pub enum ConstValue<'tcx> {
    Scalar(Scalar<AllocId>),
    ZeroSized,
    Slice {
        data: ConstAllocation<'tcx>,
        start: usize,
        end: usize,
    },
    ByRef {
        alloc: ConstAllocation<'tcx>,
        offset: Size,
    },
}
Expand description

Represents a constant value in Rust. Scalar and Slice are optimizations for array length computations, enum discriminants and the pattern matching logic.

Variants§

§

Scalar(Scalar<AllocId>)

Used only for types with layout::abi::Scalar ABI.

Not using the enum Value to encode that this must not be Uninit.

§

ZeroSized

Only used for ZSTs.

§

Slice

Fields

§data: ConstAllocation<'tcx>
§start: usize
§end: usize

Used only for &[u8] and &str

§

ByRef

Fields

§alloc: ConstAllocation<'tcx>

The backing memory of the value, may contain more memory than needed for just the value in order to share ConstAllocations between values

§offset: Size

Offset into alloc

A value not represented/representable by Scalar or Slice

Auto Trait Implementations§

§

impl<'tcx> RefUnwindSafe for ConstValue<'tcx>

§

impl<'tcx> Send for ConstValue<'tcx>

§

impl<'tcx> Sync for ConstValue<'tcx>

§

impl<'tcx> Unpin for ConstValue<'tcx>

§

impl<'tcx> UnwindSafe for ConstValue<'tcx>

Blanket Implementations§

source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

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

Mutably borrows from an owned value. Read more
§

impl<T> CallHasher for Twhere T: Hash + ?Sized,

§

default fn get_hash<H, B>(value: &H, build_hasher: &B) -> u64where H: Hash + ?Sized, B: BuildHasher,

source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

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

source§

fn into(self) -> U

Calls U::from(self).

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

source§

impl<T> ToOwned for Twhere T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

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

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.