core::ops

Trait RangeBounds

1.26.0 (const: unstable) · Source

pub trait RangeBounds<T: ?Sized> {
    // Required methods
    fn start_bound(&self) -> Bound<&T>;
    fn end_bound(&self) -> Bound<&T>;

    // Provided method
    fn contains<U>(&self, item: &U) -> bool
       where T: PartialOrd<U>,
             U: ?Sized + PartialOrd<T> { ... }
}

Expand description

RangeBounds is implemented by Rust’s built-in range types, produced by range syntax like .., a.., ..b, ..=c, d..e, or f..=g.

Required Methods§

1.28.0 · Source

fn start_bound(&self) -> Bound<&T>

Start index bound.

Returns the start value as a Bound.

§Examples

use std::ops::Bound::*;
use std::ops::RangeBounds;

assert_eq!((..10).start_bound(), Unbounded);
assert_eq!((3..10).start_bound(), Included(&3));

1.28.0 · Source

fn end_bound(&self) -> Bound<&T>

End index bound.

Returns the end value as a Bound.

§Examples

use std::ops::Bound::*;
use std::ops::RangeBounds;

assert_eq!((3..).end_bound(), Unbounded);
assert_eq!((3..10).end_bound(), Excluded(&10));

Provided Methods§

1.35.0 · Source

fn contains<U>(&self, item: &U) -> bool
where T: PartialOrd<U>, U: ?Sized + PartialOrd<T>,

Returns true if item is contained in the range.

§Examples

assert!( (3..5).contains(&4));
assert!(!(3..5).contains(&2));

assert!( (0.0..1.0).contains(&0.5));
assert!(!(0.0..1.0).contains(&f32::NAN));
assert!(!(0.0..f32::NAN).contains(&0.5));
assert!(!(f32::NAN..1.0).contains(&0.5));

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.