Mojo C++ bindings: associated interface pointers/requests validation

mojo/public/cpp/bindings/lib/bindings_internal.h

 // Copyright 2013 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_LIB_BINDINGS_INTERNAL_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_INTERNAL_H_
 
 #include "mojo/public/cpp/bindings/lib/interface_id.h"
 #include "mojo/public/cpp/bindings/lib/template_util.h"
 #include "mojo/public/cpp/bindings/struct_ptr.h"
@@ skipping 26 matching lines @@
 };
 static_assert(sizeof(StructPointer<char>) == 8, "Bad_sizeof(StructPointer)");
 
 template <typename T>
 union ArrayPointer {
   uint64_t offset;
   Array_Data<T>* ptr;
 };
 static_assert(sizeof(ArrayPointer<char>) == 8, "Bad_sizeof(ArrayPointer)");
 
-union StringPointer {
-  uint64_t offset;
-  Array_Data<char>* ptr;
-};
+using StringPointer = ArrayPointer<char>;
 static_assert(sizeof(StringPointer) == 8, "Bad_sizeof(StringPointer)");
 
 
 template <typename T>
 union UnionPointer {
   uint64_t offset;
   T* ptr;
 };
 static_assert(sizeof(UnionPointer<char>) == 8, "Bad_sizeof(UnionPointer)");
 
@@ skipping 65 matching lines @@
 };
 template <typename S>
 struct WrapperTraits<S, true> {
   typedef typename S::Data_* DataType;
 };
 
 }  // namespace internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_INTERNAL_H_