index_of.hpp

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// SPDX-License-Identifier: BSL-1.0
 
#ifndef TETL_META_INDEX_OF_HPP
#define TETL_META_INDEX_OF_HPP
 
#include <etl/_cstddef/size_t.hpp>
#include <etl/_meta/list.hpp>
#include <etl/_type_traits/integral_constant.hpp>
 
namespace etl::meta {
 
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::meta
 
#endif // TETL_META_INDEX_OF_HPP