Enum Shift 

#[repr(u8)]
pub enum Shift {
    Error = 0,
    Mask = 1,
    Saturate = 2,
}

The shift policy: what shl and shr do when the amount is at least the bit width, or negative for a signed amount.

Examples

use bytecode_lang::Shift;

assert_eq!(Shift::default(), Shift::Error);
assert_eq!(Shift::from_code(2), Some(Shift::Saturate));
assert_eq!(Shift::from_code(3), None);

Variants

Error = 0

Raise ShiftOutOfRange (E0003) through the language’s error model.

Mask = 1

Use the amount modulo the width (n & (width - 1)); never an error.

Saturate = 2

PHP’s rule (OPS v2): an amount at or above the width gives 0 (shr of a negative signed value gives -1); a negative amount is still ShiftOutOfRange (E0003), never masked.

Implementations

impl Shift

pub const ALL: &'static [Shift]

Every value, in code order.

pub const fn from_code(code: u8) -> Option<Self>

The value with this stable code, or None if no value has it.

pub const fn code(self) -> u8

The stable code this value is encoded as.

pub const fn name(self) -> &'static str

The lowercase name the disassembler prints.

Trait Implementations

impl Clone for Shift

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Shift

impl Debug for Shift

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

Formats the value using the given formatter.

impl Default for Shift

fn default() -> Self

Returns the “default value” for a type.

impl Display for Shift

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

Formats the value using the given formatter.

impl Eq for Shift

impl Hash for Shift

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

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 Ord for Shift

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Shift

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Shift

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

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Shift