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32 lines
671 B
32 lines
671 B
6 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 <utils/popcount.hpp>
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#include "h_types.hpp"
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namespace detail
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{
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/// Returns the number of bits set in val
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template <class T>
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constexpr inline size_t count_bits(T val, size_t count = 0) noexcept
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{
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#ifdef __SIZEOF_INT128__
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if constexpr (!std::is_same_v<T, unsigned __int128>)
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#endif
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return popcnt(&val, sizeof(T));
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}
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} // namespace detail
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