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pub trait MissingData<T>: Default
where
T: PartialEq + Copy,
{
const MISSING: T;
}
#[derive(Clone, Copy, Debug)]
pub struct OptionVal<T: PartialEq + Copy + MissingData<T>> {
value: T,
}
impl<T> OptionVal<T>
where
T: PartialEq + Copy + MissingData<T>,
{
#[inline]
pub fn as_option(self) -> Option<T> {
self.into()
}
#[inline]
pub fn unwrap(self) -> T {
self.value
}
}
impl<T> Into<Option<T>> for OptionVal<T>
where
T: PartialEq + Copy + MissingData<T>,
{
#[inline]
fn into(self) -> Option<T> {
if self.value == T::MISSING {
None
} else {
Some(self.value)
}
}
}
impl<T> Default for OptionVal<T>
where
T: PartialEq + Copy + MissingData<T>,
{
#[inline]
fn default() -> Self {
OptionVal::from(T::MISSING)
}
}
impl<T> From<Option<T>> for OptionVal<T>
where
T: PartialEq + Copy + MissingData<T>,
{
#[inline]
fn from(src: Option<T>) -> OptionVal<T> {
if let Some(val) = src {
OptionVal::from(val)
} else {
OptionVal::from(T::MISSING)
}
}
}
impl<T> From<T> for OptionVal<T>
where
T: PartialEq + Copy + MissingData<T>,
{
#[inline]
fn from(src: T) -> OptionVal<T> {
OptionVal { value: src }
}
}
impl MissingData<f64> for f64 {
const MISSING: f64 = -9999.0;
}
impl MissingData<i32> for i32 {
const MISSING: i32 = -9999;
}