switch_on_next.hpp

//                  ReactivePlusPlus library
//
//          Copyright Aleksey Loginov 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/constraints.hpp>
#include <rpp/observables/details/member_overload.hpp>
 
namespace rpp::details
{
    struct switch_on_next_tag;
}
 
namespace rpp::details
{
template<constraint::decayed_type Type>
struct switch_on_next_impl;
 
template<constraint::decayed_type Type, typename SpecificObservable>
struct member_overload<Type, SpecificObservable, switch_on_next_tag>
{
    template<typename ...Args>
    auto switch_on_next() const& requires (is_header_included<switch_on_next_tag, Args...>&& rpp::constraint::observable<Type>)
    {
        return static_cast<const SpecificObservable*>(this)->template lift<utils::extract_observable_type_t<Type>>(switch_on_next_impl<Type>());
    }
 
    template<typename ...Args>
    auto switch_on_next() && requires (is_header_included<switch_on_next_tag, Args...>&& rpp::constraint::observable<Type>)
    {
        return std::move(*static_cast<SpecificObservable*>(this)).template lift<utils::extract_observable_type_t<Type>>(switch_on_next_impl<Type>());
    }
};
} // namespace rpp::details