46 lines
817 B
C++
46 lines
817 B
C++
/*
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the LICENSE
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* file in the root directory of this source tree.
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*
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*/
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#pragma once
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#include <atomic>
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#include <fb/assert.h>
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#include <fb/noncopyable.h>
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#include <fb/nonmovable.h>
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#include <fb/RefPtr.h>
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namespace facebook {
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class Countable : public noncopyable, public nonmovable {
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public:
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// RefPtr expects refcount to start at 0
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Countable() : m_refcount(0) {}
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virtual ~Countable()
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{
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FBASSERT(m_refcount == 0);
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}
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private:
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void ref() {
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++m_refcount;
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}
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void unref() {
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if (0 == --m_refcount) {
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delete this;
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}
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}
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bool hasOnlyOneRef() const {
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return m_refcount == 1;
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}
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template <typename T> friend class RefPtr;
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std::atomic<int> m_refcount;
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};
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}
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