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Add more utility functionality for checking / setting bitfields
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,16 +1,95 @@ | ||
| #ifndef EDM4HEP_UTILS_BIT_UTILS_HH | ||
| #define EDM4HEP_UTILS_BIT_UTILS_HH | ||
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| #include <type_traits> | ||
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| namespace edm4hep::utils { | ||
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| /// Set a bit in the passed bitfield to the desired value | ||
| /// | ||
| /// @tparam T any integer type that can be used as a bitfield, typically an | ||
| /// unsigned integer type | ||
| /// | ||
| /// @param bitfield The bitfield for which the bit should be set | ||
| /// @param bit The bit (number) that should be set | ||
| /// @param value The value to which the bit should be set | ||
| /// | ||
| /// @returns The new value of the bitfield after setting bits | ||
| template <typename T> | ||
| constexpr T setBit(T bits, int bitNum, bool value) { | ||
| return (bits & ~(1 << bitNum)) | (value << bitNum); | ||
| constexpr T setBit(T bitfield, int bit, bool value) { | ||
| return (bitfield & ~(0x1 << bit)) | (value << bit); | ||
| } | ||
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| /// Set multiple bits to one desired value in the passed bitfield | ||
| /// | ||
| /// @tparam T any integer type that can be used as a bitfield, typically an | ||
| /// unsigned integer type | ||
| /// @tparam Bits A variable number of bits (numbers) that should be set | ||
| /// | ||
| /// @param bitfield The bitfield for which the bit should be set | ||
| /// @param value The value to which the bit should be set | ||
| /// @param bits The bits that should be set | ||
| template <typename T, typename... Bits> | ||
| constexpr T setBits(T bitfield, bool value, Bits... bits) { | ||
| static_assert((std::is_same_v<Bits, int> && ...), "All bit numbers to set must be integers"); | ||
| static_assert(sizeof...(bits) > 0, "Need at least one bit to set"); | ||
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| for (auto n : {bits...}) { | ||
| bitfield = setBit(bitfield, n, value); | ||
| } | ||
| return bitfield; | ||
| } | ||
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| /// Check if a bit is set in the bitfield | ||
| /// | ||
| /// @tparam T any integer type that can be used as a bitfield, typically an | ||
| /// unsigned integer type | ||
| /// | ||
| /// @param bitfield The bitfield that should be checked | ||
| /// @param bit The bit (number) that should be checked | ||
| /// | ||
| /// @returns true if the passed bit is set in the bitfield and false otherwise | ||
| template <typename T> | ||
| constexpr bool checkBit(T bits, int bitNum) { | ||
| return bits & (0x1 << bitNum); | ||
| constexpr bool checkBit(T bitfield, int bit) { | ||
| return bitfield & (0x1 << bit); | ||
| } | ||
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| /// Check if all the passed bits are set in the bitfield | ||
| /// | ||
| /// @tparam T any integer type that can be used as a bitfield, typically an | ||
| /// unsigned integer type | ||
| /// @tparam Bits A variable number of bits (numbers) that should be checked | ||
| /// | ||
| /// @param bitfield The bitfield that should be checked | ||
| /// @param bits The bits that should be checked | ||
| /// | ||
| /// @returns true if all the passed bits are set in the bitfield and false | ||
| /// otherwise | ||
| template <typename T, typename... Bits> | ||
| constexpr bool checkAllBits(T bitfield, Bits... bits) { | ||
| static_assert((std::is_same_v<Bits, int> && ...), "All bit numbers to set must be integers"); | ||
| static_assert(sizeof...(bits) > 0, "Need at least one bit to check"); | ||
| return (true && ... && checkBit(bitfield, bits)); | ||
| } | ||
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| /// Check if any of the passed bits is set in the bitfield | ||
| /// | ||
| /// @tparam T any integer type that can be used as a bitfield, typically an | ||
| /// unsigned integer type | ||
| /// @tparam Bits A variable number of bits (numbers) that should be checked | ||
| /// | ||
| /// @param bitfield The bitfield that should be checked | ||
| /// @param bits The bits that should be checked | ||
| /// | ||
| /// @returns true if any of the passed bits is set in the bitfield and false | ||
| /// otherwise | ||
| template <typename T, typename... Bits> | ||
| constexpr bool checkAnyBits(T bitfield, Bits... bits) { | ||
| static_assert((std::is_same_v<Bits, int> && ...), "All bit numbers to set must be integers"); | ||
| static_assert(sizeof...(bits) > 0, "Need at least one bit to check"); | ||
| return (false || ... || checkBit(bitfield, bits)); | ||
| } | ||
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| } // namespace edm4hep::utils | ||
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| #endif // EDM4HEP_UTILS_BIT_UTILS_HH |