.Pass();
-  handles_builder[1].reset(pipe1.release());
+  Array<ScopedMessagePipeHandle> handles(2);
+  handles[0] = pipe0.Pass();
+  handles[1].reset(pipe1.release());
 
   EXPECT_FALSE(pipe0.is_valid());
   EXPECT_FALSE(pipe1.is_valid());
 
-  Array<MessagePipeHandle> handles = handles_builder.Finish();
-  EXPECT_TRUE(handles[0].is_valid());
-  EXPECT_TRUE(handles[1].is_valid());
+  Array<ScopedMessagePipeHandle> handles2 = handles.Pass();
+  EXPECT_TRUE(handles2[0].is_valid());
+  EXPECT_TRUE(handles2[1].is_valid());
 
-  pipe0 = handles[0].Pass();
+  pipe0 = handles2[0].Pass();
   EXPECT_TRUE(pipe0.is_valid());
-  EXPECT_FALSE(handles[0].is_valid());
+  EXPECT_FALSE(handles2[0].is_valid());
 }
 
-// Tests that Array<Handle> supports closing handles.
+// Tests that Array<ScopedMessagePipeHandle> supports closing handles.
 TEST(ArrayTest, HandlesAreClosed) {
-  Environment env;
-
-  ScopedMessagePipeHandle msg_pipe0, msg_pipe1;
-  CreateMessagePipe(&msg_pipe0, &msg_pipe1);
-
-  ScopedHandle pipe0 = ScopedHandle::From(msg_pipe0.Pass());
-  ScopedHandle pipe1 = ScopedHandle::From(msg_pipe1.Pass());
-
-  MojoHandle pipe0_value = pipe0.get().value();
-  MojoHandle pipe1_value = pipe1.get().value();
-
-  {
-    AllocationScope scope;
-
-    Array<Handle>::Builder handles_builder(2);
-    handles_builder[0] = pipe0.Pass();
-    handles_builder[1].reset(pipe1.release());
-
-    MOJO_ALLOW_UNUSED Array<Handle> handles =
-        handles_builder.Finish();
-  }
-
-  // We expect the pipes to have been closed.
-  EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT, MojoClose(pipe0_value));
-  EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT, MojoClose(pipe1_value));
-}
-
-// Tests that Array<MessagePipeHandle> supports closing handles.
-TEST(ArrayTest, MessagePipeHandlesAreClosed) {
-  Environment env;
-
   ScopedMessagePipeHandle pipe0, pipe1;
   CreateMessagePipe(&pipe0, &pipe1);
 
   MojoHandle pipe0_value = pipe0.get().value();
   MojoHandle pipe1_value = pipe1.get().value();
 
   {
-    AllocationScope scope;
-
-    Array<MessagePipeHandle>::Builder handles_builder(2);
-    handles_builder[0] = pipe0.Pass();
-    handles_builder[1].reset(pipe1.release());
-
-    MOJO_ALLOW_UNUSED Array<MessagePipeHandle> handles =
-        handles_builder.Finish();
+    Array<ScopedMessagePipeHandle> handles(2);
+    handles[0] = pipe0.Pass();
+    handles[1].reset(pipe1.release());
   }
 
   // We expect the pipes to have been closed.
   EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT, MojoClose(pipe0_value));
   EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT, MojoClose(pipe1_value));
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo