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use std::fmt;
use std::error;
pub struct AsyncError<T, E> {
state: T,
error: E,
}
impl<T, E> AsyncError<T, E>
where
E: error::Error,
{
pub fn new(state: T, error: E) -> Self {
AsyncError {
state: state,
error: error,
}
}
pub fn state_ref(&self) -> &T {
&self.state
}
pub fn state_muf(&mut self) -> &mut T {
&mut self.state
}
pub fn into_state(self) -> T {
self.state
}
pub fn error_ref(&self) -> &E {
&self.error
}
pub fn error_mut(&mut self) -> &mut E {
&mut self.error
}
pub fn into_error(self) -> E {
self.error
}
pub fn unwrap(self) -> (T, E) {
(self.state, self.error)
}
pub fn map_state<F, U>(self, f: F) -> AsyncError<U, E>
where
F: FnOnce(T) -> U,
{
AsyncError {
state: f(self.state),
error: self.error,
}
}
}
impl<T, E> fmt::Debug for AsyncError<T, E>
where
E: error::Error,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "AsyncError {{ state: _, error: {:?} }}", self.error)
}
}
impl<T, E> fmt::Display for AsyncError<T, E>
where
E: error::Error,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Asynchronous Error: {}", self.error)
}
}
impl<T, E> error::Error for AsyncError<T, E>
where
E: error::Error,
{
fn description(&self) -> &str {
self.error.description()
}
fn cause(&self) -> Option<&error::Error> {
self.error.cause()
}
}