iter_difference_t.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2023 Tobias Hienzsch
 
#ifndef TETL_ITERATOR_ITER_DIFFERENCE_T_HPP
#define TETL_ITERATOR_ITER_DIFFERENCE_T_HPP
 
#include <etl/_iterator/incrementable_traits.hpp>
#include <etl/_iterator/iterator_traits.hpp>
#include <etl/_type_traits/is_specialized.hpp>
#include <etl/_type_traits/remove_cvref.hpp>
 
namespace etl {
 
namespace detail {
 
template <typename T>
struct iter_difference {
    using type = typename etl::incrementable_traits<etl::remove_cvref_t<T>>::difference_type;
};
 
template <typename T>
    requires(is_specialized_v<etl::iterator_traits, etl::remove_cvref_t<T>>)
struct iter_difference<T> {
    using type = typename etl::iterator_traits<etl::remove_cvref_t<T>>::difference_type;
};
 
} // namespace detail
 
/// \ingroup iterator
template <typename T>
using iter_difference_t = typename detail::iter_difference<T>::type;
 
} // namespace etl
 
#endif // TETL_ITERATOR_ITER_DIFFERENCE_T_HPP