lean2/src/util/rc.h

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/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#pragma once
// Goodies for reference counting
#include "util/thread.h"
#include "util/debug.h"
#define MK_LEAN_RC() \
private: \
atomic<unsigned> m_rc; \
public: \
unsigned get_rc() const { return atomic_load(&m_rc); } \
void inc_ref() { atomic_fetch_add_explicit(&m_rc, 1u, memory_order_relaxed); } \
bool dec_ref_core() { lean_assert(get_rc() > 0); return atomic_fetch_sub_explicit(&m_rc, 1u, memory_order_relaxed) == 1u; } \
void dec_ref() { if (dec_ref_core()) dealloc(); }
#define LEAN_COPY_REF(Arg) \
if (Arg.m_ptr) \
Arg.m_ptr->inc_ref(); \
auto new_ptr = Arg.m_ptr; \
if (m_ptr) \
m_ptr->dec_ref(); \
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m_ptr = new_ptr; \
return *this;
#define LEAN_MOVE_REF(Arg) \
if (m_ptr) \
m_ptr->dec_ref(); \
m_ptr = Arg.m_ptr; \
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Arg.m_ptr = nullptr; \
return *this;