Mojo: more idiomatic C++ bindings

mojo/public/cpp/bindings/buffer.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_BUFFER_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_BUFFER_H_
-
-#include <stddef.h>
-
-namespace mojo {
-
-// Buffer provides a way to allocate memory. Allocations are 8-byte aligned and
-// zero-initialized. Allocations remain valid for the lifetime of the Buffer.
-class Buffer {
- public:
-  typedef void (*Destructor)(void* address);
-
-  Buffer();
-  virtual ~Buffer();
-
-  // A destructor may optionally be assigned to the allocation. Destructors run
-  // (in LIFO order) when the Buffer instance is destroyed.
-  virtual void* Allocate(size_t num_bytes, Destructor func = NULL) = 0;
-
-  // Returns the current Buffer from thread local storage. May be NULL.
-  static Buffer* current();
-
- private:
-  Buffer* previous_;
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_BUFFER_H_