Trait std::ops::RangeBounds

RangeBounds 由 Rust 的内置范围类型实现，由 ..、a..、..b、..=c、d..e 或 f..=g 等范围语法生成。

pub trait RangeBounds<T>
where
    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: PartialOrd<T> + ?Sized { ... }
}

Required Methods

start_bound

开始索引绑定。

以 Bound 形式返回起始值。

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

返回值：返回一个Bound枚举

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

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

end_bound

结束索引绑定。

将结束值返回为 Bound。

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

返回值：返回一个Bound枚举

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

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

Provided Methods

contains

如果范围中包含 item，则返回 true。

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

参数：

• item：需要判断是否包含的项

返回值：根据是否包含返回bool值

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));

Implementors

(Bound<&'a T>, Bound<&'a T>)

impl<'a, T> RangeBounds<T> for (Bound<&'a T>, Bound<&'a T>)
where
  T: 'a + ?Sized,

(Bound<T>, Bound<T>)

impl<T> RangeBounds<T> for (Bound<T>, Bound<T>)

Range<&T>

impl<T> RangeBounds<T> for Range<&T>

Range<T>

impl<T> RangeBounds<T> for Range<T>

RangeFrom<&T>

impl<T> RangeBounds<T> for RangeFrom<&T>

RangeFrom<T>

impl<T> RangeBounds<T> for RangeFrom<T>

RangeFull

impl<T> RangeBounds<T> for RangeFull
where
  T: ?Sized,

RangeInclusive<T>

impl<T> RangeBounds<T> for RangeInclusive<&T>

RangeInclusive<T>

impl<T> RangeBounds<T> for RangeInclusive<T>

RangeTo<&T>

impl<T> RangeBounds<T> for RangeTo<&T>

RangeTo<T>

impl<T> RangeBounds<T> for RangeTo<T>

RangeToInclusive<&T>

impl<T> RangeBounds<T> for RangeToInclusive<&T>

RangeToInclusive<T>

impl<T> RangeBounds<T> for RangeToInclusive<T>