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68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2013-present
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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#ifndef RANGES_V3_NUMERIC_ACCUMULATE_HPP
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#define RANGES_V3_NUMERIC_ACCUMULATE_HPP
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#include <meta/meta.hpp>
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#include <range/v3/functional/arithmetic.hpp>
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#include <range/v3/functional/identity.hpp>
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#include <range/v3/functional/invoke.hpp>
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#include <range/v3/iterator/concepts.hpp>
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#include <range/v3/iterator/traits.hpp>
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#include <range/v3/range/access.hpp>
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#include <range/v3/range/concepts.hpp>
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#include <range/v3/range/traits.hpp>
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#include <range/v3/utility/static_const.hpp>
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#include <range/v3/detail/prologue.hpp>
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namespace ranges
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{
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/// \addtogroup group-numerics
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/// @{
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struct accumulate_fn
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{
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template(typename I, typename S, typename T, typename Op = plus,
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typename P = identity)(
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requires sentinel_for<S, I> AND input_iterator<I> AND
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indirectly_binary_invocable_<Op, T *, projected<I, P>> AND
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assignable_from<T &, indirect_result_t<Op &, T *, projected<I, P>>>)
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T operator()(I first, S last, T init, Op op = Op{},
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P proj = P{}) const
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{
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for(; first != last; ++first)
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init = invoke(op, init, invoke(proj, *first));
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return init;
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}
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template(typename Rng, typename T, typename Op = plus, typename P = identity)(
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requires input_range<Rng> AND
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indirectly_binary_invocable_<Op, T *, projected<iterator_t<Rng>, P>> AND
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assignable_from<
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T &, indirect_result_t<Op &, T *, projected<iterator_t<Rng>, P>>>)
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T operator()(Rng && rng, T init, Op op = Op{}, P proj = P{}) const
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{
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return (*this)(
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begin(rng), end(rng), std::move(init), std::move(op), std::move(proj));
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}
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};
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RANGES_INLINE_VARIABLE(accumulate_fn, accumulate)
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/// @}
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} // namespace ranges
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#include <range/v3/detail/epilogue.hpp>
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#endif
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