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bit_field: Left/right shifts are well defined in C++20

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Morph 2023-07-19 14:07:19 -04:00
parent 334567d33b
commit 7ad3e3c7bb
1 changed files with 4 additions and 0 deletions
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src/common/new_bit_field.h
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@ -175,6 +175,10 @@ constexpr OutputType ExtractBits(const RawType& raw) {
static_assert(sizeof(RawType) == sizeof(SignedType));
constexpr auto RightShift = BitSize<RawType>() - NumBits;
constexpr auto LeftShift = RightShift - Position;
// C++20: Signed Integers are Two’s Complement
// Left-shift on signed integer types produces the same results as
// left-shift on the corresponding unsigned integer type.
// Right-shift is an arithmetic right shift which performs sign-extension.
return AutoBitCast<OutputType>((AutoBitCast<SignedType>(raw) << LeftShift) >> RightShift);
} else {
using UnsignedType = SmallestUIntType<BitSize<RawType>()>;