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use crate::{SignExtend, ZeroExtend};
pub trait Extend<T>: Sized {
fn extend(self) -> T;
}
impl<T> Extend<T> for T {
#[inline]
fn extend(self) -> Self {
self
}
}
macro_rules! impl_extend {
($T:ty => $( $U:ty ),+ $(,)? => $method:ident) => {
$(
impl Extend<$U> for $T
{
#[inline]
fn extend(self) -> $U {
self.$method()
}
}
impl<'a> Extend<$U> for &'a $T
where
$T: Extend<$U>
{
#[inline]
fn extend(self) -> $U {
<$T as Extend<$U>>::extend(*self)
}
}
)+
};
}
impl_extend! { u8 => u16, u32, u64, u128 => zero_extend }
impl_extend! { u16 => u32, u64, u128 => zero_extend }
impl_extend! { u32 => u64, u128 => zero_extend }
impl_extend! { u64 => u128 => zero_extend }
impl_extend! { i8 => i16, i32, i64, i128 => sign_extend }
impl_extend! { i16 => i32, i64, i128 => sign_extend }
impl_extend! { i32 => i64, i128 => sign_extend }
impl_extend! { i64 => i128 => sign_extend }
pub trait Extended {
#[inline]
fn extended<T>(self) -> T
where
Self: Extend<T>,
{
self.extend()
}
}
impl<T> Extended for T {}
static_assertions::assert_impl_all! { i8 : Extend<i8>, Extend<i16>, Extend<i32>, Extend<i64>, Extend<i128> }
static_assertions::assert_impl_all! { i16 : Extend<i16>, Extend<i32>, Extend<i64>, Extend<i128> }
static_assertions::assert_impl_all! { i32 : Extend<i32>, Extend<i64>, Extend<i128> }
static_assertions::assert_impl_all! { i64 : Extend<i64>, Extend<i128> }
static_assertions::assert_impl_all! { i128 : Extend<i128> }
static_assertions::assert_impl_all! { u8 : Extend<u8>, Extend<u16>, Extend<u32>, Extend<u64>, Extend<u128> }
static_assertions::assert_impl_all! { u16 : Extend<u16>, Extend<u32>, Extend<u64>, Extend<u128> }
static_assertions::assert_impl_all! { u32 : Extend<u32>, Extend<u64>, Extend<u128> }
static_assertions::assert_impl_all! { u64 : Extend<u64>, Extend<u128> }
static_assertions::assert_impl_all! { u128 : Extend<u128> }
#[cfg(test)]
mod tests {
use super::*;
use crate::{SignExtended, ZeroExtended};
#[test]
#[rustfmt::skip]
fn extend_unsigned() {
assert_eq!( u8::extended::< u16>(1), u8::zero_extended::< u16>(1));
assert_eq!( u8::extended::< u32>(1), u8::zero_extended::< u32>(1));
assert_eq!( u8::extended::< u64>(1), u8::zero_extended::< u64>(1));
assert_eq!( u8::extended::<u128>(1), u8::zero_extended::<u128>(1));
assert_eq!(u16::extended::< u32>(1), u16::zero_extended::< u32>(1));
assert_eq!(u16::extended::< u64>(1), u16::zero_extended::< u64>(1));
assert_eq!(u16::extended::<u128>(1), u16::zero_extended::<u128>(1));
assert_eq!(u32::extended::< u64>(1), u32::zero_extended::< u64>(1));
assert_eq!(u32::extended::<u128>(1), u32::zero_extended::<u128>(1));
assert_eq!(u64::extended::<u128>(1), u64::zero_extended::<u128>(1));
}
#[test]
#[rustfmt::skip]
fn extend_unsigned_big() {
assert_eq!( u8::extended::< u8>( u8::MAX), u8::zero_extended::< u8>( u8::MAX));
assert_eq!( u8::extended::< u16>( u8::MAX), u8::zero_extended::< u16>( u8::MAX));
assert_eq!( u8::extended::< u32>( u8::MAX), u8::zero_extended::< u32>( u8::MAX));
assert_eq!( u8::extended::< u64>( u8::MAX), u8::zero_extended::< u64>( u8::MAX));
assert_eq!( u8::extended::<u128>( u8::MAX), u8::zero_extended::<u128>( u8::MAX));
assert_eq!( u16::extended::< u16>( u16::MAX), u16::zero_extended::< u16>( u16::MAX));
assert_eq!( u16::extended::< u32>( u16::MAX), u16::zero_extended::< u32>( u16::MAX));
assert_eq!( u16::extended::< u64>( u16::MAX), u16::zero_extended::< u64>( u16::MAX));
assert_eq!( u16::extended::<u128>( u16::MAX), u16::zero_extended::<u128>( u16::MAX));
assert_eq!( u32::extended::< u32>( u32::MAX), u32::zero_extended::< u32>( u32::MAX));
assert_eq!( u32::extended::< u64>( u32::MAX), u32::zero_extended::< u64>( u32::MAX));
assert_eq!( u32::extended::<u128>( u32::MAX), u32::zero_extended::<u128>( u32::MAX));
assert_eq!( u64::extended::< u64>( u64::MAX), u64::zero_extended::< u64>( u64::MAX));
assert_eq!( u64::extended::<u128>( u64::MAX), u64::zero_extended::<u128>( u64::MAX));
assert_eq!(u128::extended::<u128>(u128::MAX), u128::zero_extended::<u128>(u128::MAX));
}
#[test]
#[rustfmt::skip]
fn extend_signed_positive() {
assert_eq!( i8::extended::< i16>(1), i8::sign_extended::< i16>(1));
assert_eq!( i8::extended::< i32>(1), i8::sign_extended::< i32>(1));
assert_eq!( i8::extended::< i64>(1), i8::sign_extended::< i64>(1));
assert_eq!( i8::extended::<i128>(1), i8::sign_extended::<i128>(1));
assert_eq!(i16::extended::< i32>(1), i16::sign_extended::< i32>(1));
assert_eq!(i16::extended::< i64>(1), i16::sign_extended::< i64>(1));
assert_eq!(i16::extended::<i128>(1), i16::sign_extended::<i128>(1));
assert_eq!(i32::extended::< i64>(1), i32::sign_extended::< i64>(1));
assert_eq!(i32::extended::<i128>(1), i32::sign_extended::<i128>(1));
assert_eq!(i64::extended::<i128>(1), i64::sign_extended::<i128>(1));
}
#[test]
#[rustfmt::skip]
fn extend_signed_negative() {
assert_eq!( i8::extended::< i16>(-1), i8::sign_extended::< i16>(-1));
assert_eq!( i8::extended::< i32>(-1), i8::sign_extended::< i32>(-1));
assert_eq!( i8::extended::< i64>(-1), i8::sign_extended::< i64>(-1));
assert_eq!( i8::extended::<i128>(-1), i8::sign_extended::<i128>(-1));
assert_eq!(i16::extended::< i32>(-1), i16::sign_extended::< i32>(-1));
assert_eq!(i16::extended::< i64>(-1), i16::sign_extended::< i64>(-1));
assert_eq!(i16::extended::<i128>(-1), i16::sign_extended::<i128>(-1));
assert_eq!(i32::extended::< i64>(-1), i32::sign_extended::< i64>(-1));
assert_eq!(i32::extended::<i128>(-1), i32::sign_extended::<i128>(-1));
assert_eq!(i64::extended::<i128>(-1), i64::sign_extended::<i128>(-1));
}
}