Add an even simpler standalone example.

examples/hello_mojo/hello_mojo_server.cc

+// Copyright 2016 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 <memory>
+#include <string>
+#include <utility>
+
+#include "examples/hello_mojo/hello_mojo.mojom.h"
+#include "mojo/public/c/system/main.h"
+#include "mojo/public/cpp/application/application_connection.h"
+#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_runner.h"
+#include "mojo/public/cpp/application/interface_factory.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "mojo/public/cpp/system/macros.h"
+
+using examples::HelloMojo;
+
+namespace {
+
+class HelloMojoImpl : public HelloMojo {
+ public:
+  explicit HelloMojoImpl(mojo::InterfaceRequest<HelloMojo> hello_mojo_request)
+      : strong_binding_(this, std::move(hello_mojo_request)) {}
+  ~HelloMojoImpl() override {}
+
+  // |examples::HelloMojo| implementation:
+  void Say(const mojo::String& request,
+           const mojo::Callback<void(mojo::String)>& callback) override {
+    callback.Run((request.get() == "hello") ? "mojo" : "WAT");
+  }
+
+ private:
+  mojo::StrongBinding<HelloMojo> strong_binding_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(HelloMojoImpl);
+};
+
+class HelloMojoServerApp : public mojo::ApplicationDelegate,
+                           public mojo::InterfaceFactory<HelloMojo> {
+ public:
+  HelloMojoServerApp() {}
+  ~HelloMojoServerApp() override {}
+
+  // |mojo::ApplicationDelegate| implementation:
+  bool ConfigureIncomingConnection(
+      mojo::ApplicationConnection* application_connection) override {
+    application_connection->AddService<HelloMojo>(this);
+    return true;
+  }
+
+  // |mojo::InterfaceFactory<HelloMojo>| implementation:
+  void Create(mojo::ApplicationConnection* application_connection,
+              mojo::InterfaceRequest<HelloMojo> hello_mojo_request) override {
+    new HelloMojoImpl(std::move(hello_mojo_request));  // Owns itself.
+  }
+
+ private:
+  MOJO_DISALLOW_COPY_AND_ASSIGN(HelloMojoServerApp);
+};
+
+}  // namespace
+
+MojoResult MojoMain(MojoHandle application_request) {
+  return mojo::ApplicationRunner(std::unique_ptr<mojo::ApplicationDelegate>(
+                                     new HelloMojoServerApp()))
+      .Run(application_request);
+}