For c++, Generate enum classes instead of enum from mojom.

examples/echo_terminal/main.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.
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "mojo/application/application_runner_chromium.h"
 #include "mojo/common/binding_set.h"
@@ skipping 11 matching lines @@
 class TerminalEchoer {
  public:
   explicit TerminalEchoer(mojo::files::FilePtr terminal)
       : terminal_(terminal.Pass()), last_bytes_read_size_(0) {
     terminal_.set_connection_error_handler([this]() { OnConnectionError(); });
   }
 
   void StartReading() {
     // TODO(vtl): Are |offset| and |whence| correct?
     terminal_->Read(
-        kMaxBytesToRead, 0, mojo::files::WHENCE_FROM_CURRENT,
+        kMaxBytesToRead, 0, mojo::files::Whence::FROM_CURRENT,
         base::Bind(&TerminalEchoer::OnRead, base::Unretained(this)));
   }
 
  private:
   ~TerminalEchoer() {}
 
   // Error callback:
   void OnConnectionError() { delete this; }
 
   // |Read()| callback:
   void OnRead(mojo::files::Error error, mojo::Array<uint8_t> bytes_read) {
-    if (error != mojo::files::ERROR_OK) {
+    if (error != mojo::files::Error::OK) {
       LOG(ERROR) << "Error: Read(): " << error;
       delete this;
       return;
     }
 
     if (!bytes_read) {
       LOG(ERROR) << "Error: no bytes read (null)";
       delete this;
       return;
     }
 
     if (bytes_read.size() == 0 || bytes_read.size() > kMaxBytesToRead) {
       LOG(ERROR) << "Error: invalid amount of bytes read: " << bytes_read.size()
                  << " bytes";
       delete this;
       return;
     }
 
     // Save this, so that we can check in |OnWrite()|.
     last_bytes_read_size_ = bytes_read.size();
 
     // TODO(vtl): Are |offset| and |whence| correct?
     terminal_->Write(
-        bytes_read.Pass(), 0, mojo::files::WHENCE_FROM_CURRENT,
+        bytes_read.Pass(), 0, mojo::files::Whence::FROM_CURRENT,
         base::Bind(&TerminalEchoer::OnWrite, base::Unretained(this)));
   }
 
   // |Write()| callback:
   void OnWrite(mojo::files::Error error, uint32_t num_bytes_written) {
-    if (error != mojo::files::ERROR_OK) {
+    if (error != mojo::files::Error::OK) {
       LOG(ERROR) << "Error: Write(): " << error;
       delete this;
       return;
     }
 
     if (num_bytes_written != last_bytes_read_size_) {
       LOG(ERROR) << "Error: failed to write all bytes (last read: "
                  << last_bytes_read_size_
                  << " bytes; wrote: " << num_bytes_written << " bytes)";
       delete this;
@@ skipping 41 matching lines @@
 
   mojo::BindingSet<mojo::terminal::TerminalClient> terminal_clients_;
 
   DISALLOW_COPY_AND_ASSIGN(EchoTerminalApp);
 };
 
 MojoResult MojoMain(MojoHandle application_request) {
   mojo::ApplicationRunnerChromium runner(new EchoTerminalApp());
   return runner.Run(application_request);
 }