rank.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2021 Tobias Hienzsch
 
#ifndef TETL_TYPE_TRAITS_RANK_HPP
#define TETL_TYPE_TRAITS_RANK_HPP
 
#include <etl/_cstddef/size_t.hpp>
#include <etl/_type_traits/integral_constant.hpp>
 
namespace etl {
 
/// \brief If Type is an array type, provides the member constant value equal to
/// the number of dimensions of the array. For any other type, value is 0. The
/// behavior of a program that adds specializations for rank or rank_v is
/// undefined.
template <typename T>
struct rank : integral_constant<size_t, 0> { };
 
template <typename T>
struct rank<T[]> : integral_constant<size_t, rank<T>::value + 1> { };
 
template <typename T, size_t N>
struct rank<T[N]> : integral_constant<size_t, rank<T>::value + 1> { };
 
template <typename Type>
inline constexpr size_t rank_v = rank<Type>::value;
 
} // namespace etl
 
#endif // TETL_TYPE_TRAITS_RANK_HPP