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January 5, 2024 16:42
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use std::fmt::Debug; | |
/// # Partial Result | |
/// | |
/// Result type for operations which can fail, but still return some data | |
/// | |
/// Conceptionally, this is a (D, Option<E>) | |
/// | |
/// The design of this type is intended to force handling of errors, but also | |
/// grant access to partial results in case of errors | |
pub enum PartialResult<D, E> { | |
Ok(D), | |
Err(D, E), | |
} | |
impl<D, E> PartialResult<D, E> { | |
/// Consume self and return data, ignoring the error | |
/// In case of errors, returns partial data | |
pub fn ok(self) -> D { | |
match self { | |
PartialResult::Ok(data) => data, | |
PartialResult::Err(data, _) => data, | |
} | |
} | |
} | |
// Impl. conversion into Result<D, E> | |
impl<D, E> From<PartialResult<D, E>> for Result<D, E> { | |
fn from(partial_result: PartialResult<D, E>) -> Self { | |
match partial_result { | |
PartialResult::Ok(data) => Ok(data), | |
PartialResult::Err(_, error) => Err(error), | |
} | |
} | |
} | |
// Impl. basic methods which are analogous to std::result::Result | |
impl<D, E> PartialResult<D, E> { | |
pub fn is_ok(&self) -> bool { | |
match self { | |
PartialResult::Ok(_) => true, | |
PartialResult::Err(_, _) => false, | |
} | |
} | |
pub fn is_err(&self) -> bool { | |
!self.is_ok() | |
} | |
} | |
impl<D, E> PartialResult<D, E> | |
where | |
E: Debug, | |
{ | |
pub fn unwrap(self) -> D { | |
match self { | |
PartialResult::Ok(data) => data, | |
PartialResult::Err(_, err) => panic!("Called unwrap on PartialResult::Err: {:?}", err), | |
} | |
} | |
} |
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