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// Copyright 2017 Amanieu d'Antras
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
use std::hint::unreachable_unchecked;
/// An extension trait for `Option<T>` providing unchecked unwrapping methods.
pub trait UncheckedOptionExt<T> {
/// Get the value out of this Option without checking for None.
unsafe fn unchecked_unwrap(self) -> T;
/// Assert that this Option is a None to the optimizer.
unsafe fn unchecked_unwrap_none(self);
}
/// An extension trait for `Result<T, E>` providing unchecked unwrapping methods.
pub trait UncheckedResultExt<T, E> {
/// Get the value out of this Result without checking for Err.
unsafe fn unchecked_unwrap_ok(self) -> T;
/// Get the error out of this Result without checking for Ok.
unsafe fn unchecked_unwrap_err(self) -> E;
}
impl<T> UncheckedOptionExt<T> for Option<T> {
unsafe fn unchecked_unwrap(self) -> T {
match self {
Some(x) => x,
None => unreachable_unchecked(),
}
}
unsafe fn unchecked_unwrap_none(self) {
if self.is_some() {
unreachable_unchecked()
}
}
}
impl<T, E> UncheckedResultExt<T, E> for Result<T, E> {
unsafe fn unchecked_unwrap_ok(self) -> T {
match self {
Ok(x) => x,
Err(_) => unreachable_unchecked(),
}
}
unsafe fn unchecked_unwrap_err(self) -> E {
match self {
Ok(_) => unreachable_unchecked(),
Err(e) => e,
}
}
}
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