persistent_ptr_base.hpp

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// SPDX-License-Identifier: BSD-3-Clause
/* Copyright 2016-2020, Intel Corporation */
 
#ifndef LIBPMEMOBJ_CPP_PERSISTENT_PTR_BASE_HPP
#define LIBPMEMOBJ_CPP_PERSISTENT_PTR_BASE_HPP
 
#include <cstdint>
#include <type_traits>
 
#include <libpmemobj++/detail/common.hpp>
#include <libpmemobj++/detail/specialization.hpp>
#include <libpmemobj/base.h>
 
/* Windows has a max macro which collides with std::numeric_limits::max */
#if defined(max) && defined(_WIN32)
#undef max
#endif
 
namespace pmem
{
 
namespace obj
{
 
class persistent_ptr_base {
public:
    persistent_ptr_base() noexcept : oid(OID_NULL)
    {
    }
 
    /*
     * Curly braces initialization is not used because the
     * PMEMoid is a plain C (POD) type and we can't add a default
     * constructor in there.
     */
 
    persistent_ptr_base(PMEMoid oid) noexcept : oid(oid)
    {
    }
 
    /*
     * Copy constructor.
     *
     * @param r Persistent pointer to the same type.
     */
    persistent_ptr_base(persistent_ptr_base const &r) noexcept : oid(r.oid)
    {
    }
 
    persistent_ptr_base(persistent_ptr_base &&r) noexcept
        : oid(std::move(r.oid))
    {
    }
 
    persistent_ptr_base &
    operator=(persistent_ptr_base &&r)
    {
        detail::conditional_add_to_tx(this);
        this->oid = std::move(r.oid);
 
        return *this;
    }
 
    persistent_ptr_base &
    operator=(persistent_ptr_base const &r)
    {
        detail::conditional_add_to_tx(this);
        this->oid = r.oid;
 
        return *this;
    }
 
    persistent_ptr_base &
    operator=(std::nullptr_t &&)
    {
        detail::conditional_add_to_tx(this);
        this->oid = {0, 0};
        return *this;
    }
 
    void
    swap(persistent_ptr_base &other)
    {
        detail::conditional_add_to_tx(this);
        detail::conditional_add_to_tx(&other);
        std::swap(this->oid, other.oid);
    }
 
    const PMEMoid &
    raw() const noexcept
    {
        return this->oid;
    }
 
    PMEMoid *
    raw_ptr() noexcept
    {
        return &(this->oid);
    }
 
protected:
    /* The underlying PMEMoid of the held object. */
    PMEMoid oid;
};
 
} /* namespace obj */
 
} /* namespace pmem */
 
#endif /* LIBPMEMOBJ_CPP_PERSISTENT_PTR_BASE_HPP */