/// Extensions to [`Result`].
///
/// Provides behavior currently unstable:
/// - `result_option_inspect` [#91345](https://github.com/rust-lang/rust/issues/91345)
pub trait ResultExt<T, E> {
/// Calls the provided closure with a reference to the contained value (if [`Ok`]).
///
/// # Examples
///
/// ````
/// # use si_std::ResultExt;
/// let x: u8 = "4"
/// .parse::<u8>()
/// .si_inspect(|x| println!("original: {x}"))
/// .map(|x| x.pow(3))
/// .expect("failed to parse number");
/// ````
fn si_inspect<F: FnOnce(&T)>(self, f: F) -> Self;
/// Calls the provided closure with a reference to the contained error (if [`Err`]).
///
/// # Examples
///
/// ```
/// # use si_std::ResultExt;
/// use std::{fs, io};
///
/// fn read() -> io::Result<String> {
/// fs::read_to_string("address.txt")
/// .si_inspect_err(|e| eprintln!("failed to read file: {e}"))
/// }
/// ```
fn si_inspect_err<F: FnOnce(&E)>(self, f: F) -> Self;
}
impl<T, E> ResultExt<T, E> for Result<T, E> {
fn si_inspect<F: FnOnce(&T)>(self, f: F) -> Self {
if let Ok(ref t) = self {
f(t)
}
self
}
fn si_inspect_err<F: FnOnce(&E)>(self, f: F) -> Self {
if let Err(ref e) = self {
f(e);
}
self
}
}
