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use std::error::Error as ErrorTrait;
use std::ops::RangeBounds;
use std::fmt;
use bounds::{Bounds, copy_bound};
pub trait Check<R: RangeBounds<Self>>: Sized + PartialOrd + Copy {
fn check_range(self, range: R) -> Result<Self, OutOfRangeError<Self>>;
}
impl<T, R> Check<R> for T
where R: RangeBounds<T>,
T: PartialOrd + Copy,
{
fn check_range(self, range: R) -> Result<Self, OutOfRangeError<Self>> {
if range.contains(&self) {
Ok(self)
}
else {
let bounds = Bounds {
lower: copy_bound(range.start_bound()),
upper: copy_bound(range.end_bound()),
};
Err(OutOfRangeError { allowed_range: bounds, outside_value: self })
}
}
}
#[derive(PartialEq, Debug, Clone)]
pub struct OutOfRangeError<T> {
pub allowed_range: Bounds<T>,
pub outside_value: T,
}
impl<T: fmt::Debug> ErrorTrait for OutOfRangeError<T> {
fn description(&self) -> &str {
"value outside of range"
}
}
impl<T: fmt::Debug> fmt::Display for OutOfRangeError<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "value ({:?}) outside of range ({})",
self.outside_value, self.allowed_range)
}
}
impl<T> OutOfRangeError<T> {
pub fn generify<U: From<T>>(self) -> OutOfRangeError<U> {
OutOfRangeError {
allowed_range: self.allowed_range.convert(),
outside_value: self.outside_value.into(),
}
}
}