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fixed_wide_vectors: move into folder

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2025-01-02 19:53:50 -08:00
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lib/ratio_ops/.gitignore vendored Normal file

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/target

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lib/ratio_ops/Cargo.lock generated Normal file

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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "ratio_ops"
version = "0.1.0"

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lib/ratio_ops/Cargo.toml Normal file

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[package]
name = "ratio_ops"
version = "0.1.0"
edition = "2021"
repository = "https://git.itzana.me/StrafesNET/fixed_wide_vectors"
license = "MIT OR Apache-2.0"
description = "Ratio operations using trait bounds for avoiding division like the plague."
authors = ["Rhys Lloyd <krakow20@gmail.com>"]
[dependencies]

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lib/ratio_ops/LICENSE-APACHE Normal file

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pub mod ratio;
#[cfg(test)]
mod tests;

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lib/ratio_ops/src/ratio.rs Normal file

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#[derive(Clone,Copy,Debug,Hash)]
pub struct Ratio<Num,Den>{
pub num:Num,
pub den:Den,
}
impl<Num,Den> Ratio<Num,Den>{
#[inline(always)]
pub const fn new(num:Num,den:Den)->Self{
Self{num,den}
}
}
/// The actual divide implementation, Div is replaced with a Ratio constructor
pub trait Divide<Rhs=Self>{
type Output;
fn divide(self,rhs:Rhs)->Self::Output;
}
impl<Num,Den> Ratio<Num,Den>
where
Num:Divide<Den>,
{
#[inline]
pub fn divide(self)-><Num as Divide<Den>>::Output{
self.num.divide(self.den)
}
}
//take care to use the ratio methods to avoid nested ratios
impl<LhsNum,LhsDen> Ratio<LhsNum,LhsDen>{
#[inline]
pub fn mul_ratio<RhsNum,RhsDen>(self,rhs:Ratio<RhsNum,RhsDen>)->Ratio<<LhsNum as core::ops::Mul<RhsNum>>::Output,<LhsDen as core::ops::Mul<RhsDen>>::Output>
where
LhsNum:core::ops::Mul<RhsNum>,
LhsDen:core::ops::Mul<RhsDen>,
{
Ratio::new(self.num*rhs.num,self.den*rhs.den)
}
#[inline]
pub fn div_ratio<RhsNum,RhsDen>(self,rhs:Ratio<RhsNum,RhsDen>)->Ratio<<LhsNum as core::ops::Mul<RhsDen>>::Output,<LhsDen as core::ops::Mul<RhsNum>>::Output>
where
LhsNum:core::ops::Mul<RhsDen>,
LhsDen:core::ops::Mul<RhsNum>,
{
Ratio::new(self.num*rhs.den,self.den*rhs.num)
}
}
macro_rules! impl_ratio_method {
($trait:ident, $method:ident, $ratio_method:ident) => {
impl<LhsNum,LhsDen> Ratio<LhsNum,LhsDen>{
#[inline]
pub fn $ratio_method<RhsNum,RhsDen,LhsCrossMul,RhsCrossMul>(self,rhs:Ratio<RhsNum,RhsDen>)->Ratio<<LhsCrossMul as core::ops::$trait<RhsCrossMul>>::Output,<LhsDen as core::ops::Mul<RhsDen>>::Output>
where
LhsNum:core::ops::Mul<RhsDen,Output=LhsCrossMul>,
LhsDen:core::ops::Mul<RhsNum,Output=RhsCrossMul>,
LhsDen:core::ops::Mul<RhsDen>,
LhsDen:Copy,
RhsDen:Copy,
LhsCrossMul:core::ops::$trait<RhsCrossMul>,
{
Ratio::new((self.num*rhs.den).$method(self.den*rhs.num),self.den*rhs.den)
}
}
};
}
impl_ratio_method!(Add,add,add_ratio);
impl_ratio_method!(Sub,sub,sub_ratio);
impl_ratio_method!(Rem,rem,rem_ratio);
/// Comparing two ratios needs to know the parity of the denominators
/// For signed integers this can be implemented with is_negative()
pub trait Parity{
fn parity(&self)->bool;
}
macro_rules! impl_parity_unsigned{
($($type:ty),*)=>{
$(
impl Parity for $type{
fn parity(&self)->bool{
false
}
}
)*
};
}
macro_rules! impl_parity_signed{
($($type:ty),*)=>{
$(
impl Parity for $type{
fn parity(&self)->bool{
self.is_negative()
}
}
)*
};
}
macro_rules! impl_parity_float{
($($type:ty),*)=>{
$(
impl Parity for $type{
fn parity(&self)->bool{
self.is_sign_negative()
}
}
)*
};
}
impl_parity_unsigned!(u8,u16,u32,u64,u128,usize);
impl_parity_signed!(i8,i16,i32,i64,i128,isize);
impl_parity_float!(f32,f64);
macro_rules! impl_ratio_ord_method{
($method:ident, $ratio_method:ident, $output:ty)=>{
impl<LhsNum,LhsDen:Parity> Ratio<LhsNum,LhsDen>{
#[inline]
pub fn $ratio_method<RhsNum,RhsDen:Parity,T>(self,rhs:Ratio<RhsNum,RhsDen>)->$output
where
LhsNum:core::ops::Mul<RhsDen,Output=T>,
LhsDen:core::ops::Mul<RhsNum,Output=T>,
T:Ord,
{
match self.den.parity()^rhs.den.parity(){
true=>(self.den*rhs.num).$method(&(self.num*rhs.den)),
false=>(self.num*rhs.den).$method(&(self.den*rhs.num)),
}
}
}
}
}
//PartialEq
impl_ratio_ord_method!(eq,eq_ratio,bool);
//PartialOrd
impl_ratio_ord_method!(lt,lt_ratio,bool);
impl_ratio_ord_method!(gt,gt_ratio,bool);
impl_ratio_ord_method!(le,le_ratio,bool);
impl_ratio_ord_method!(ge,ge_ratio,bool);
impl_ratio_ord_method!(partial_cmp,partial_cmp_ratio,Option<core::cmp::Ordering>);
//Ord
impl_ratio_ord_method!(cmp,cmp_ratio,core::cmp::Ordering);
/* generic rhs mul is not possible!
impl<Lhs,RhsNum,RhsDen> core::ops::Mul<Ratio<RhsNum,RhsDen>> for Lhs
where
Lhs:core::ops::Mul<RhsNum>,
{
type Output=Ratio<<Lhs as core::ops::Mul<RhsNum>>::Output,RhsDen>;
#[inline]
fn mul(self,rhs:Ratio<RhsNum,RhsDen>)->Self::Output{
Ratio::new(self*rhs.num,rhs.den)
}
}
*/
//operators
impl<LhsNum,LhsDen> core::ops::Neg for Ratio<LhsNum,LhsDen>
where
LhsNum:core::ops::Neg,
{
type Output=Ratio<<LhsNum as core::ops::Neg>::Output,LhsDen>;
#[inline]
fn neg(self)->Self::Output{
Ratio::new(-self.num,self.den)
}
}
impl<LhsNum,LhsDen,Rhs> core::ops::Mul<Rhs> for Ratio<LhsNum,LhsDen>
where
LhsNum:core::ops::Mul<Rhs>,
{
type Output=Ratio<<LhsNum as core::ops::Mul<Rhs>>::Output,LhsDen>;
#[inline]
fn mul(self,rhs:Rhs)->Self::Output{
Ratio::new(self.num*rhs,self.den)
}
}
impl<LhsNum,LhsDen,Rhs> core::ops::Div<Rhs> for Ratio<LhsNum,LhsDen>
where
LhsDen:core::ops::Mul<Rhs>,
{
type Output=Ratio<LhsNum,<LhsDen as core::ops::Mul<Rhs>>::Output>;
#[inline]
fn div(self,rhs:Rhs)->Self::Output{
Ratio::new(self.num,self.den*rhs)
}
}
macro_rules! impl_ratio_operator {
($trait:ident, $method:ident) => {
impl<LhsNum,LhsDen,Rhs,Intermediate> core::ops::$trait<Rhs> for Ratio<LhsNum,LhsDen>
where
LhsNum:core::ops::$trait<Intermediate>,
LhsDen:Copy,
Rhs:core::ops::Mul<LhsDen,Output=Intermediate>,
{
type Output=Ratio<<LhsNum as core::ops::$trait<Intermediate>>::Output,LhsDen>;
#[inline]
fn $method(self,rhs:Rhs)->Self::Output{
Ratio::new(self.num.$method(rhs*self.den),self.den)
}
}
};
}
impl_ratio_operator!(Add,add);
impl_ratio_operator!(Sub,sub);
impl_ratio_operator!(Rem,rem);
//assign operators
impl<LhsNum,LhsDen,Rhs> core::ops::MulAssign<Rhs> for Ratio<LhsNum,LhsDen>
where
LhsNum:core::ops::MulAssign<Rhs>,
{
#[inline]
fn mul_assign(&mut self,rhs:Rhs){
self.num*=rhs;
}
}
impl<LhsNum,LhsDen,Rhs> core::ops::DivAssign<Rhs> for Ratio<LhsNum,LhsDen>
where
LhsDen:core::ops::MulAssign<Rhs>,
{
#[inline]
fn div_assign(&mut self,rhs:Rhs){
self.den*=rhs;
}
}
macro_rules! impl_ratio_assign_operator {
($trait:ident, $method:ident) => {
impl<LhsNum,LhsDen,Rhs> core::ops::$trait<Rhs> for Ratio<LhsNum,LhsDen>
where
LhsNum:core::ops::$trait,
LhsDen:Copy,
Rhs:core::ops::Mul<LhsDen,Output=LhsNum>,
{
#[inline]
fn $method(&mut self,rhs:Rhs){
self.num.$method(rhs*self.den)
}
}
};
}
impl_ratio_assign_operator!(AddAssign,add_assign);
impl_ratio_assign_operator!(SubAssign,sub_assign);
impl_ratio_assign_operator!(RemAssign,rem_assign);
// Only implement PartialEq<Self>
// Rust's operators aren't actually that good
impl<LhsNum,LhsDen,RhsNum,RhsDen,T,U> PartialEq<Ratio<RhsNum,RhsDen>> for Ratio<LhsNum,LhsDen>
where
LhsNum:Copy,
LhsDen:Copy,
RhsNum:Copy,
RhsDen:Copy,
LhsNum:core::ops::Mul<RhsDen,Output=T>,
RhsNum:core::ops::Mul<LhsDen,Output=U>,
T:PartialEq<U>,
{
#[inline]
fn eq(&self,other:&Ratio<RhsNum,RhsDen>)->bool{
(self.num*other.den).eq(&(other.num*self.den))
}
}
impl<Num,Den> Eq for Ratio<Num,Den> where Self:PartialEq{}
impl<LhsNum,LhsDen,RhsNum,RhsDen,T,U> PartialOrd<Ratio<RhsNum,RhsDen>> for Ratio<LhsNum,LhsDen>
where
LhsNum:Copy,
LhsDen:Copy,
RhsNum:Copy,
RhsDen:Copy,
LhsNum:core::ops::Mul<RhsDen,Output=T>,
RhsNum:core::ops::Mul<LhsDen,Output=U>,
T:PartialOrd<U>,
{
#[inline]
fn partial_cmp(&self,other:&Ratio<RhsNum,RhsDen>)->Option<core::cmp::Ordering>{
(self.num*other.den).partial_cmp(&(other.num*self.den))
}
}
impl<Num,Den,T> Ord for Ratio<Num,Den>
where
Num:Copy,
Den:Copy,
Num:core::ops::Mul<Den,Output=T>,
T:Ord,
{
#[inline]
fn cmp(&self,other:&Self)->std::cmp::Ordering{
(self.num*other.den).cmp(&(other.num*self.den))
}
}

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use crate::ratio::Ratio;
macro_rules! test_op{
($ratio_op:ident,$op:ident,$a:expr,$b:expr,$c:expr,$d:expr)=>{
assert_eq!(
Ratio::new($a,$b).$ratio_op(Ratio::new($c,$d)),
(($a as f32)/($b as f32)).$op(&(($c as f32)/($d as f32)))
);
};
}
macro_rules! test_many_ops{
($ratio_op:ident,$op:ident)=>{
test_op!($ratio_op,$op,1,2,3,4);
test_op!($ratio_op,$op,1,2,-3,4);
test_op!($ratio_op,$op,-1,2,-3,4);
test_op!($ratio_op,$op,-1,-2,-3,4);
test_op!($ratio_op,$op,2,1,6,3);
test_op!($ratio_op,$op,-2,1,6,3);
test_op!($ratio_op,$op,2,-1,-6,3);
test_op!($ratio_op,$op,2,1,6,-3);
};
}
#[test]
fn test_lt(){
test_many_ops!(lt_ratio,lt);
}
#[test]
fn test_gt(){
test_many_ops!(gt_ratio,gt);
}
#[test]
fn test_le(){
test_many_ops!(le_ratio,le);
}
#[test]
fn test_ge(){
test_many_ops!(ge_ratio,ge);
}
#[test]
fn test_eq(){
test_many_ops!(eq_ratio,eq);
}
#[test]
fn test_partial_cmp(){
test_many_ops!(partial_cmp_ratio,partial_cmp);
}
// #[test]
// fn test_cmp(){
// test_many_ops!(cmp_ratio,cmp);
// }