reduce.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2020 Tobias Hienzsch
#ifndef TETL_NUMERIC_REDUCE_HPP
#define TETL_NUMERIC_REDUCE_HPP
 
#include <etl/_functional/plus.hpp>
#include <etl/_iterator/iterator_traits.hpp>
#include <etl/_numeric/accumulate.hpp>
#include <etl/_utility/move.hpp>
 
namespace etl {
 
/// \brief Similar to etl::accumulate.
/// \details https://en.cppreference.com/w/cpp/algorithm/reduce
/// \ingroup numeric
template <typename InputIter, typename T, typename BinaryOp>
[[nodiscard]] constexpr auto reduce(InputIter first, InputIter last, T init, BinaryOp op) -> T
{
    return accumulate(first, last, init, op);
}
 
/// \brief Similar to etl::accumulate.
/// \details https://en.cppreference.com/w/cpp/algorithm/reduce
/// \ingroup numeric
template <typename InputIter, typename T>
[[nodiscard]] constexpr auto reduce(InputIter first, InputIter last, T init) -> T
{
    return reduce(first, last, init, etl::plus<>());
}
 
/// \brief Similar to etl::accumulate.
/// \details https://en.cppreference.com/w/cpp/algorithm/reduce
/// \ingroup numeric
template <typename InputIter>
[[nodiscard]] constexpr auto reduce(InputIter first, InputIter last) ->
    typename etl::iterator_traits<InputIter>::value_type
{
    auto init = typename etl::iterator_traits<InputIter>::value_type{};
    return reduce(first, last, init);
}
 
} // namespace etl
 
#endif // TETL_NUMERIC_REDUCE_HPP