Enum Constant

pub enum Constant<'tcx> {
    Adt(Const<'tcx>),
    Str(String),
    Binary(Vec<u8>),
    Char(char),
    Int(u128),
    F16(u16),
    F32(f32),
    F64(f64),
    F128(u128),
    Bool(bool),
    Vec(Vec<Constant<'tcx>>),
    Repeat(Box<Constant<'tcx>>, u64),
    Tuple(Vec<Constant<'tcx>>),
    RawPtr(u128),
    Ref(Box<Constant<'tcx>>),
    Err,
}

A LitKind-like enum to fold constant Exprs into.

Variants

Adt(Const<'tcx>)

Str(String)

A String (e.g., “abc”).

Binary(Vec<u8>)

A binary string (e.g., b"abc").

Char(char)

A single char (e.g., 'a').

Int(u128)

An integer’s bit representation.

F16(u16)

An f16 bitcast to a u16.

F32(f32)

An f32.

F64(f64)

An f64.

F128(u128)

An f128 bitcast to a u128.

Bool(bool)

true or false.

Vec(Vec<Constant<'tcx>>)

An array of constants.

Repeat(Box<Constant<'tcx>>, u64)

Also an array, but with only one constant, repeated N times.

Tuple(Vec<Constant<'tcx>>)

A tuple of constants.

RawPtr(u128)

A raw pointer.

Ref(Box<Constant<'tcx>>)

A reference

Err

A literal with syntax error.

Implementations

impl Constant<'_>

pub fn partial_cmp( tcx: TyCtxt<'_>, cmp_type: Ty<'_>, left: &Self, right: &Self, ) -> Option<Ordering>

pub fn int_value(&self, tcx: TyCtxt<'_>, val_type: Ty<'_>) -> Option<FullInt>

Returns the integer value or None if self or val_type is not integer type.

pub fn peel_refs(self) -> Self

fn parse_f16(s: &str) -> Self

fn parse_f128(s: &str) -> Self

Trait Implementations

impl<'tcx> Clone for Constant<'tcx>

fn clone(&self) -> Constant<'tcx>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'tcx> Debug for Constant<'tcx>

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

Formats the value using the given formatter.

impl Hash for Constant<'_>

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

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Constant<'_>

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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: 48 bytes

Size for each variant:

• Adt: 40 bytes
• Str: 32 bytes
• Binary: 32 bytes
• Char: 12 bytes
• Int: 32 bytes
• F16: 10 bytes
• F32: 12 bytes
• F64: 16 bytes
• F128: 32 bytes
• Bool: 9 bytes
• Vec: 32 bytes
• Repeat: 24 bytes
• Tuple: 32 bytes
• RawPtr: 32 bytes
• Ref: 16 bytes
• Err: 0 bytes