36 lines
1.0 KiB
Rust
36 lines
1.0 KiB
Rust
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// Copyright 2020 Amari Robinson
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//
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// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
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// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
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// http://opensource.org/licenses/MIT>, at your option. This file may not be
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// copied, modified, or distributed except according to those terms.
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use core::hint;
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/// An extension trait on `Option`.
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pub trait UncheckedOptionExt<T> {
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/// Returns the contained value.
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///
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/// # Safety
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///
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/// It is up to the caller to guarantee that the `Option<T>` is `Some(v)`.
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/// Calling this when it is `None` causes undefined behavior.
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unsafe fn unwrap_unchecked(self) -> T;
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}
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impl<T> UncheckedOptionExt<T> for Option<T> {
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#[inline]
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unsafe fn unwrap_unchecked(self) -> T {
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match self {
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Some(x) => x,
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None => {
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if cfg!(debug_assertions) {
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unreachable!()
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} else {
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hint::unreachable_unchecked()
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}
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}
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}
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}
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}
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