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Mark several functions and methods in core::cmp as #[must_use] #68946

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Feb 9, 2020
Merged

Mark several functions and methods in core::cmp as #[must_use] #68946

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13 changes: 13 additions & 0 deletions src/libcore/cmp.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -361,6 +361,7 @@ impl Ordering {
/// assert!(data == b);
/// ```
#[inline]
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
pub fn reverse(self) -> Ordering {
match self {
Expand Down Expand Up @@ -398,6 +399,7 @@ impl Ordering {
/// assert_eq!(result, Ordering::Less);
/// ```
#[inline]
#[must_use]
#[stable(feature = "ordering_chaining", since = "1.17.0")]
pub fn then(self, other: Ordering) -> Ordering {
match self {
Expand Down Expand Up @@ -435,6 +437,7 @@ impl Ordering {
/// assert_eq!(result, Ordering::Less);
/// ```
#[inline]
#[must_use]
#[stable(feature = "ordering_chaining", since = "1.17.0")]
pub fn then_with<F: FnOnce() -> Ordering>(self, f: F) -> Ordering {
match self {
Expand Down Expand Up @@ -576,6 +579,7 @@ pub trait Ord: Eq + PartialOrd<Self> {
/// assert_eq!(10.cmp(&5), Ordering::Greater);
/// assert_eq!(5.cmp(&5), Ordering::Equal);
/// ```
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
fn cmp(&self, other: &Self) -> Ordering;

Expand All @@ -591,6 +595,7 @@ pub trait Ord: Eq + PartialOrd<Self> {
/// ```
#[stable(feature = "ord_max_min", since = "1.21.0")]
#[inline]
#[must_use]
fn max(self, other: Self) -> Self
where
Self: Sized,
Expand All @@ -610,6 +615,7 @@ pub trait Ord: Eq + PartialOrd<Self> {
/// ```
#[stable(feature = "ord_max_min", since = "1.21.0")]
#[inline]
#[must_use]
fn min(self, other: Self) -> Self
where
Self: Sized,
Expand All @@ -635,6 +641,7 @@ pub trait Ord: Eq + PartialOrd<Self> {
/// assert!(0.clamp(-2, 1) == 0);
/// assert!(2.clamp(-2, 1) == 1);
/// ```
#[must_use]
#[unstable(feature = "clamp", issue = "44095")]
fn clamp(self, min: Self, max: Self) -> Self
where
Expand Down Expand Up @@ -915,6 +922,7 @@ pub macro PartialOrd($item:item) {
/// assert_eq!(2, cmp::min(2, 2));
/// ```
#[inline]
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
pub fn min<T: Ord>(v1: T, v2: T) -> T {
v1.min(v2)
Expand All @@ -935,6 +943,7 @@ pub fn min<T: Ord>(v1: T, v2: T) -> T {
/// assert_eq!(cmp::min_by(-2, 2, |x: &i32, y: &i32| x.abs().cmp(&y.abs())), -2);
/// ```
#[inline]
#[must_use]
#[unstable(feature = "cmp_min_max_by", issue = "64460")]
pub fn min_by<T, F: FnOnce(&T, &T) -> Ordering>(v1: T, v2: T, compare: F) -> T {
match compare(&v1, &v2) {
Expand All @@ -958,6 +967,7 @@ pub fn min_by<T, F: FnOnce(&T, &T) -> Ordering>(v1: T, v2: T, compare: F) -> T {
/// assert_eq!(cmp::min_by_key(-2, 2, |x: &i32| x.abs()), -2);
/// ```
#[inline]
#[must_use]
#[unstable(feature = "cmp_min_max_by", issue = "64460")]
pub fn min_by_key<T, F: FnMut(&T) -> K, K: Ord>(v1: T, v2: T, mut f: F) -> T {
min_by(v1, v2, |v1, v2| f(v1).cmp(&f(v2)))
Expand All @@ -978,6 +988,7 @@ pub fn min_by_key<T, F: FnMut(&T) -> K, K: Ord>(v1: T, v2: T, mut f: F) -> T {
/// assert_eq!(2, cmp::max(2, 2));
/// ```
#[inline]
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
pub fn max<T: Ord>(v1: T, v2: T) -> T {
v1.max(v2)
Expand All @@ -998,6 +1009,7 @@ pub fn max<T: Ord>(v1: T, v2: T) -> T {
/// assert_eq!(cmp::max_by(-2, 2, |x: &i32, y: &i32| x.abs().cmp(&y.abs())), 2);
/// ```
#[inline]
#[must_use]
#[unstable(feature = "cmp_min_max_by", issue = "64460")]
pub fn max_by<T, F: FnOnce(&T, &T) -> Ordering>(v1: T, v2: T, compare: F) -> T {
match compare(&v1, &v2) {
Expand All @@ -1021,6 +1033,7 @@ pub fn max_by<T, F: FnOnce(&T, &T) -> Ordering>(v1: T, v2: T, compare: F) -> T {
/// assert_eq!(cmp::max_by_key(-2, 2, |x: &i32| x.abs()), 2);
/// ```
#[inline]
#[must_use]
#[unstable(feature = "cmp_min_max_by", issue = "64460")]
pub fn max_by_key<T, F: FnMut(&T) -> K, K: Ord>(v1: T, v2: T, mut f: F) -> T {
max_by(v1, v2, |v1, v2| f(v1).cmp(&f(v2)))
Expand Down