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Ensure infalliability of conversions, avoid closures.

This commit is contained in:
Clar Charr 2018-02-27 14:06:46 -05:00
parent aca8dc8149
commit 79b557f040
1 changed files with 66 additions and 52 deletions
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118
src/pow.rs
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@ -21,19 +21,22 @@ pub trait Pow<RHS> {
macro_rules! pow_impl { macro_rules! pow_impl {
($t:ty) => { ($t:ty) => {
pow_impl!($t, u8); pow_impl!($t, u8);
pow_impl!($t, u16);
pow_impl!($t, u32);
pow_impl!($t, usize); pow_impl!($t, usize);
// FIXME: these should be possible
// pow_impl!($t, u16);
// pow_impl!($t, u32);
// pow_impl!($t, u64);
}; };
($t:ty, $rhs:ty) => { ($t:ty, $rhs:ty) => {
pow_impl!($t, $rhs, |x, p| pow(x, p as usize)); pow_impl!($t, $rhs, usize, pow);
}; };
($t:ty, $rhs:ty, $method:expr) => { ($t:ty, $rhs:ty, $desired_rhs:ty, $method:expr) => {
impl Pow<$rhs> for $t { impl Pow<$rhs> for $t {
type Output = $t; type Output = $t;
#[inline] #[inline]
fn pow(self, rhs: $rhs) -> $t { fn pow(self, rhs: $rhs) -> $t {
($method)(self, rhs) ($method)(self, <$desired_rhs>::from(rhs))
} }
} }
@ -41,7 +44,7 @@ macro_rules! pow_impl {
type Output = $t; type Output = $t;
#[inline] #[inline]
fn pow(self, rhs: &'a $rhs) -> $t { fn pow(self, rhs: &'a $rhs) -> $t {
($method)(self, *rhs) ($method)(self, <$desired_rhs>::from(*rhs))
} }
} }
@ -49,7 +52,7 @@ macro_rules! pow_impl {
type Output = $t; type Output = $t;
#[inline] #[inline]
fn pow(self, rhs: $rhs) -> $t { fn pow(self, rhs: $rhs) -> $t {
($method)(*self, rhs) ($method)(*self, <$desired_rhs>::from(rhs))
} }
} }
@ -57,51 +60,51 @@ macro_rules! pow_impl {
type Output = $t; type Output = $t;
#[inline] #[inline]
fn pow(self, rhs: &'a $rhs) -> $t { fn pow(self, rhs: &'a $rhs) -> $t {
($method)(*self, *rhs) ($method)(*self, <$desired_rhs>::from(*rhs))
} }
} }
}; };
} }
pow_impl!(u8, u8, |x: u8, p| x.pow(p as u32)); pow_impl!(u8, u8, u32, u8::pow);
pow_impl!(u8, u16, |x: u8, p| x.pow(p as u32)); pow_impl!(u8, u16, u32, u8::pow);
pow_impl!(u8, u32, u8::pow); pow_impl!(u8, u32, u32, u8::pow);
pow_impl!(u8, usize); pow_impl!(u8, usize);
pow_impl!(i8, u8, |x: i8, p| x.pow(p as u32)); pow_impl!(i8, u8, u32, i8::pow);
pow_impl!(i8, u16, |x: i8, p| x.pow(p as u32)); pow_impl!(i8, u16, u32, i8::pow);
pow_impl!(i8, u32, i8::pow); pow_impl!(i8, u32, u32, i8::pow);
pow_impl!(i8, usize); pow_impl!(i8, usize);
pow_impl!(u16, u8, |x: u16, p| x.pow(p as u32)); pow_impl!(u16, u8, u32, u16::pow);
pow_impl!(u16, u16, |x: u16, p| x.pow(p as u32)); pow_impl!(u16, u16, u32, u16::pow);
pow_impl!(u16, u32, u16::pow); pow_impl!(u16, u32, u32, u16::pow);
pow_impl!(u16, usize); pow_impl!(u16, usize);
pow_impl!(i16, u8, |x: i16, p| x.pow(p as u32)); pow_impl!(i16, u8, u32, i16::pow);
pow_impl!(i16, u16, |x: i16, p| x.pow(p as u32)); pow_impl!(i16, u16, u32, i16::pow);
pow_impl!(i16, u32, i16::pow); pow_impl!(i16, u32, u32, i16::pow);
pow_impl!(i16, usize); pow_impl!(i16, usize);
pow_impl!(u32, u8, |x: u32, p| x.pow(p as u32)); pow_impl!(u32, u8, u32, u32::pow);
pow_impl!(u32, u16, |x: u32, p| x.pow(p as u32)); pow_impl!(u32, u16, u32, u32::pow);
pow_impl!(u32, u32, u32::pow); pow_impl!(u32, u32, u32, u32::pow);
pow_impl!(u32, usize); pow_impl!(u32, usize);
pow_impl!(i32, u8, |x: i32, p| x.pow(p as u32)); pow_impl!(i32, u8, u32, i32::pow);
pow_impl!(i32, u16, |x: i32, p| x.pow(p as u32)); pow_impl!(i32, u16, u32, i32::pow);
pow_impl!(i32, u32, i32::pow); pow_impl!(i32, u32, u32, i32::pow);
pow_impl!(i32, usize); pow_impl!(i32, usize);
pow_impl!(u64, u8, |x: u64, p| x.pow(p as u32)); pow_impl!(u64, u8, u32, u64::pow);
pow_impl!(u64, u16, |x: u64, p| x.pow(p as u32)); pow_impl!(u64, u16, u32, u64::pow);
pow_impl!(u64, u32, u64::pow); pow_impl!(u64, u32, u32, u64::pow);
pow_impl!(u64, usize); pow_impl!(u64, usize);
pow_impl!(i64, u8, |x: i64, p| x.pow(p as u32)); pow_impl!(i64, u8, u32, i64::pow);
pow_impl!(i64, u16, |x: i64, p| x.pow(p as u32)); pow_impl!(i64, u16, u32, i64::pow);
pow_impl!(i64, u32, i64::pow); pow_impl!(i64, u32, u32, i64::pow);
pow_impl!(i64, usize); pow_impl!(i64, usize);
pow_impl!(usize, u8, |x: usize, p| x.pow(p as u32)); pow_impl!(usize, u8, u32, usize::pow);
pow_impl!(usize, u16, |x: usize, p| x.pow(p as u32)); pow_impl!(usize, u16, u32, usize::pow);
pow_impl!(usize, u32, usize::pow); pow_impl!(usize, u32, u32, usize::pow);
pow_impl!(usize, usize); pow_impl!(usize, usize);
pow_impl!(isize, u8, |x: isize, p| x.pow(p as u32)); pow_impl!(isize, u8, u32, isize::pow);
pow_impl!(isize, u16, |x: isize, p| x.pow(p as u32)); pow_impl!(isize, u16, u32, isize::pow);
pow_impl!(isize, u32, isize::pow); pow_impl!(isize, u32, u32, isize::pow);
pow_impl!(isize, usize); pow_impl!(isize, usize);
pow_impl!(Wrapping<u8>); pow_impl!(Wrapping<u8>);
pow_impl!(Wrapping<i8>); pow_impl!(Wrapping<i8>);
@ -114,26 +117,37 @@ pow_impl!(Wrapping<i64>);
pow_impl!(Wrapping<usize>); pow_impl!(Wrapping<usize>);
pow_impl!(Wrapping<isize>); pow_impl!(Wrapping<isize>);
// FIXME: these should be possible
// pow_impl!(u8, u64);
// pow_impl!(i16, u64);
// pow_impl!(i8, u64);
// pow_impl!(u16, u64);
// pow_impl!(u32, u64);
// pow_impl!(i32, u64);
// pow_impl!(u64, u64);
// pow_impl!(i64, u64);
// pow_impl!(usize, u64);
// pow_impl!(isize, u64);
#[cfg(feature = "std")] #[cfg(feature = "std")]
mod float_impls { mod float_impls {
use super::Pow; use super::Pow;
pow_impl!(f32, i8, |x: f32, p| x.powi(p as i32)); pow_impl!(f32, i8, i32, f32::powi);
pow_impl!(f32, u8, |x: f32, p| x.powi(p as i32)); pow_impl!(f32, u8, i32, f32::powi);
pow_impl!(f32, i16, |x: f32, p| x.powi(p as i32)); pow_impl!(f32, i16, i32, f32::powi);
pow_impl!(f32, u16, |x: f32, p| x.powi(p as i32)); pow_impl!(f32, u16, i32, f32::powi);
pow_impl!(f32, i32, f32::powi); pow_impl!(f32, i32, i32, f32::powi);
pow_impl!(f64, i8, |x: f64, p| x.powi(p as i32)); pow_impl!(f64, i8, i32, f64::powi);
pow_impl!(f64, u8, |x: f64, p| x.powi(p as i32)); pow_impl!(f64, u8, i32, f64::powi);
pow_impl!(f64, i16, |x: f64, p| x.powi(p as i32)); pow_impl!(f64, i16, i32, f64::powi);
pow_impl!(f64, u16, |x: f64, p| x.powi(p as i32)); pow_impl!(f64, u16, i32, f64::powi);
pow_impl!(f64, i32, f64::powi); pow_impl!(f64, i32, i32, f64::powi);
pow_impl!(f32, f32, f32::powf); pow_impl!(f32, f32, f32, f32::powf);
pow_impl!(f64, f32, |x: f64, p| x.powf(p as f64)); pow_impl!(f64, f32, f64, f64::powf);
pow_impl!(f64, f64, f64::powf); pow_impl!(f64, f64, f64, f64::powf);
} }
/// Raises a value to the power of exp, using exponentiation by squaring. /// Raises a value to the power of exp, using exponentiation by squaring.
/// ///
/// # Example /// # Example