Trait Elem 

pub trait Elem:
    'static
    + Clone
    + Copy
    + Send
    + Sync
    + Debug
    + Sized
    + Neg<Output = Self>
    + SubAssign
    + PartialEq
    + Eq
    + Clone
    + Copy
    + NoUninit
    + CheckedBitPattern
    + Default
    + Add<Self, Output = Self>
    + Sub<Self, Output = Self>
    + Mul<Self, Output = Self>
    + AddAssign<Self>
    + SubAssign<Self>
    + MulAssign<Self> {
    const INVALID: Self;
    const ZERO: Self;
    const ONE: Self;
    const WORDS: usize;

    // Required methods
    fn inv(self) -> Self;
    fn random(rng: &mut impl RngCore) -> Self;
    fn from_u64(val: u64) -> Self;
    fn to_u32_words(&self) -> Vec<u32>;
    fn from_u32_words(val: &[u32]) -> Self;
    fn is_valid(&self) -> bool;
    fn is_reduced(&self) -> bool;

    // Provided methods
    fn pow(self, exp: usize) -> Self { ... }
    fn valid_or_zero(&self) -> Self { ... }
    fn ensure_valid(&self) -> &Self { ... }
    fn ensure_reduced(&self) -> &Self { ... }
    fn as_u32_slice(elems: &[Self]) -> &[u32] { ... }
    fn as_u32_slice_unchecked(elems: &[Self]) -> &[u32] { ... }
    fn from_u32_slice(u32s: &[u32]) -> &[Self] { ... }
    fn try_from_u32_slice(u32s: &[u32]) -> Result<&[Self], CheckedCastError> { ... }
}

Subfield elements that can be compared, copied, and operated on via multiplication, addition, and subtraction

Required Associated Constants

const INVALID: Self

Invalid, a value that is not a member of the field. This should only be used with the “is_valid” or “unwrap_or_zero” methods.

const ZERO: Self

Zero, the additive identity.

const ONE: Self

One, the multiplicative identity.

const WORDS: usize

How many u32 words are required to hold a single element

Required Methods

fn inv(self) -> Self

Compute the multiplicative inverse of x (or 1 / x in finite field terms).

fn random(rng: &mut impl RngCore) -> Self

Returns a random valid field element.

fn from_u64(val: u64) -> Self

Import a number into the field from the natural numbers.

fn to_u32_words(&self) -> Vec<u32>

Represent a field element as a sequence of u32s

fn from_u32_words(val: &[u32]) -> Self

Interpret a sequence of u32s as a field element

fn is_valid(&self) -> bool

Returns true if this element is not INVALID. Unlike most methods, this may be called on an INVALID element.

fn is_reduced(&self) -> bool

Returns true if this element is represented in reduced/normalized form. Every element has exactly one reduced form. For a field of prime order P, this typically means the underlying data is < P, and for an extension field, this typically means every component is in reduced form.

Provided Methods

fn pow(self, exp: usize) -> Self

Return an element raised to the given power.

fn valid_or_zero(&self) -> Self

Returns 0 if this element is INVALID, else the value of this element. Unlike most methods, this may be called on an INVALID element.

fn ensure_valid(&self) -> &Self

Returns this element, but checks to make sure it’s valid.

fn ensure_reduced(&self) -> &Self

Returns this element, but checks to make sure it’s in reduced form.

fn as_u32_slice(elems: &[Self]) -> &[u32]

Interprets a slice of these elements as u32s. These elements may not be INVALID.

fn as_u32_slice_unchecked(elems: &[Self]) -> &[u32]

Interprets a slice of these elements as u32s. These elements may potentially be INVALID.

fn from_u32_slice(u32s: &[u32]) -> &[Self]

Interprets a slice of u32s as a slice of these elements. These elements may not be INVALID.

fn try_from_u32_slice(u32s: &[u32]) -> Result<&[Self], CheckedCastError>

Interprets a slice of u32s as a slice of these elements. These elements may not be INVALID.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Elem for Elem

const INVALID: Self

const ZERO: Self

const ONE: Self

const WORDS: usize = WORDS

impl Elem for ExtElem

const INVALID: Self

const ZERO: Self

const ONE: Self

const WORDS: usize