merge.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 merge_tag;
}
 
namespace rpp::details
{
template<constraint::decayed_type Type>
struct merge_impl;
 
template<constraint::decayed_type Type, constraint::observable_of_type<Type> ... TObservables>
auto merge_with_impl(TObservables&&... observables);
 
template<constraint::decayed_type Type, typename SpecificObservable>
struct member_overload<Type, SpecificObservable, merge_tag>
{
    template<typename ...Args>
    auto merge() const& requires (is_header_included<merge_tag, Args...> && rpp::constraint::observable<Type>)
    {
        return static_cast<const SpecificObservable*>(this)->template lift<utils::extract_observable_type_t<Type>>(merge_impl<Type>{});
    }
 
    template<typename ...Args>
    auto merge() && requires (is_header_included<merge_tag, Args...>&& rpp::constraint::observable<Type>)
    {
        return std::move(*static_cast<SpecificObservable*>(this)).template lift<utils::extract_observable_type_t<Type>>(merge_impl<Type>{});
    }
 
    template<constraint::observable_of_type<Type> ...TObservables>
    auto merge_with(TObservables&&... observables) const& requires (is_header_included<merge_tag, TObservables...>&& sizeof...(TObservables) >= 1)
    {
        return merge_with_impl<Type>(static_cast<const SpecificObservable*>(this)->as_dynamic(), std::forward<TObservables>(observables).as_dynamic()...);
    }
 
    template<constraint::observable_of_type<Type> ...TObservables>
    auto merge_with(TObservables&&... observables) && requires (is_header_included<merge_tag, TObservables...> && sizeof...(TObservables) >= 1)
    {
        return merge_with_impl<Type>(std::move(*static_cast<SpecificObservable*>(this)).as_dynamic(), std::forward<TObservables>(observables).as_dynamic()...);
    }
};
} // namespace rpp::details