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https://github.com/rust-lang/rust.git
synced 2026-05-04 09:53:04 +03:00
Joshua Nelson
69fe39e8a8
This works by doing two things: - Adding links that are specific to the crate. Since not all primitive items are defined in `core` (due to lang_items), these need to use relative links and not intra-doc links. - Duplicating `primitive_docs` in both core and std. This allows not needing CARGO_PKG_NAME to build the standard library. It also adds a tidy check to make sure they stay the same.
37 lines
981 B
Rust
37 lines
981 B
Rust
//! impl bool {}
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#[lang = "bool"]
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impl bool {
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/// Returns `Some(t)` if the `bool` is [`true`](../std/keyword.true.html),
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/// or `None` otherwise.
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///
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/// # Examples
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///
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/// ```
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/// #![feature(bool_to_option)]
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///
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/// assert_eq!(false.then_some(0), None);
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/// assert_eq!(true.then_some(0), Some(0));
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/// ```
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#[unstable(feature = "bool_to_option", issue = "80967")]
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#[inline]
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pub fn then_some<T>(self, t: T) -> Option<T> {
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if self { Some(t) } else { None }
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}
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/// Returns `Some(f())` if the `bool` is [`true`](../std/keyword.true.html),
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/// or `None` otherwise.
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///
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/// # Examples
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///
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/// ```
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/// assert_eq!(false.then(|| 0), None);
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/// assert_eq!(true.then(|| 0), Some(0));
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/// ```
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#[stable(feature = "lazy_bool_to_option", since = "1.50.0")]
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#[inline]
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pub fn then<T, F: FnOnce() -> T>(self, f: F) -> Option<T> {
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if self { Some(f()) } else { None }
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}
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}
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