76 lines
1.6 KiB
C++
76 lines
1.6 KiB
C++
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#pragma once
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#if !defined(MIJIN_UTIL_BITARRAY_HPP_INCLUDED)
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#define MIJIN_UTIL_BITARRAY_HPP_INCLUDED 1
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#include <array>
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#include <atomic>
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#include <cstddef>
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namespace mijin
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{
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//
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// public defines
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//
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//
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// public constants
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//
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//
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// public types
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//
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template<std::size_t numBits, bool threadSafe = false>
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struct BitArray
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{
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private:
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using byte_type = std::conditional_t<threadSafe, std::atomic_uint8_t, std::uint8_t>;
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std::array<byte_type, (numBits + 7) / 8> bytes;
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public:
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[[nodiscard]] bool get(std::size_t index) const
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{
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MIJIN_ASSERT(index < numBits, "BitArray: index out of range.");
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return (bytes[index / 8] & (1 << (index % 8)));
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}
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void set(std::size_t index, bool value)
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{
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byte_type& byte = bytes[index / 8];
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const std::uint8_t mask = (1 << (index % 8));
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if constexpr (threadSafe)
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{
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std::uint8_t oldByte = byte.load(std::memory_order_relaxed);
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std::uint8_t newByte = 0;
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do
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{
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if (value) {
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newByte = oldByte | mask;
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}
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else {
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newByte = oldByte & ~mask;
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}
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} while (!byte.compare_exchange_weak(oldByte, newByte, std::memory_order_release, std::memory_order_relaxed));
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}
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else
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{
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if (value) {
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byte |= mask;
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}
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else {
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byte &= ~mask;
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}
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}
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}
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};
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//
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// public functions
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//
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} // namespace mijin
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#endif // !defined(MIJIN_UTIL_BITARRAY_HPP_INCLUDED)
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