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#![no_std]
use core::fmt;
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct U9(u16);
impl U9 {
#[inline]
pub fn from_u16_masked(val: u16) -> Self {
U9(val & 0x1FF)
}
#[inline]
pub fn try_from_u16(val: u16) -> Option<Self> {
match val {
0...0x1FF => Some(U9(val)),
_ => None,
}
}
}
impl fmt::Debug for U9 {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
<u16 as fmt::Debug>::fmt(&self.0, f)
}
}
impl fmt::Display for U9 {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
<u16 as fmt::Display>::fmt(&self.0, f)
}
}
impl From<u8> for U9 {
#[inline]
fn from(val: u8) -> Self {
U9(val.into())
}
}
impl From<U9> for u16 {
#[inline]
fn from(val: U9) -> Self {
val.0.into()
}
}
impl From<U9> for i16 {
#[inline]
fn from(val: U9) -> Self {
val.0 as i16
}
}
impl From<U9> for u32 {
#[inline]
fn from(val: U9) -> Self {
val.0.into()
}
}
impl From<U9> for i32 {
#[inline]
fn from(val: U9) -> Self {
val.0.into()
}
}
impl From<U9> for u64 {
#[inline]
fn from(val: U9) -> Self {
val.0.into()
}
}
impl From<U9> for i64 {
#[inline]
fn from(val: U9) -> Self {
val.0.into()
}
}
#[cfg(test)]
mod tests {
use ::U9;
use ::core::fmt::Debug;
fn check_conversion<T: From<U9> + Eq + Debug>(u9: U9, val: T) {
let u9: T = u9.into();
assert_eq!(u9, val);
}
#[test]
fn conversions() {
check_conversion(0u8.into(), 0u16);
check_conversion(42u8.into(), 42u16);
check_conversion(U9::from_u16_masked(0u16), 0u16);
check_conversion(U9::from_u16_masked(42u16), 42u16);
check_conversion(U9::from_u16_masked(511), 511u16);
check_conversion(U9::from_u16_masked(512), 0u16);
check_conversion(U9::try_from_u16(0u16).unwrap(), 0u16);
check_conversion(U9::try_from_u16(42u16).unwrap(), 42u16);
check_conversion(U9::try_from_u16(511).unwrap(), 511u16);
assert!(U9::try_from_u16(512).is_none());
}
}