1// Copyright 2013 The Flutter Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef LIB_TONIC_DART_PERSISTENT_VALUE_H_
6#define LIB_TONIC_DART_PERSISTENT_VALUE_H_
7
8#include <memory>
9
10#include "third_party/dart/runtime/include/dart_api.h"
11#include "tonic/common/macros.h"
12
13namespace tonic {
14class DartState;
15
16// DartPersistentValue is a bookkeeping class to help pair calls to
17// Dart_NewPersistentHandle with Dart_DeletePersistentHandle. Consider using
18// this class instead of holding a Dart_PersistentHandle directly so that you
19// don't leak the Dart_PersistentHandle.
20class DartPersistentValue {
21 public:
22 DartPersistentValue();
23 DartPersistentValue(DartPersistentValue&& other);
24 DartPersistentValue(DartState* dart_state, Dart_Handle value);
25 ~DartPersistentValue();
26
27 Dart_PersistentHandle value() const { return value_; }
28 bool is_empty() const { return !value_; }
29
30 void Set(DartState* dart_state, Dart_Handle value);
31 void Clear();
32 Dart_Handle Get();
33 Dart_Handle Release();
34
35 const std::weak_ptr<DartState>& dart_state() const { return dart_state_; }
36
37 private:
38 std::weak_ptr<DartState> dart_state_;
39 Dart_PersistentHandle value_;
40
41 TONIC_DISALLOW_COPY_AND_ASSIGN(DartPersistentValue);
42};
43
44} // namespace tonic
45
46#endif // LIB_TONIC_DART_PERSISTENT_VALUE_H_
47