bitvec::index

Struct BitIdx

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pub struct BitIdx<R = usize>
where
    R: BitRegister,
{ /* private fields */ }
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.

Implementations§

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impl<R> BitIdx<R>
where R: BitRegister,

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pub const MAX: Self = _

The inclusive maximum index within an R element.

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pub const MIN: Self = _

The inclusive minimum index within an R element.

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pub fn new(idx: u8) -> Result<Self, BitIdxError<R>>

Wraps a counter value as a known-good index into an R register.

§Parameters
  • idx: The counter value to mark as an index. This must be in the range 0 .. R::BITS.
§Returns

This returns idx, either marked as a valid BitIdx or an invalid BitIdxError by whether it is within the valid range 0 .. R::BITS.

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pub unsafe fn new_unchecked(idx: u8) -> Self

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 range 0 .. 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.

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pub fn into_inner(self) -> u8

Removes the index wrapper, leaving the internal counter.

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pub fn next(self) -> (Self, bool)

Increments an index counter, wrapping at the back edge of the register.

§Parameters
  • self: The index to increment.
§Returns
  • .0: The next index after self.
  • .1: Indicates whether the new index is in the next memory address.
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pub fn prev(self) -> (Self, bool)

Decrements an index counter, wrapping at the front edge of the register.

§Parameters
  • self: The index to decrement.
§Returns
  • .0: The previous index before self.
  • .1: Indicates whether the new index is in the previous memory address.
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pub fn position<O>(self) -> BitPos<R>
where O: BitOrder,

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.

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pub fn select<O>(self) -> BitSel<R>
where O: BitOrder,

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.

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pub fn mask<O>(self) -> BitMask<R>
where O: BitOrder,

Computes the bit selector for self as an accessor mask.

This is a type-cast over Self::select.

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pub fn range( self, upto: BitEnd<R>, ) -> impl Iterator<Item = Self> + 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.

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pub fn range_all() -> impl Iterator<Item = Self> + DoubleEndedIterator + ExactSizeIterator + FusedIterator

Iterates over all possible index values.

Trait Implementations§

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impl<R> Binary for BitIdx<R>
where R: BitRegister,

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fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<R> Clone for BitIdx<R>
where R: BitRegister + Clone,

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fn clone(&self) -> BitIdx<R>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<R> Debug for BitIdx<R>
where R: BitRegister,

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fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<R> Default for BitIdx<R>
where R: BitRegister + Default,

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fn default() -> BitIdx<R>

Returns the “default value” for a type. Read more
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impl<R> Display for BitIdx<R>
where R: BitRegister,

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fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<R> Hash for BitIdx<R>
where R: BitRegister + Hash,

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<R> Ord for BitIdx<R>
where R: BitRegister + Ord,

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fn cmp(&self, other: &BitIdx<R>) -> Ordering

This method returns an Ordering between self and other. Read more
1.21.0 · Source§

fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized,

Restrict a value to a certain interval. Read more
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impl<R> PartialEq for BitIdx<R>
where R: BitRegister + PartialEq,

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fn eq(&self, other: &BitIdx<R>) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<R> PartialOrd for BitIdx<R>
where R: BitRegister + PartialOrd,

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fn partial_cmp(&self, other: &BitIdx<R>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<R> Copy for BitIdx<R>
where R: BitRegister + Copy,

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impl<R> Eq for BitIdx<R>
where R: BitRegister + Eq,

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impl<R> StructuralPartialEq for BitIdx<R>
where R: BitRegister,

Auto Trait Implementations§

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impl<R> Freeze for BitIdx<R>

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impl<R> RefUnwindSafe for BitIdx<R>
where R: RefUnwindSafe,

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impl<R> Send for BitIdx<R>

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impl<R> Sync for BitIdx<R>

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impl<R> Unpin for BitIdx<R>

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impl<R> UnwindSafe for BitIdx<R>
where R: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> Conv for T

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fn conv<T>(self) -> T
where Self: Into<T>,

Converts self into T using Into<T>. Read more
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impl<T> FmtForward for T

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fn fmt_binary(self) -> FmtBinary<Self>
where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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fn fmt_display(self) -> FmtDisplay<Self>
where Self: Display,

Causes self to use its Display implementation when Debug-formatted.
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fn fmt_lower_exp(self) -> FmtLowerExp<Self>
where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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fn fmt_lower_hex(self) -> FmtLowerHex<Self>
where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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fn fmt_octal(self) -> FmtOctal<Self>
where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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fn fmt_pointer(self) -> FmtPointer<Self>
where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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fn fmt_upper_exp(self) -> FmtUpperExp<Self>
where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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fn fmt_upper_hex(self) -> FmtUpperHex<Self>
where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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fn fmt_list(self) -> FmtList<Self>
where &'a Self: for<'a> IntoIterator,

Formats each item in a sequence. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Pipe for T
where T: ?Sized,

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fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> R
where Self: Sized,

Pipes by value. This is generally the method you want to use. Read more
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fn pipe_ref<'a, R>(&'a self, func: impl FnOnce(&'a Self) -> R) -> R
where R: 'a,

Borrows self and passes that borrow into the pipe function. Read more
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fn pipe_ref_mut<'a, R>(&'a mut self, func: impl FnOnce(&'a mut Self) -> R) -> R
where R: 'a,

Mutably borrows self and passes that borrow into the pipe function. Read more
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fn pipe_borrow<'a, B, R>(&'a self, func: impl FnOnce(&'a B) -> R) -> R
where Self: Borrow<B>, B: 'a + ?Sized, R: 'a,

Borrows self, then passes self.borrow() into the pipe function. Read more
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fn pipe_borrow_mut<'a, B, R>( &'a mut self, func: impl FnOnce(&'a mut B) -> R, ) -> R
where Self: BorrowMut<B>, B: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.borrow_mut() into the pipe function. Read more
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fn pipe_as_ref<'a, U, R>(&'a self, func: impl FnOnce(&'a U) -> R) -> R
where Self: AsRef<U>, U: 'a + ?Sized, R: 'a,

Borrows self, then passes self.as_ref() into the pipe function.
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fn pipe_as_mut<'a, U, R>(&'a mut self, func: impl FnOnce(&'a mut U) -> R) -> R
where Self: AsMut<U>, U: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.as_mut() into the pipe function.
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fn pipe_deref<'a, T, R>(&'a self, func: impl FnOnce(&'a T) -> R) -> R
where Self: Deref<Target = T>, T: 'a + ?Sized, R: 'a,

Borrows self, then passes self.deref() into the pipe function.
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fn pipe_deref_mut<'a, T, R>( &'a mut self, func: impl FnOnce(&'a mut T) -> R, ) -> R
where Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.deref_mut() into the pipe function.
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impl<T> Tap for T

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fn tap(self, func: impl FnOnce(&Self)) -> Self

Immutable access to a value. Read more
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fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self

Mutable access to a value. Read more
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fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Self
where Self: Borrow<B>, B: ?Sized,

Immutable access to the Borrow<B> of a value. Read more
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fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut<B>, B: ?Sized,

Mutable access to the BorrowMut<B> of a value. Read more
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fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Self
where Self: AsRef<R>, R: ?Sized,

Immutable access to the AsRef<R> view of a value. Read more
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fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Self
where Self: AsMut<R>, R: ?Sized,

Mutable access to the AsMut<R> view of a value. Read more
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fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Self
where Self: Deref<Target = T>, T: ?Sized,

Immutable access to the Deref::Target of a value. Read more
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fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Mutable access to the Deref::Target of a value. Read more
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fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self

Calls .tap() only in debug builds, and is erased in release builds.
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fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self

Calls .tap_mut() only in debug builds, and is erased in release builds.
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fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
where Self: Borrow<B>, B: ?Sized,

Calls .tap_borrow() only in debug builds, and is erased in release builds.
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fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut<B>, B: ?Sized,

Calls .tap_borrow_mut() only in debug builds, and is erased in release builds.
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fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
where Self: AsRef<R>, R: ?Sized,

Calls .tap_ref() only in debug builds, and is erased in release builds.
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fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
where Self: AsMut<R>, R: ?Sized,

Calls .tap_ref_mut() only in debug builds, and is erased in release builds.
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fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
where Self: Deref<Target = T>, T: ?Sized,

Calls .tap_deref() only in debug builds, and is erased in release builds.
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fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Calls .tap_deref_mut() only in debug builds, and is erased in release builds.
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impl<T> TryConv for T

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fn try_conv<T>(self) -> Result<T, Self::Error>
where Self: TryInto<T>,

Attempts to convert self into T using TryInto<T>. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte