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49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef LIB_TONIC_DART_WEAK_PERSISTENT_VALUE_H_
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#define LIB_TONIC_DART_WEAK_PERSISTENT_VALUE_H_
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#include <memory>
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#include "third_party/dart/runtime/include/dart_api.h"
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#include "tonic/common/macros.h"
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namespace tonic {
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class DartState;
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// DartWeakPersistentValue is a bookkeeping class to help pair calls to
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// Dart_NewWeakPersistentHandle with Dart_DeleteWeakPersistentHandle even in
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// the case if IsolateGroup shutdown. Consider using this class instead of
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// holding a Dart_PersistentHandle directly so that you don't leak the
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// Dart_WeakPersistentHandle.
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class DartWeakPersistentValue {
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public:
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DartWeakPersistentValue();
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~DartWeakPersistentValue();
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Dart_WeakPersistentHandle value() const { return handle_; }
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bool is_empty() const { return handle_ == nullptr; }
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void Set(DartState* dart_state,
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Dart_Handle object,
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void* peer,
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intptr_t external_allocation_size,
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Dart_HandleFinalizer callback);
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void Clear();
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Dart_Handle Get();
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const std::weak_ptr<DartState>& dart_state() const { return dart_state_; }
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private:
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std::weak_ptr<DartState> dart_state_;
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Dart_WeakPersistentHandle handle_;
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TONIC_DISALLOW_COPY_AND_ASSIGN(DartWeakPersistentValue);
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};
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} // namespace tonic
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#endif // LIB_TONIC_DART_WEAK_PERSISTENT_VALUE_H_
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