Mojo C++ Bindings: Eliminate unbound ThreadSafeInterfacePtr

mojo/public/cpp/bindings/interface_ptr.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_CPP_BINDINGS_INTERFACE_PTR_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_PTR_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 22 matching lines @@
 // to a message pipe. All calls to this class or the proxy should be from the
 // same thread that bound it. If you need to move the proxy to a different
 // thread, extract the InterfacePtrInfo (containing just the message pipe and
 // any version information) using PassInterface(), pass it to a different
 // thread, and create and bind a new InterfacePtr from that thread. If an
 // InterfacePtr is not bound to a message pipe, it may be bound or destroyed on
 // any thread.
 template <typename Interface>
 class InterfacePtr {
  public:
+  using InterfaceType = Interface;
+  using PtrInfoType = InterfacePtrInfo<Interface>;
+
   // Constructs an unbound InterfacePtr.
   InterfacePtr() {}
   InterfacePtr(decltype(nullptr)) {}
 
   // Takes over the binding of another InterfacePtr.
   InterfacePtr(InterfacePtr&& other) {
     internal_state_.Swap(&other.internal_state_);
   }
 
   // Takes over the binding of another InterfacePtr, and closes any message pipe
@@ skipping 187 matching lines @@
         base::ThreadTaskRunnerHandle::Get()) {
   InterfacePtr<Interface> ptr;
   if (info.is_valid())
     ptr.Bind(std::move(info), std::move(runner));
   return std::move(ptr);
 }
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_PTR_H_