Struct BitIdx
#[repr(transparent)]pub struct BitIdx<R = usize>where
R: BitRegister,{
idx: u8,
_ty: PhantomData<R>,
}
Expand description
§Semantic Bit Index
This type is a counter in the ring 0 .. R::BITS
and serves to mark a semantic
index within some register element. It is a virtual index, and is the stored
value used in pointer encodings to track region start information.
It is translated to a real index through the BitOrder
trait. This virtual
index is the only counter that can be used for address computation, and once
lowered to an electrical index through BitOrder::at
, the electrical address
can only be used for setting up machine instructions.
§Type Parameters
R
: The register element that this index governs.
§Validity
Values of this type are required to be in the range 0 .. R::BITS
. Any
value not less than R::BITS
makes the program invalid, and will likely cause
either a crash or incorrect memory access.
§Construction
This type can never be constructed outside of the bitvec
crate. It is passed
in to BitOrder
implementations, which may use it to construct electrical
position values from it. All values of this type constructed by bitvec
are
known to be correct in their region; no other construction site can be trusted.
Fields§
§idx: u8
§_ty: PhantomData<R>
Implementations§
§impl<R> BitIdx<R>where
R: BitRegister,
impl<R> BitIdx<R>where
R: BitRegister,
pub fn new(idx: u8) -> Result<BitIdx<R>, BitIdxError<R>>
pub fn new(idx: u8) -> Result<BitIdx<R>, BitIdxError<R>>
pub unsafe fn new_unchecked(idx: u8) -> BitIdx<R>
pub unsafe fn new_unchecked(idx: u8) -> BitIdx<R>
Wraps a counter value as an assumed-good index into an R
register.
§Parameters
idx
: The counter value to mark as an index. This must be in the range0 .. R::BITS
.
§Returns
This unconditionally marks idx
as a valid bit-index.
§Safety
If the idx
value is outside the valid range, then the program is
incorrect. Debug builds will panic; release builds do not inspect the
value or specify a behavior.
pub fn into_inner(self) -> u8
Available on non-tarpaulin_include
only.
pub fn into_inner(self) -> u8
tarpaulin_include
only.Removes the index wrapper, leaving the internal counter.
pub fn position<O>(self) -> BitPos<R>where
O: BitOrder,
Available on non-tarpaulin_include
only.
pub fn position<O>(self) -> BitPos<R>where
O: BitOrder,
tarpaulin_include
only.Computes the bit position corresponding to self
under some ordering.
This forwards to O::at::<R>
, which is the only public, safe,
constructor for a position counter.
pub fn select<O>(self) -> BitSel<R>where
O: BitOrder,
Available on non-tarpaulin_include
only.
pub fn select<O>(self) -> BitSel<R>where
O: BitOrder,
tarpaulin_include
only.Computes the bit selector corresponding to self
under an ordering.
This forwards to O::select::<R>
, which is the only public, safe,
constructor for a bit selector.
pub fn mask<O>(self) -> BitMask<R>where
O: BitOrder,
Available on non-tarpaulin_include
only.
pub fn mask<O>(self) -> BitMask<R>where
O: BitOrder,
tarpaulin_include
only.Computes the bit selector for self
as an accessor mask.
This is a type-cast over Self::select
.
pub fn range(
self,
upto: BitEnd<R>,
) -> impl Iterator<Item = BitIdx<R>> + DoubleEndedIterator + ExactSizeIterator + FusedIterator
pub fn range( self, upto: BitEnd<R>, ) -> impl Iterator<Item = BitIdx<R>> + DoubleEndedIterator + ExactSizeIterator + FusedIterator
Iterates over all indices between an inclusive start and exclusive end point.
Because implementation details of the range type family, including the
RangeBounds
trait, are not yet stable, and heterogeneous ranges are
not supported, this must be an opaque iterator rather than a direct
Range<BitIdx<R>>
.
§Parameters
from
: The inclusive low bound of the range. This will be the first index produced by the iterator.upto
: The exclusive high bound of the range. The iterator will halt before yielding an index of this value.
§Returns
An opaque iterator that is equivalent to the range from .. upto
.
§Requirements
from
must be no greater than upto
.
pub fn range_all() -> impl Iterator<Item = BitIdx<R>> + DoubleEndedIterator + ExactSizeIterator + FusedIterator
pub fn range_all() -> impl Iterator<Item = BitIdx<R>> + DoubleEndedIterator + ExactSizeIterator + FusedIterator
Iterates over all possible index values.
Trait Implementations§
§impl<R> Binary for BitIdx<R>where
R: BitRegister,
impl<R> Binary for BitIdx<R>where
R: BitRegister,
§impl<R> Clone for BitIdx<R>where
R: Clone + BitRegister,
impl<R> Clone for BitIdx<R>where
R: Clone + BitRegister,
§impl<R> Debug for BitIdx<R>where
R: BitRegister,
impl<R> Debug for BitIdx<R>where
R: BitRegister,
§impl<R> Default for BitIdx<R>where
R: Default + BitRegister,
impl<R> Default for BitIdx<R>where
R: Default + BitRegister,
§impl<'de, R> Deserialize<'de> for BitIdx<R>where
R: BitRegister,
impl<'de, R> Deserialize<'de> for BitIdx<R>where
R: BitRegister,
§fn deserialize<D>(
deserializer: D,
) -> Result<BitIdx<R>, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
fn deserialize<D>(
deserializer: D,
) -> Result<BitIdx<R>, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
§impl<R> Display for BitIdx<R>where
R: BitRegister,
impl<R> Display for BitIdx<R>where
R: BitRegister,
§impl<R> Hash for BitIdx<R>where
R: Hash + BitRegister,
impl<R> Hash for BitIdx<R>where
R: Hash + BitRegister,
§impl<R> Ord for BitIdx<R>where
R: Ord + BitRegister,
impl<R> Ord for BitIdx<R>where
R: Ord + BitRegister,
§impl<R> PartialEq for BitIdx<R>where
R: PartialEq + BitRegister,
impl<R> PartialEq for BitIdx<R>where
R: PartialEq + BitRegister,
§impl<R> PartialOrd for BitIdx<R>where
R: PartialOrd + BitRegister,
impl<R> PartialOrd for BitIdx<R>where
R: PartialOrd + BitRegister,
§impl<R> Serialize for BitIdx<R>where
R: BitRegister,
impl<R> Serialize for BitIdx<R>where
R: BitRegister,
§fn serialize<S>(
&self,
serializer: S,
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>where
S: Serializer,
fn serialize<S>(
&self,
serializer: S,
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>where
S: Serializer,
impl<R> Copy for BitIdx<R>where
R: Copy + BitRegister,
impl<R> Eq for BitIdx<R>where
R: Eq + BitRegister,
impl<R> StructuralPartialEq for BitIdx<R>where
R: BitRegister,
Auto Trait Implementations§
impl<R> Freeze for BitIdx<R>
impl<R> RefUnwindSafe for BitIdx<R>where
R: RefUnwindSafe,
impl<R> Send for BitIdx<R>
impl<R> Sync for BitIdx<R>
impl<R> Unpin for BitIdx<R>
impl<R> UnwindSafe for BitIdx<R>where
R: UnwindSafe,
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Size: 1 byte