index_of.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2024 Tobias Hienzsch
 
#ifndef TETL_MPL_INDEX_OF_HPP
#define TETL_MPL_INDEX_OF_HPP
 
#include <etl/_cstddef/size_t.hpp>
#include <etl/_mpl/list.hpp>
#include <etl/_type_traits/integral_constant.hpp>
 
namespace etl::mpl {
 
/// \ingroup mpl
/// @{
 
template <typename T, typename List>
struct index_of;
 
template <typename T, typename List>
inline constexpr auto index_of_v = index_of<T, List>::value;
 
template <typename Head, typename... Tail>
struct index_of<Head, list<Head, Tail...>> : etl::integral_constant<etl::size_t, 0> { };
 
template <typename T, typename Head, typename... Tail>
struct index_of<T, list<Head, Tail...>> : etl::integral_constant<etl::size_t, index_of_v<T, list<Tail...>> + 1> { };
 
/// @}
 
} // namespace etl::mpl
 
#endif // TETL_MPL_INDEX_OF_HPP