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use std::ops::{Div, DivAssign, Mul, MulAssign}; use crate::{Rational128, Rational16, Rational32, Rational64, Rational8}; use crate::rational::small::ops::building_blocks::{gcd128, gcd16, gcd32, gcd64, gcd8}; use crate::Sign; macro_rules! rational { ($name:ident, $uty:ty, $mul_name:ident, $gcd_name:ident) => { #[inline] fn $mul_name(left_numerator: &mut $uty, left_denominator: &mut $uty, right: $uty) { debug_assert_ne!(right, 0); if right != 1 { if *left_denominator != 1 { let gcd = $gcd_name(*left_denominator, right); *left_numerator *= right / gcd; *left_denominator /= gcd; } else { *left_numerator *= right; } } } impl Mul<&$uty> for $name { type Output = Self; #[inline] #[must_use] fn mul(mut self, rhs: &$uty) -> Self::Output { MulAssign::mul_assign(&mut self, rhs); self } } impl Mul<$uty> for $name { type Output = Self; #[inline] #[must_use] fn mul(mut self, rhs: $uty) -> Self::Output { MulAssign::mul_assign(&mut self, rhs); self } } impl MulAssign<&$uty> for $name { #[inline] fn mul_assign(&mut self, rhs: &$uty) { MulAssign::mul_assign(self, *rhs); } } impl MulAssign<$uty> for $name { #[inline] fn mul_assign(&mut self, rhs: $uty) { if rhs != 0 { match self.sign { Sign::Positive | Sign::Negative => { $mul_name(&mut self.numerator, &mut self.denominator, rhs); } Sign::Zero => {} } } else { <Self as num_traits::Zero>::set_zero(self); } } } impl Div<&$uty> for $name { type Output = Self; #[inline] #[must_use] fn div(mut self, rhs: &$uty) -> Self::Output { DivAssign::div_assign(&mut self, rhs); self } } impl Div<$uty> for $name { type Output = Self; #[inline] #[must_use] fn div(mut self, rhs: $uty) -> Self::Output { DivAssign::div_assign(&mut self, rhs); self } } impl DivAssign<&$uty> for $name { #[inline] fn div_assign(&mut self, rhs: &$uty) { DivAssign::div_assign(self, *rhs); } } impl DivAssign<$uty> for $name { #[inline] fn div_assign(&mut self, rhs: $uty) { if rhs != 0 { match self.sign { Sign::Positive | Sign::Negative => { $mul_name(&mut self.denominator, &mut self.numerator, rhs); } Sign::Zero => {} } } else { panic!("attempt to divide by zero"); } } } } } rational!(Rational8, u8, mul8, gcd8); rational!(Rational16, u16, mul16, gcd16); rational!(Rational32, u32, mul32, gcd32); rational!(Rational64, u64, mul64, gcd64); rational!(Rational128, u128, mul128, gcd128); #[cfg(test)] mod test { use crate::R16; #[test] fn test_mul() { let mut x = R16!(1); x /= &19_u16; assert_eq!(x, R16!(1, 19)); assert_eq!(R16!(1) / &19_u16, R16!(1, 19)); assert_eq!(R16!(1) * &19_u16, R16!(19)); assert_eq!(R16!(3) * &19, R16!(19 * 3)); assert_eq!(R16!(3) / &19, R16!(3, 19)); assert_eq!(R16!(3) * &6, R16!(3 * 6)); assert_eq!(R16!(3) / &6, R16!(3, 6)); assert_eq!(R16!(3) * 0, R16!(0)); assert_eq!(R16!(3) / &6, R16!(3, 6)); } #[test] #[should_panic] #[allow(unused_must_use)] fn test_mul_by_zero() { R16!(3) / &0; } }