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dart_persistent_value.h
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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 
13 namespace tonic {
14 class 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.
21  public:
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_
Dart_PersistentHandle value() const
void Set(DartState *dart_state, Dart_Handle value)
const std::weak_ptr< DartState > & dart_state() const