Ratio Parity trait
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@ -408,7 +408,12 @@ impl<const LHS_N:usize,const LHS_F:usize,const RHS_N:usize,const RHS_F:usize> co
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ratio_ops::ratio::Ratio::new(self,other)
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}
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}
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#[cfg(feature="deferred-division")]
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impl<const N:usize,const F:usize> ratio_ops::ratio::Parity for Fixed<N,F>{
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fn parity(&self)->bool{
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self.is_negative()
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}
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}
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macro_rules! impl_shift_operator {
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( $struct: ident, $trait: ident, $method: ident, $output: ty ) => {
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impl<const N:usize,const F:usize> core::ops::$trait<u32> for $struct<N,F>{
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@ -68,17 +68,63 @@ impl_ratio_method!(Add,add,add_ratio);
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impl_ratio_method!(Sub,sub,sub_ratio);
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impl_ratio_method!(Rem,rem,rem_ratio);
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macro_rules! impl_ratio_ord_method {
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($method:ident, $ratio_method:ident, $output:ty) => {
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impl<LhsNum,LhsDen> Ratio<LhsNum,LhsDen>{
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/// Comparing two ratios needs to know the parity of the denominators
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/// For signed integers this can be implemented with is_negative()
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pub trait Parity{
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fn parity(&self)->bool;
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}
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macro_rules! impl_parity_unsigned{
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($($type:ty),*)=>{
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$(
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impl Parity for $type{
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fn parity(&self)->bool{
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false
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}
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}
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)*
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};
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}
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macro_rules! impl_parity_signed{
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($($type:ty),*)=>{
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$(
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impl Parity for $type{
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fn parity(&self)->bool{
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self.is_negative()
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}
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}
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)*
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};
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}
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macro_rules! impl_parity_float{
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($($type:ty),*)=>{
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$(
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impl Parity for $type{
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fn parity(&self)->bool{
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self.is_sign_negative()
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}
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}
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)*
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};
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}
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impl_parity_unsigned!(u8,u16,u32,u64,u128,usize);
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impl_parity_signed!(i8,i16,i32,i64,i128,isize);
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impl_parity_float!(f32,f64);
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macro_rules! impl_ratio_ord_method{
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($method:ident, $ratio_method:ident, $output:ty)=>{
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impl<LhsNum,LhsDen:Parity> Ratio<LhsNum,LhsDen>{
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#[inline]
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pub fn $ratio_method<RhsNum,RhsDen,T>(self,rhs:Ratio<RhsNum,RhsDen>)->$output
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pub fn $ratio_method<RhsNum,RhsDen:Parity,T>(self,rhs:Ratio<RhsNum,RhsDen>)->$output
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where
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LhsNum:core::ops::Mul<RhsDen,Output=T>,
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LhsDen:core::ops::Mul<RhsNum,Output=T>,
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T:Ord,
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{
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(self.num*rhs.den).$method(&(self.den*rhs.num))
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match self.den.parity()^rhs.den.parity(){
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true=>(self.den*rhs.num).$method(&(self.num*rhs.den)),
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false=>(self.num*rhs.den).$method(&(self.den*rhs.num)),
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}
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}
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}
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}
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