Mojo: Use InterfaceFactory<Interface> for service registration

mojo/public/cpp/application/interface_provider.h

+// 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.
+
+#ifndef MOJO_PUBLIC_APPLICATION_INTERFACE_FACTORY_H_
+#define MOJO_PUBLIC_APPLICATION_INTERFACE_FACTORY_H_
+
+#include "mojo/public/cpp/bindings/interface_impl.h"
+#include "mojo/public/cpp/system/macros.h"
+
+namespace mojo {
+
+class ApplicationConnection;
+template <typename Interface>
+class InterfaceRequest;
+
+// Implement this class to provide implementations of a given interface and
+// bind them to incoming requests. The implementation of this class is
+// responsible for managing the lifetime of the implementations of the
+// interface.
+template <typename Interface>
+class InterfaceProvider {
+ public:
+  virtual ~InterfaceProvider() {}
+  virtual void BindToRequest(ApplicationConnection* connection,
+                             InterfaceRequest<Interface> request) = 0;
+};
+
+// Use this class to allocate and bind default-constructed instances of Impl in
+// response to requests for interface Interface.

[DaveMoore, 2014/07/15 00:08:29]

Can't you merge these two with a third template argument, and pick it up
automatically if passed to the constructor?

+template <typename Impl, typename Interface>
+class DefaultInterfaceProvider : public InterfaceProvider<Interface> {
+ public:
+  DefaultInterfaceProvider() {}
+  virtual ~DefaultInterfaceProvider() {}
+  virtual void BindToRequest(ApplicationConnection* connection,
+                             InterfaceRequest<Interface> request)
+      MOJO_OVERRIDE {
+    mojo::BindToRequest(new Impl, &request);
+  }
+};
+
+// Use this class to allocate and bind instances of Impl constructed with a
+// context parameter response to requests for interface Interface.
+template <typename Impl, typename Context, typename Interface>
+class ContextInterfaceProvider : public InterfaceProvider<Interface> {
+ public:
+  explicit ContextInterfaceProvider(Context* context) : context_(context) {}
+  virtual ~ContextInterfaceProvider() {}
+
+  virtual void BindToRequest(ApplicationConnection* connection,
+                             InterfaceRequest<Interface> request)
+      MOJO_OVERRIDE {
+    mojo::BindToRequest(new Impl(context_), &request);
+  }
+
+ private:
+  Context* context_;
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_APPLICATION_INTERFACE_FACTORY_H_