Draft: apps APIs in Pepper

ppapi/cpp/dev/string_wrapper_dev.h

+// Copyright (c) 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 PPAPI_CPP_DEV_STRING_WRAPPER_DEV_H_
+#define PPAPI_CPP_DEV_STRING_WRAPPER_DEV_H_
+
+#include <string>
+
+#include "ppapi/c/pp_var.h"
+#include "ppapi/cpp/dev/may_own_ptr_dev.h"
+
+namespace pp {
+namespace internal {
+
+class StringWrapper {
+ public:
+  StringWrapper(PP_Var* storage, NotOwned);
+  explicit StringWrapper(const std::string& value);
+  StringWrapper(const StringWrapper& other);
+
+  ~StringWrapper();
+
+  StringWrapper& operator=(const StringWrapper& other);
+  StringWrapper& operator=(const PP_Var& other);
+
+  bool is_set() const;
+  void unset();
+  // TODO(yzshen): it should be easy to add a cache.
+  std::string get() const;
+  void set(const std::string& value);
+
+  const PP_Var& ToVar() const {
+    return *storage_;
+  }
+
+  PP_Var* StartRawUpdate() { return storage_.get(); }
+  void EndRawUpdate() {}
+
+ private:
+  MayOwnPtr<PP_Var> storage_;
+};
+
+}  // namespace internal
+}  // namespace pp
+
+#endif  // PPAPI_CPP_DEV_STRING_WRAPPER_DEV_H_