p.hpp

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/*
 * Copyright 2015-2018, Intel Corporation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
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 *       notice, this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
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 *       distribution.
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 *       contributors may be used to endorse or promote products derived
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 */

#ifndef LIBPMEMOBJ_CPP_P_HPP
#define LIBPMEMOBJ_CPP_P_HPP

#include <memory>

#include <libpmemobj++/detail/common.hpp>
#include <libpmemobj++/detail/specialization.hpp>

namespace pmem
{

namespace obj
{
template <typename T>
class p {
    typedef p<T> this_type;

public:
    p(const T &_val) noexcept : val{_val}
    {
    }

    p() = default;

    p &
    operator=(const p &rhs)
    {
        this_type(rhs).swap(*this);

        return *this;
    }

    template <typename Y,
          typename = typename std::enable_if<
              std::is_convertible<Y, T>::value>::type>
    p &
    operator=(const p<Y> &rhs)
    {
        this_type(rhs).swap(*this);

        return *this;
    }

    operator T() const noexcept
    {
        return this->val;
    }

    T &
    get_rw()
    {
        detail::conditional_add_to_tx(this);

        return this->val;
    }

    const T &
    get_ro() const noexcept
    {
        return this->val;
    }

    void
    swap(p &other)
    {
        detail::conditional_add_to_tx(this);
        detail::conditional_add_to_tx(&other);
        std::swap(this->val, other.val);
    }

private:
    T val;
};

template <class T>
inline void
swap(p<T> &a, p<T> &b)
{
    a.swap(b);
}

} /* namespace obj */

} /* namespace pmem */

#endif /* LIBPMEMOBJ_CPP_P_HPP */