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use core::{error, fmt};
/// Creating ranged integer result
pub type Result<T = (), E = Error> = core::result::Result<T, E>;
/// Error creating ranged integer
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
pub enum Error {
/// Integer is too large to store in target integer type
PosOverflow,
/// Integer is too small to store in target integer type
NegOverflow,
}
impl error::Error for Error {}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::PosOverflow => write!(
f,
"Integer is too large to store in target integer type",
),
Self::NegOverflow => write!(
f,
"Integer is too small to store in target integer type",
),
}
}
}
impl Error {
/// Clamp out of bounds values into the requested range.
///
/// ```rust
/// # use ranch::{RangedU8, Error};
/// assert_eq!(
/// RangedU8::<1, 3>::with_u8(0).unwrap_or_else(Error::clamp),
/// RangedU8::<1, 3>::new::<1>(),
/// );
/// assert_eq!(
/// RangedU8::<1, 3>::with_u8(4).unwrap_or_else(Error::clamp),
/// RangedU8::<1, 3>::new::<3>(),
/// );
/// ```
#[must_use]
pub const fn clamp<T>(self) -> T
where
T: Clamp,
{
match self {
Self::PosOverflow => T::MAX,
Self::NegOverflow => T::MIN,
}
}
}
pub trait Clamp {
const MIN: Self;
const MAX: Self;
}