Struct Extended80 

pub struct Extended80 {
    pub sign_exponent: u16,
    pub significand: u64,
}

An x87 double-extended value: the ten bytes that carry it.

Held as (exponent_and_sign, significand) rather than as bytes because the padding is not part of the value, and a type that carried the padding would invite a caller to compare two of them and find them different for a reason that is not the number.

Fields

sign_exponent: u16

Sign in bit 15, biased exponent in bits 0..=14.

significand: u64

The significand, with the integer bit explicit in bit 63.

Implementations

impl Extended80

pub const fn from_le_bytes(bytes: [u8; 10]) -> Self

From the ten bytes as x86 stores them, least significant first.

pub const fn to_le_bytes(self) -> [u8; 10]

The ten bytes, least significant first.

pub const fn from_padded_le_bytes(bytes: [u8; 16]) -> Self

From the sixteen bytes a Fast DDS or OpenDDS payload holds on x86-64: the ten that matter, then six the compiler did not write.

The trailing six bytes are ignored. They are padding in the C object and were measured carrying leftover stack — a reader that folded them into the value would decode the same number differently on two runs of the same writer.

pub const fn to_padded_le_bytes(self) -> [u8; 16]

The sixteen bytes with the padding zeroed.

Zeroed rather than left uninitialised because XTypes 1.3 §7.4.1.1 requires trailing padding in a serialised sample to be zero, and because six bytes of process memory on a multicast group is a disclosure whatever the specification says about it.

pub const fn is_sign_negative(self) -> bool

The sign bit.

pub const fn biased_exponent(self) -> u32

The biased exponent.

Trait Implementations

impl Clone for Extended80

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 Extended80

impl Debug for Extended80

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

Formats the value using the given formatter.

impl Eq for Extended80

impl Hash for Extended80

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 PartialEq for Extended80

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Extended80