Mojo C++ bindings: provide data view for all object types.

mojo/public/cpp/bindings/native_struct_data_view.h

+// 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.
+
+#ifndef MOJO_PUBLIC_CPP_BINDINGS_NATIVE_STRUCT_DATA_VIEW_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_NATIVE_STRUCT_DATA_VIEW_H_
+
+#include "mojo/public/cpp/bindings/lib/native_struct_data.h"
+#include "mojo/public/cpp/bindings/lib/serialization_context.h"
+
+namespace mojo {
+
+class NativeStructDataView {
+ public:
+  using Data_ = internal::NativeStruct_Data;
+
+  NativeStructDataView() {}
+
+  NativeStructDataView(Data_* data, internal::SerializationContext* context)
+      : data_(data) {}
+
+  bool is_null() const { return !data_; }
+
+  size_t size() const { return data_->data.size(); }
+
+  uint8_t operator[](size_t index) const { return data_->data.at(index); }
+
+  const uint8_t* data() const { return data_->data.storage(); }
+
+ private:
+  Data_* data_ = nullptr;
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_NATIVE_STRUCT_DATA_VIEW_H_