parameter_pack.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#pragma once
 
#include <algorithm>
#include <AUI/Traits/concepts.h>
 
namespace aui {
   namespace impl {
       template<typename First, typename... Up>
       struct first {
           using type = First;
       };
   }

   namespace parameter_pack {
       template<typename Callable, typename... Args>
       static void for_each(Callable&& c, Args&&... args) requires (... && aui::invocable<Callable, Args>) {
           (..., [&] {
               c(std::forward<Args>(args));
           }());
       }
 
       template<typename... Types>
       using first = typename impl::first<Types...>::type;
   };
 
   template<typename... Args>
   struct tuple_visitor;
 
   template<typename... Args>
   struct tuple_visitor<std::tuple<Args...>> {

       template<typename Callable>
       static void for_each_single(Callable&& c) {
           (..., c.template operator()<Args>());
       }

       template<typename Callable>
       static auto for_each_all(Callable&& c) {
           return c.template operator()<Args...>();
       }

       template<typename Callable>
       static auto for_each_make_tuple(Callable&& c) {
           return for_each_make_tuple_impl<Callable&&, Args...>(std::forward<Callable>(c));
       }
 
   private:
       template<typename Callable, typename First, typename... Remaining>
       static auto for_each_make_tuple_impl(Callable&& c) {
           auto x = c.template operator()<First>();
           return std::tuple_cat(std::make_tuple(std::move(x)),
                                 for_each_make_tuple_impl<Callable&&, Remaining...>(std::forward<Callable>(c)));
       }
       template<typename Callable>
       static auto for_each_make_tuple_impl(Callable&& c) {
           return std::make_tuple();
       }
   };
}

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