base_disposable.hpp

//                  ReactivePlusPlus library
//
//          Copyright Aleksey Loginov 2023 - present.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//          https://www.boost.org/LICENSE_1_0.txt)
//
// Project home: https://github.com/AlexInLog/ReactivePlusPlus
//
 
#pragma once
 
#include <rpp/disposables/fwd.hpp>
 
#include <rpp/disposables/interface_disposable.hpp>
 
#include <atomic>
 
namespace rpp::details
{
    template<typename BaseInterface>
    class base_disposable_impl : public BaseInterface
    {
    public:
        base_disposable_impl()                                = default;
        base_disposable_impl(const base_disposable_impl&)     = delete;
        base_disposable_impl(base_disposable_impl&&) noexcept = delete;
 
        bool is_disposed() const noexcept final
        {
            // just need atomicity, not guarding anything
            return m_disposed.load(std::memory_order::seq_cst);
        }
 
    private:
        void dispose_impl(interface_disposable::Mode mode) noexcept final
        {
            // just need atomicity, not guarding anything
            if (m_disposed.exchange(true, std::memory_order::seq_cst) == false)
                base_dispose_impl(mode);
        }
 
    protected:
        virtual void base_dispose_impl(interface_disposable::Mode) noexcept {};
 
    private:
        std::atomic_bool m_disposed{};
    };
 
    using base_disposable           = base_disposable_impl<interface_disposable>;
    using base_composite_disposable = base_disposable_impl<interface_composite_disposable>;
} // namespace rpp::details