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add the bool::not method. #82786

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Lokathor wants to merge 5 commits into from
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add the bool::not method. #82786

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3db2efb
add the bool::not method.
Lokathor Mar 5, 2021
a25f6f7
document the method.
Lokathor Mar 5, 2021
828aa80
take out the new feature, we don't need a compiler feature.
Lokathor Mar 5, 2021
663ce13
add const modifier and inline attribute to bool::not
Lokathor Mar 11, 2021
00c5426
improve documentation.
Lokathor Mar 28, 2021
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13 changes: 13 additions & 0 deletions library/core/src/bool.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -31,4 +31,17 @@ impl bool {
pub fn then<T, F: FnOnce() -> T>(self, f: F) -> Option<T> {
if self { Some(f()) } else { None }
}

/// Returns the opposite value.
///
/// # Examples
///
/// ```
/// assert_eq!(false.not(), true);
/// assert_eq!(true.not(), false);
/// ```
#[unstable(feature = "bool_not_method", issue = "none")]
pub fn not(self) -> Self {
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@rodrimati1992 rodrimati1992 Mar 10, 2021

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This method could be a const fn, did you decide not to make it one to keep it identical to the Not::not method?

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@Lokathor Lokathor Mar 10, 2021

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good point actually. i only thought of it initially as a replacement for the Not trait being in the prelude, but we could probably go const here.

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@danielhenrymantilla danielhenrymantilla Mar 10, 2021

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Tangentially, it being constable already can also be an added argument for making it an inherent method

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@Pratyush Pratyush Mar 11, 2021

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Note that the intention is to make it possible to make trait impls const also, but we're pretty far from seeing that stabilized.

!self
}
}