variant.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 <cstdint>
#include <type_traits>
 
namespace aui::variant {

template<typename Variant, typename Type>
struct index_of {
private:
   template<std::size_t i, std::size_t... next>
   static constexpr std::size_t value_impl2(std::index_sequence<i, next...>) {
       if constexpr (std::is_same_v<std::variant_alternative_t<i, Variant>, Type>) {
           return i;
       } else {
           return value_impl2(std::index_sequence<next...>{});
       }
   }
 
   static constexpr std::size_t value_impl() {
       return value_impl2(std::make_index_sequence<std::variant_size_v<Variant>>());
   }
public:
   static constexpr std::size_t value = value_impl();
};
}

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