Draft: apps APIs in Pepper

ppapi/cpp/dev/optional_dev.h

Index: ppapi/cpp/dev/optional_dev.h
diff --git a/ppapi/cpp/dev/optional_dev.h b/ppapi/cpp/dev/optional_dev.h
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index 0000000000000000000000000000000000000000..9144ff96e792609daba6d95c7754b254a22ec6c7
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+++ b/ppapi/cpp/dev/optional_dev.h
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+// 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_OPTIONAL_DEV_H_
+#define PPAPI_CPP_DEV_OPTIONAL_DEV_H_
+
+#include "ppapi/c/dev/pp_optional_structs_dev.h"
+#include "ppapi/cpp/dev/array_dev.h"
+#include "ppapi/cpp/dev/may_own_ptr_dev.h"
+#include "ppapi/cpp/dev/string_wrapper_dev.h"
+#include "ppapi/cpp/logging.h"
+#include "ppapi/cpp/var.h"
+
+namespace pp {
+
+template <class T>
+class Optional;
+
+template <>
+class Optional<double> {
+ public:
+  typedef const PP_Optional_Double* CType;
+
+  Optional(PP_Optional_Double* storage, NotOwned) :
+      storage_(storage, NOT_OWNED) {
+  }
+
+  Optional(const Optional<double>& other) : storage_(other.storage_) {
+  }
+
+  Optional<double>& operator=(const Optional<double>& other) {
+    storage_ = other.storage_;
+    return *this;
+  }
+
+  Optional<double>& operator=(const PP_Optional_Double& other) {
+    *storage_ = other;
+    return *this;
+  }
+
+  bool is_set() const { return PP_ToBool(storage_->is_set); }
+  void unset() { storage_->is_set = PP_FALSE; }
+  double get() const { return storage_->value; }
+  void set(double value) { storage_->value = value; }
+
+  PP_Optional_Double* StartRawUpdate() { return storage_.get(); }
+  void EndRawUpdate() {}
+
+  const PP_Optional_Double* ToCType() const {
+    return storage_.get();
+  }
+
+ private:
+  internal::MayOwnPtr<PP_Optional_Double> storage_;
+};
+
+template <>
+class Optional<Array<double> > {
+ public:
+  typedef const PP_Optional_Double_Array* CType;
+
+  Optional(PP_Optional_Double_Array* storage, NotOwned) :
+      storage_(storage, NOT_OWNED),
+      wrapper_(&storage_->value, NOT_OWNED) {
+  }
+
+  Optional(const Optional<Array<double> >& other)
+      : wrapper_(&storage_->value, NOT_OWNED) {
+    wrapper_ = other.wrapper_;
+  }
+
+  Optional<Array<double> >& operator=(const Optional<Array<double> >& other) {
+    return operator=(*other.storage_);
+  }
+
+  Optional<Array<double> >& operator=(const PP_Optional_Double_Array& other) {
+    if (storage_.get() == &other)
+      return *this;
+
+    storage_->is_set = other.is_set;
+    if (storage_->is_set)
+      wrapper_ = other.value;
+    else
+      wrapper_.Reset(0);
+
+    return *this;
+  }
+
+  bool is_set() const { return PP_ToBool(storage_->is_set); }
+  void unset() {
+    storage_->is_set = PP_FALSE;
+    wrapper_.Reset(0);
+  }
+  const Array<double>& get() const { return wrapper_; }
+  Array<double>& get() { return wrapper_; }
+
+  PP_Optional_Double_Array* StartRawUpdate() {
+    wrapper_.StartRawUpdate();
+    return storage_.get();
+  }
+
+  void EndRawUpdate() {
+    wrapper_.EndRawUpdate();
+  }
+
+  const PP_Optional_Double_Array* ToCType() const {
+    return storage_.get();
+  }
+
+ private:
+  internal::MayOwnPtr<PP_Optional_Double_Array> storage_;
+  Array<double> wrapper_;
+};
+
+template <>
+class Optional<std::string> {
+ public:
+  typedef const PP_Var& CType;
+
+  Optional(PP_Var* storage, NotOwned)
+      : storage_(storage, NOT_OWNED),
+        wrapper_(storage_.get(), NOT_OWNED) {
+  }
+
+  Optional(const Optional<std::string>& other)
+      : wrapper_(storage_.get(), NOT_OWNED) {
+    wrapper_ = other.wrapper_;
+  }
+
+  Optional<std::string>& operator=(const Optional<std::string>& other) {
+    return operator=(*other.storage_);
+  }
+
+  Optional(const std::string& value)
+      : wrapper_(storage_.get(), NOT_OWNED) {
+    wrapper_.set(value);
+  }
+
+  Optional<std::string>& operator=(const PP_Var& other) {
+    if (storage_.get() == &other)
+      return *this;
+
+    wrapper_ = other;
+    return *this;
+  }
+
+  bool is_set() const { return wrapper_.is_set(); }
+  void unset() { wrapper_.unset(); }
+  std::string get() const { return wrapper_.get(); }
+  void set(const std::string& value) { wrapper_.set(value); }
+
+  PP_Var* StartRawUpdate() {
+    wrapper_.StartRawUpdate();
+    return storage_.get();
+  }
+
+  void EndRawUpdate() {
+    wrapper_.EndRawUpdate();
+  }
+
+  const PP_Var& ToCType() const {
+    return *storage_;
+  }
+
+ private:
+  internal::MayOwnPtr<PP_Var> storage_;
+  internal::StringWrapper wrapper_;
+};
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_DEV_OPTIONAL_DEV_H_