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52 lines
1.3 KiB
52 lines
1.3 KiB
3 months ago
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// BITSET2
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//
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// Copyright Claas Bontus
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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.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/ClaasBontus/bitset2
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//
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#pragma once
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#include "bit_chars.hpp"
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namespace detail
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{
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/// Computes the two's complement of the number encoded in the array
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template <size_t N, class T>
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struct array_complement2 {
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using base_t = T;
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using b_chars = bit_chars<N, T>;
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enum : base_t { hgh_bit_pattern = b_chars::hgh_bit_pattern };
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enum : size_t { n_array = b_chars::n_array };
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using array_t = typename h_types<T>::template array_t<n_array>;
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constexpr array_t comp2(array_t arr) const noexcept
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{
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comp2_assgn(arr);
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return arr;
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}
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constexpr void comp2_assgn(array_t &arr) const noexcept
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{
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base_t carry = base_t(1);
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for (size_t c = 0; c < n_array; ++c) {
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auto const sm = base_t(base_t(~arr[c]) + carry);
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carry = base_t((carry == base_t(1)) && (sm == 0));
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arr[c] = sm;
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} // for c
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arr[n_array - 1] &= hgh_bit_pattern;
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} // comp2_assgn
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}; // struct array_complement2
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} // namespace detail
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