99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
/*------------------------------------------------------------------------------*
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* Architecture & Implementation of DBMS *
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*------------------------------------------------------------------------------*
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* Copyright 2022 Databases and Information Systems Group TU Dortmund *
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* Visit us at *
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* http://dbis.cs.tu-dortmund.de/cms/en/home/ *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
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* OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Authors: *
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* Maximilian Berens <maximilian.berens@tu-dortmund.de> *
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* Roland Kühn <roland.kuehn@cs.tu-dortmund.de> *
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* Jan Mühlig <jan.muehlig@tu-dortmund.de> *
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*------------------------------------------------------------------------------*
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*/
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#pragma once
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#include <cassert>
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#include <cstdint>
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namespace beedb::compression
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{
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class WAHBitVector
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{
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public:
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WAHBitVector() : _is_literal_word(0), _content(0)
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{
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}
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~WAHBitVector() = default;
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inline bool is_fill() const
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{
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return _is_literal_word == 0;
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}
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inline bool is_literal() const
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{
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return _is_literal_word;
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}
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inline void is_fill(bool is_fill)
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{
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_is_literal_word = !is_fill;
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}
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inline bool fill_bit() const
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{
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return _content >> 30;
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}
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inline void fill_bit(const bool fill_bit)
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{
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_content = (fill_bit << 30) | count();
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}
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inline std::uint32_t count() const
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{
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return _content & 0x3FFFFFFF;
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}
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WAHBitVector &operator++()
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{
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_content = (count() + 1) | (fill_bit() << 30);
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return *this;
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}
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WAHBitVector operator++(int)
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{
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WAHBitVector copy(*this);
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++(*this);
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return copy;
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}
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inline void set(const std::size_t index, const bool bit)
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{
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assert(index >= 0 && index <= 31);
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_content ^= (-bit ^ _content) & (1UL << index);
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}
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inline bool get(const std::size_t index) const
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{
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assert(index >= 0 && index <= 31);
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return (_content >> index) & 1U;
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}
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inline void clear()
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{
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_content = 0;
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}
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private:
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std::uint32_t _is_literal_word : 1, _content : 31;
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} __attribute__((packed));
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} // namespace beedb::compression
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