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62 lines
1.6 KiB
62 lines
1.6 KiB
// 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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/// \brief Takes a variable 'v' of type LRGST_t
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/// (unsigned long long or unsigned __int128)
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/// and returns a std::array 'a' equivalent to v. 'a' represents
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/// an N bit bitset2 with base_t == T.
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template <size_t N, class T>
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struct lrgst2array {
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using base_t = T;
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using b_c = bit_chars<N, T>;
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using LRGST_t = typename b_c::LRGST_t;
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enum : size_t {
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n_bits = N,
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base_t_n_bits = b_c::base_t_n_bits,
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lrgst_n_bist = b_c::lrgst_n_bist,
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n_array = b_c::n_array,
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centrl_i = ce_min((lrgst_n_bist - 1) / base_t_n_bits, n_array - 1),
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n_empty_vals = n_array - centrl_i - 1
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};
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enum : base_t {
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hgh_bit_pattern = b_c::hgh_bit_pattern,
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use_pattern = (n_empty_vals == 0) ? hgh_bit_pattern : base_t(~base_t(0))
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};
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using array_t = typename h_types<T>::template array_t<n_array>;
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constexpr array_t operator()(LRGST_t v) const noexcept
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{
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array_t retval = (detail::gen_empty_array<n_array, T>)();
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size_t c = 0;
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for (; c < centrl_i; ++c) {
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retval[c] = base_t(v);
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v = ce_right_shift(v, base_t_n_bits);
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}
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retval[c] = base_t(v & use_pattern);
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return retval;
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}
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}; // struct lrgst2array
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} // namespace detail
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