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use std::cmp;
use std::fmt;
use std::sync::atomic::{AtomicU64, Ordering};
/// Number represents either an integral or a floating point value. It
/// needs to be accompanied with a source of NumberKind that describes
/// the actual type of the value stored within Number.
#[derive(Clone, Debug, Default)]
pub struct Number(u64);
impl Number {
/// Create an atomic version of the current number
pub fn to_atomic(&self) -> AtomicNumber {
AtomicNumber(AtomicU64::new(self.0))
}
/// Compares this number to the given other number. Both should be of the same kind.
pub fn partial_cmp(&self, number_kind: &NumberKind, other: &Number) -> Option<cmp::Ordering> {
match number_kind {
NumberKind::I64 => (self.0 as i64).partial_cmp(&(other.0 as i64)),
NumberKind::F64 => {
let current = u64_to_f64(self.0);
let other = u64_to_f64(other.0);
current.partial_cmp(&other)
}
NumberKind::U64 => self.0.partial_cmp(&other.0),
}
}
/// Casts the number to `i64`. May result in data/precision loss.
pub fn to_i64(&self, number_kind: &NumberKind) -> i64 {
match number_kind {
NumberKind::F64 => u64_to_f64(self.0) as i64,
NumberKind::U64 | NumberKind::I64 => self.0 as i64,
}
}
/// Casts the number to `f64`. May result in data/precision loss.
pub fn to_f64(&self, number_kind: &NumberKind) -> f64 {
match number_kind {
NumberKind::I64 => (self.0 as i64) as f64,
NumberKind::F64 => u64_to_f64(self.0),
NumberKind::U64 => self.0 as f64,
}
}
/// Casts the number to `u64`. May result in data/precision loss.
pub fn to_u64(&self, number_kind: &NumberKind) -> u64 {
match number_kind {
NumberKind::F64 => u64_to_f64(self.0) as u64,
NumberKind::U64 | NumberKind::I64 => self.0,
}
}
/// Checks if this value ia an f64 nan value. Do not use on non-f64 values.
pub fn is_nan(&self) -> bool {
u64_to_f64(self.0).is_nan()
}
/// `true` if the actual value is less than zero.
pub fn is_negative(&self, number_kind: &NumberKind) -> bool {
match number_kind {
NumberKind::I64 => (self.0 as i64).is_negative(),
NumberKind::F64 => u64_to_f64(self.0).is_sign_negative(),
NumberKind::U64 => false,
}
}
/// Return loaded data for debugging purposes
pub fn to_debug(&self, kind: &NumberKind) -> Box<dyn fmt::Debug> {
match kind {
NumberKind::I64 => Box::new(self.0 as i64),
NumberKind::F64 => Box::new(u64_to_f64(self.0)),
NumberKind::U64 => Box::new(self.0),
}
}
}
/// An atomic version of `Number`
#[derive(Debug, Default)]
pub struct AtomicNumber(AtomicU64);
impl AtomicNumber {
/// Stores a `Number` into the atomic number.
pub fn store(&self, val: &Number) {
self.0.store(val.0, Ordering::Relaxed)
}
/// Adds to the current number. Both numbers must be of the same kind.
///
/// This operation wraps around on overflow for `u64` and `i64` types and is
/// `inf` for `f64`.
pub fn fetch_add(&self, number_kind: &NumberKind, val: &Number) {
match number_kind {
NumberKind::I64 => {
let mut old = self.0.load(Ordering::Acquire);
loop {
let new = (old as i64).wrapping_add(val.0 as i64) as u64;
match self.0.compare_exchange_weak(
old,
new,
Ordering::AcqRel,
Ordering::Acquire,
) {
Ok(_) => break,
Err(x) => old = x,
};
}
}
NumberKind::F64 => {
let mut old = self.0.load(Ordering::Acquire);
loop {
let new = u64_to_f64(old) + u64_to_f64(val.0);
match self.0.compare_exchange_weak(
old,
f64_to_u64(new),
Ordering::AcqRel,
Ordering::Acquire,
) {
Ok(_) => break,
Err(x) => old = x,
};
}
}
NumberKind::U64 => {
self.0.fetch_add(val.0, Ordering::AcqRel);
}
}
}
/// Subtracts from the current number. Both numbers must be of the same kind.
///
/// This operation wraps around on overflow for `u64` and `i64` types and is
/// `-inf` for `f64`.
pub fn fetch_sub(&self, number_kind: &NumberKind, val: &Number) {
match number_kind {
NumberKind::I64 => {
let mut old = self.0.load(Ordering::Acquire);
loop {
let new = (old as i64).wrapping_sub(val.0 as i64) as u64;
match self.0.compare_exchange_weak(
old,
new,
Ordering::AcqRel,
Ordering::Relaxed,
) {
Ok(_) => break,
Err(x) => old = x,
};
}
}
NumberKind::F64 => {
let mut old = self.0.load(Ordering::Acquire);
loop {
let new = u64_to_f64(old) - u64_to_f64(val.0);
match self.0.compare_exchange_weak(
old,
f64_to_u64(new),
Ordering::AcqRel,
Ordering::Acquire,
) {
Ok(_) => break,
Err(x) => old = x,
};
}
}
NumberKind::U64 => {
self.0.fetch_sub(val.0, Ordering::AcqRel);
}
}
}
/// Loads the current `Number`.
pub fn load(&self) -> Number {
Number(self.0.load(Ordering::Relaxed))
}
}
impl Clone for AtomicNumber {
fn clone(&self) -> Self {
AtomicNumber(AtomicU64::new(self.0.load(Ordering::Relaxed)))
}
}
impl From<f64> for Number {
fn from(f: f64) -> Self {
Number(f64_to_u64(f))
}
}
impl From<i64> for Number {
fn from(i: i64) -> Self {
Number(i as u64)
}
}
impl From<u64> for Number {
fn from(u: u64) -> Self {
Number(u)
}
}
/// A descriptor for the encoded data type of a `Number`
#[derive(Clone, Debug, PartialEq, Hash)]
pub enum NumberKind {
/// A Number that stores `i64` values.
I64,
/// A Number that stores `f64` values.
F64,
/// A Number that stores `u64` values.
U64,
}
impl NumberKind {
/// Returns the zero value for each kind
pub fn zero(&self) -> Number {
match self {
NumberKind::I64 => 0i64.into(),
NumberKind::F64 => 0f64.into(),
NumberKind::U64 => 0u64.into(),
}
}
/// Returns the max value for each kind
pub fn max(&self) -> Number {
match self {
NumberKind::I64 => std::i64::MAX.into(),
NumberKind::F64 => std::f64::MAX.into(),
NumberKind::U64 => std::u64::MAX.into(),
}
}
/// Returns the min value for each kind
pub fn min(&self) -> Number {
match self {
NumberKind::I64 => std::i64::MIN.into(),
NumberKind::F64 => std::f64::MIN.into(),
NumberKind::U64 => std::u64::MIN.into(),
}
}
}
#[inline]
fn u64_to_f64(val: u64) -> f64 {
f64::from_bits(val)
}
#[inline]
fn f64_to_u64(val: f64) -> u64 {
f64::to_bits(val)
}