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//! `From`-like conversions for [`Limb`].
use super::{Limb, WideWord, Word};
impl Limb {
/// Create a [`Limb`] from a `u8` integer (const-friendly)
// TODO(tarcieri): replace with `const impl From<u8>` when stable
#[must_use]
pub const fn from_u8(n: u8) -> Self {
Limb(n as Word)
}
/// Create a [`Limb`] from a `u16` integer (const-friendly)
// TODO(tarcieri): replace with `const impl From<u16>` when stable
#[must_use]
pub const fn from_u16(n: u16) -> Self {
Limb(n as Word)
}
/// Create a [`Limb`] from a `u32` integer (const-friendly)
// TODO(tarcieri): replace with `const impl From<u32>` when stable
#[must_use]
pub const fn from_u32(n: u32) -> Self {
#[allow(trivial_numeric_casts)]
Limb(n as Word)
}
cpubits::cpubits! {
64 => {
/// Create a [`Limb`] from a `u64` integer (const-friendly)
// TODO(tarcieri): replace with `const impl From<u64>` when stable
#[must_use]
pub const fn from_u64(n: u64) -> Self {
Limb(n)
}
}
}
}
impl From<u8> for Limb {
#[inline]
fn from(n: u8) -> Limb {
Limb(n.into())
}
}
impl From<u16> for Limb {
#[inline]
fn from(n: u16) -> Limb {
Limb(n.into())
}
}
impl From<u32> for Limb {
#[inline]
fn from(n: u32) -> Limb {
Limb(n.into())
}
}
impl From<u64> for Limb {
#[inline]
fn from(n: u64) -> Limb {
cpubits::cpubits! {
32 => {
let overflow = (n >> 32) as u32;
assert!(Limb(overflow).is_zero().to_bool());
Limb(n as u32)
}
64 => {
Limb(n)
}
}
}
}
impl From<Limb> for Word {
#[inline]
fn from(limb: Limb) -> Word {
limb.0
}
}
impl From<Limb> for WideWord {
#[inline]
fn from(limb: Limb) -> WideWord {
limb.0.into()
}
}