Lightweight error-handling for transforming values into std::io::Result. Provides:
Option<T>::oops(self, &str) -> std::io::Result<T>Result<T, E>::oops(self, &str) -> std::io::Result<T>Option<T>::lazy_oops(self, FnOnce() -> String) -> std::io::Result<T>Resukt<T, E>::lazy_oops(self, FnOnce() -> String) -> std::io::Result<T>
Examples
use std::io::Result;
fn third_element(slice: &[usize]) -> Result<&usize> {
// Using oops to add context to a None
slice.iter().nth(3).oops("No third element")
}
fn parse_batch(slice: &[&str]) -> Result<Vec<usize>> {
slice
.iter()
.map(|v| {
v
.parse::<usize>()
// Using lazy_oops to add debug messages
.lazy_oops(|| format!("Failed to parse {} from {:?}", v, slice))
})
.collect()
}
assert_eq!(
// No third element
third_element(&[1, 2, 3]).err().unwrap().kind(),
std::io::ErrorKind::Other
);
assert_eq!(
// Failed to parse lo from ["2", "3", "7", "lo", "11"]
parse_batch(&["2", "3", "7", "lo", "11"]).err().unwrap().kind(),
std::io::ErrorKind::Other
);
