observe_on.hpp

//                   ReactivePlusPlus library
//
//           Copyright Aleksey Loginov 2022 - present.
//                             TC Wang 2022 - 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/victimsnino/ReactivePlusPlus
 
#pragma once
 
#include <rpp/observables/details/member_overload.hpp>
#include <rpp/schedulers/constraints.hpp>
 
namespace rpp::details
{
struct observe_on_tag;
}
 
namespace rpp::details
{
template<constraint::decayed_type Type, schedulers::constraint::scheduler TScheduler>
struct observe_on_impl;
 
template<constraint::decayed_type Type, typename SpecificObservable>
struct member_overload<Type, SpecificObservable, observe_on_tag>
{
    template<schedulers::constraint::scheduler TScheduler>
    auto observe_on(TScheduler&& scheduler) const& requires is_header_included<observe_on_tag, TScheduler>
    {
        return cast_this()->delay(schedulers::duration{0}, std::forward<TScheduler>(scheduler));
    }
 
    template<schedulers::constraint::scheduler TScheduler>
    auto observe_on(TScheduler&& scheduler) && requires is_header_included<observe_on_tag, TScheduler>
    {
        return move_this().delay(schedulers::duration{0}, std::forward<TScheduler>(scheduler));
    }
 
private:
    const SpecificObservable* cast_this() const
    {
        return static_cast<const SpecificObservable*>(this);
    }
 
    SpecificObservable&& move_this()
    {
        return std::move(*static_cast<SpecificObservable*>(this));
    }
};
} // namespace rpp::details