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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:11:38 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:12:43 +0000 |
commit | cf94bdc0742c13e2a0cac864c478b8626b266e1b (patch) | |
tree | 044670aa50cc5e2b4229aa0b6b3df6676730c0a6 /library/core/src/bool.rs | |
parent | Adding debian version 1.65.0+dfsg1-2. (diff) | |
download | rustc-cf94bdc0742c13e2a0cac864c478b8626b266e1b.tar.xz rustc-cf94bdc0742c13e2a0cac864c478b8626b266e1b.zip |
Merging upstream version 1.66.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | library/core/src/bool.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/library/core/src/bool.rs b/library/core/src/bool.rs index 7667a6508..db1c505ba 100644 --- a/library/core/src/bool.rs +++ b/library/core/src/bool.rs @@ -18,6 +18,18 @@ impl bool { /// assert_eq!(false.then_some(0), None); /// assert_eq!(true.then_some(0), Some(0)); /// ``` + /// + /// ``` + /// let mut a = 0; + /// let mut function_with_side_effects = || { a += 1; }; + /// + /// true.then_some(function_with_side_effects()); + /// false.then_some(function_with_side_effects()); + /// + /// // `a` is incremented twice because the value passed to `then_some` is + /// // evaluated eagerly. + /// assert_eq!(a, 2); + /// ``` #[stable(feature = "bool_to_option", since = "1.62.0")] #[rustc_const_unstable(feature = "const_bool_to_option", issue = "91917")] #[inline] @@ -37,6 +49,17 @@ impl bool { /// assert_eq!(false.then(|| 0), None); /// assert_eq!(true.then(|| 0), Some(0)); /// ``` + /// + /// ``` + /// let mut a = 0; + /// + /// true.then(|| { a += 1; }); + /// false.then(|| { a += 1; }); + /// + /// // `a` is incremented once because the closure is evaluated lazily by + /// // `then`. + /// assert_eq!(a, 1); + /// ``` #[stable(feature = "lazy_bool_to_option", since = "1.50.0")] #[rustc_const_unstable(feature = "const_bool_to_option", issue = "91917")] #[inline] |