Struct core::ops::RangeInclusive
1.26.0 · source · pub struct RangeInclusive<Idx> { /* private fields */ }
Expand description
范围包括 (start..=end
) 的上下边界。
RangeInclusive
start..=end
包含 x >= start
和 x <= end
的所有值。除非 start <= end
,否则为空。
这个迭代器是 fused,但是迭代完成后 start
和 end
的特定值是未指定的,除了 .is_empty()
之外,一旦不再产生值,就会返回 true
。
Examples
start..=end
语法是 RangeInclusive
:
assert_eq!((3..=5), std::ops::RangeInclusive::new(3, 5));
assert_eq!(3 + 4 + 5, (3..=5).sum());
Runlet arr = [0, 1, 2, 3, 4];
assert_eq!(arr[ .. ], [0, 1, 2, 3, 4]);
assert_eq!(arr[ .. 3], [0, 1, 2 ]);
assert_eq!(arr[ ..=3], [0, 1, 2, 3 ]);
assert_eq!(arr[1.. ], [ 1, 2, 3, 4]);
assert_eq!(arr[1.. 3], [ 1, 2 ]);
assert_eq!(arr[1..=3], [ 1, 2, 3 ]); // 这是 `RangeInclusive`
RunImplementations§
source§impl<Idx> RangeInclusive<Idx>
impl<Idx> RangeInclusive<Idx>
1.27.0 (const: 1.32.0) · sourcepub const fn start(&self) -> &Idx
pub const fn start(&self) -> &Idx
返回范围的下限 (包括下限)。
当使用包含范围进行迭代时,在迭代结束后未指定 start()
和 end()
的值。
若要确定包含范围是否为空,请使用 is_empty()
方法而不是比较 start() > end()
。
Note: 范围迭代到穷竭之后,此方法返回的值是不确定的。
Examples
assert_eq!((3..=5).start(), &3);
Run1.27.0 (const: 1.32.0) · sourcepub const fn end(&self) -> &Idx
pub const fn end(&self) -> &Idx
返回范围的上限 (包括上限)。
当使用包含范围进行迭代时,在迭代结束后未指定 start()
和 end()
的值。
若要确定包含范围是否为空,请使用 is_empty()
方法而不是比较 start() > end()
。
Note: 范围迭代到穷竭之后,此方法返回的值是不确定的。
Examples
assert_eq!((3..=5).end(), &5);
Run1.27.0 (const: unstable) · sourcepub fn into_inner(self) -> (Idx, Idx)
pub fn into_inner(self) -> (Idx, Idx)
source§impl<Idx: PartialOrd<Idx>> RangeInclusive<Idx>
impl<Idx: PartialOrd<Idx>> RangeInclusive<Idx>
1.35.0 · sourcepub fn contains<U>(&self, item: &U) -> boolwhere
Idx: PartialOrd<U>,
U: ?Sized + PartialOrd<Idx>,
pub fn contains<U>(&self, item: &U) -> boolwhere Idx: PartialOrd<U>, U: ?Sized + PartialOrd<Idx>,
如果范围中包含 item
,则返回 true
。
Examples
assert!(!(3..=5).contains(&2));
assert!( (3..=5).contains(&3));
assert!( (3..=5).contains(&4));
assert!( (3..=5).contains(&5));
assert!(!(3..=5).contains(&6));
assert!( (3..=3).contains(&3));
assert!(!(3..=2).contains(&3));
assert!( (0.0..=1.0).contains(&1.0));
assert!(!(0.0..=1.0).contains(&f32::NAN));
assert!(!(0.0..=f32::NAN).contains(&0.0));
assert!(!(f32::NAN..=1.0).contains(&1.0));
Run迭代完成后,此方法总是返回 false
:
let mut r = 3..=5;
assert!(r.contains(&3) && r.contains(&5));
for _ in r.by_ref() {}
// 此处未指定精确的字段值
assert!(!r.contains(&3) && !r.contains(&5));
Run1.47.0 · sourcepub fn is_empty(&self) -> bool
pub fn is_empty(&self) -> bool
如果范围不包含任何项,则返回 true
。
Examples
assert!(!(3..=5).is_empty());
assert!(!(3..=3).is_empty());
assert!( (3..=2).is_empty());
Run如果任何一方都无法比拟,则范围为空:
assert!(!(3.0..=5.0).is_empty());
assert!( (3.0..=f32::NAN).is_empty());
assert!( (f32::NAN..=5.0).is_empty());
Run迭代完成后,此方法返回 true
:
let mut r = 3..=5;
for _ in r.by_ref() {}
// 此处未指定精确的字段值
assert!(r.is_empty());
RunTrait Implementations§
source§impl<Idx: Clone> Clone for RangeInclusive<Idx>
impl<Idx: Clone> Clone for RangeInclusive<Idx>
source§impl<Idx: Debug> Debug for RangeInclusive<Idx>
impl<Idx: Debug> Debug for RangeInclusive<Idx>
source§impl<A: Step> DoubleEndedIterator for RangeInclusive<A>
impl<A: Step> DoubleEndedIterator for RangeInclusive<A>
source§fn try_rfold<B, F, R>(&mut self, init: B, f: F) -> Rwhere
Self: Sized,
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,
fn try_rfold<B, F, R>(&mut self, init: B, f: F) -> Rwhere Self: Sized, F: FnMut(B, Self::Item) -> R, R: Try<Output = B>,
Iterator::try_fold()
的反向版本:它从迭代器的后面开始接收元素。 Read moresource§fn rfold<AAA, FFF>(self, init: AAA, fold: FFF) -> AAAwhere
FFF: FnMut(AAA, Self::Item) -> AAA,
fn rfold<AAA, FFF>(self, init: AAA, fold: FFF) -> AAAwhere FFF: FnMut(AAA, Self::Item) -> AAA,
source§fn advance_back_by(&mut self, n: usize) -> Result<(), NonZeroUsize>
fn advance_back_by(&mut self, n: usize) -> Result<(), NonZeroUsize>
iter_advance_by
#77404)n
元素从后向前推进迭代器。 Read moresource§impl ExactSizeIterator for RangeInclusive<i16>
impl ExactSizeIterator for RangeInclusive<i16>
source§impl ExactSizeIterator for RangeInclusive<i8>
impl ExactSizeIterator for RangeInclusive<i8>
source§impl ExactSizeIterator for RangeInclusive<u16>
impl ExactSizeIterator for RangeInclusive<u16>
source§impl ExactSizeIterator for RangeInclusive<u8>
impl ExactSizeIterator for RangeInclusive<u8>
source§impl<Idx: Hash> Hash for RangeInclusive<Idx>
impl<Idx: Hash> Hash for RangeInclusive<Idx>
source§impl<A: Step> Iterator for RangeInclusive<A>
impl<A: Step> Iterator for RangeInclusive<A>
source§fn try_fold<B, F, R>(&mut self, init: B, f: F) -> Rwhere
Self: Sized,
F: FnMut(B, Self::Item) -> R,
R: Try<Output = B>,
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source§fn fold<AAA, FFF>(self, init: AAA, fold: FFF) -> AAAwhere
FFF: FnMut(AAA, Self::Item) -> AAA,
fn fold<AAA, FFF>(self, init: AAA, fold: FFF) -> AAAwhere FFF: FnMut(AAA, Self::Item) -> AAA,
fold
到一个累加器中,返回最终结果。 Read moresource§fn is_sorted(self) -> bool
fn is_sorted(self) -> bool
is_sorted
#53485)source§fn next_chunk<const N: usize>(
&mut self
) -> Result<[Self::Item; N], IntoIter<Self::Item, N>>where
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fn advance_by(&mut self, n: usize) -> Result<(), NonZeroUsize>
iter_advance_by
#77404)n
元素使迭代器前进。 Read more1.28.0 · source§fn step_by(self, step: usize) -> StepBy<Self> ⓘwhere
Self: Sized,
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#79524)separator
生成的项放在原始迭代器的相邻项之间。 Read more1.0.0 · source§fn map<B, F>(self, f: F) -> Map<Self, F> ⓘwhere
Self: Sized,
F: FnMut(Self::Item) -> B,
fn map<B, F>(self, f: F) -> Map<Self, F> ⓘwhere Self: Sized, F: FnMut(Self::Item) -> B,
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n
个元素的迭代器。 Read more1.0.0 · source§fn take(self, n: usize) -> Take<Self> ⓘwhere
Self: Sized,
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n
元素,如果底层迭代器提前结束,则产生更少的元素。 Read more1.0.0 · source§fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F> ⓘwhere
Self: Sized,
F: FnMut(&mut St, Self::Item) -> Option<B>,
fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F> ⓘwhere Self: Sized, F: FnMut(&mut St, Self::Item) -> Option<B>,
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F: FnMut(Self::Item) -> U,
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Self: Sized,
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iter_collect_into
#94780)1.0.0 · source§fn partition<B, F>(self, f: F) -> (B, B)where
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B: Default + Extend<Self::Item>,
F: FnMut(&Self::Item) -> bool,
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source§fn partition_in_place<'a, T: 'a, P>(self, predicate: P) -> usizewhere
Self: Sized + DoubleEndedIterator<Item = &'a mut T>,
P: FnMut(&T) -> bool,
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#62543)source§fn is_partitioned<P>(self, predicate: P) -> boolwhere
Self: Sized,
P: FnMut(Self::Item) -> bool,
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iter_is_partitioned
#62544)1.27.0 · source§fn try_for_each<F, R>(&mut self, f: F) -> Rwhere
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R: Try<Output = ()>,
fn try_for_each<F, R>(&mut self, f: F) -> Rwhere Self: Sized, F: FnMut(Self::Item) -> R, R: Try<Output = ()>,
1.51.0 · source§fn reduce<F>(self, f: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(Self::Item, Self::Item) -> Self::Item,
fn reduce<F>(self, f: F) -> Option<Self::Item>where Self: Sized, F: FnMut(Self::Item, Self::Item) -> Self::Item,
source§fn try_reduce<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<R::Output>>>::TryTypewhere
Self: Sized,
F: FnMut(Self::Item, Self::Item) -> R,
R: Try<Output = Self::Item>,
R::Residual: Residual<Option<Self::Item>>,
fn try_reduce<F, R>( &mut self, f: F ) -> <<R as Try>::Residual as Residual<Option<R::Output>>>::TryTypewhere Self: Sized, F: FnMut(Self::Item, Self::Item) -> R, R: Try<Output = Self::Item>, R::Residual: Residual<Option<Self::Item>>,
iterator_try_reduce
#87053)1.0.0 · source§fn all<F>(&mut self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> bool,
fn all<F>(&mut self, f: F) -> boolwhere Self: Sized, F: FnMut(Self::Item) -> bool,
1.0.0 · source§fn any<F>(&mut self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> bool,
fn any<F>(&mut self, f: F) -> boolwhere Self: Sized, F: FnMut(Self::Item) -> bool,
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Self: Sized,
P: FnMut(&Self::Item) -> bool,
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Self: Sized,
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source§fn try_find<F, R>(
&mut self,
f: F
) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryTypewhere
Self: Sized,
F: FnMut(&Self::Item) -> R,
R: Try<Output = bool>,
R::Residual: Residual<Option<Self::Item>>,
fn try_find<F, R>( &mut self, f: F ) -> <<R as Try>::Residual as Residual<Option<Self::Item>>>::TryTypewhere Self: Sized, F: FnMut(&Self::Item) -> R, R: Try<Output = bool>, R::Residual: Residual<Option<Self::Item>>,
try_find
#63178)1.0.0 · source§fn position<P>(&mut self, predicate: P) -> Option<usize>where
Self: Sized,
P: FnMut(Self::Item) -> bool,
fn position<P>(&mut self, predicate: P) -> Option<usize>where Self: Sized, P: FnMut(Self::Item) -> bool,
1.6.0 · source§fn max_by_key<B: Ord, F>(self, f: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item) -> B,
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1.15.0 · source§fn max_by<F>(self, compare: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
fn max_by<F>(self, compare: F) -> Option<Self::Item>where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Ordering,
1.6.0 · source§fn min_by_key<B: Ord, F>(self, f: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item) -> B,
fn min_by_key<B: Ord, F>(self, f: F) -> Option<Self::Item>where Self: Sized, F: FnMut(&Self::Item) -> B,
1.15.0 · source§fn min_by<F>(self, compare: F) -> Option<Self::Item>where
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Ordering,
fn min_by<F>(self, compare: F) -> Option<Self::Item>where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Ordering,
1.0.0 · source§fn rev(self) -> Rev<Self> ⓘwhere
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fn rev(self) -> Rev<Self> ⓘwhere Self: Sized + DoubleEndedIterator,
1.0.0 · source§fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB)where
FromA: Default + Extend<A>,
FromB: Default + Extend<B>,
Self: Sized + Iterator<Item = (A, B)>,
fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB)where FromA: Default + Extend<A>, FromB: Default + Extend<B>, Self: Sized + Iterator<Item = (A, B)>,
1.36.0 · source§fn copied<'a, T>(self) -> Copied<Self> ⓘwhere
Self: Sized + Iterator<Item = &'a T>,
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source§fn array_chunks<const N: usize>(self) -> ArrayChunks<Self, N> ⓘwhere
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iter_array_chunks
#100450)N
个元素的迭代器。 Read more1.11.0 · source§fn product<P>(self) -> Pwhere
Self: Sized,
P: Product<Self::Item>,
fn product<P>(self) -> Pwhere Self: Sized, P: Product<Self::Item>,
source§fn cmp_by<I, F>(self, other: I, cmp: F) -> Orderingwhere
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I: IntoIterator,
F: FnMut(Self::Item, I::Item) -> Ordering,
fn cmp_by<I, F>(self, other: I, cmp: F) -> Orderingwhere Self: Sized, I: IntoIterator, F: FnMut(Self::Item, I::Item) -> Ordering,
iter_order_by
#64295)1.5.0 · source§fn partial_cmp<I>(self, other: I) -> Option<Ordering>where
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
fn partial_cmp<I>(self, other: I) -> Option<Ordering>where I: IntoIterator, Self::Item: PartialOrd<I::Item>, Self: Sized,
Iterator
的 PartialOrd
元素与另一个 PartialOrd
的元素进行比较。
比较的工作方式类似于短路评估,返回结果而不比较其余元素。
一旦可以确定订单,评估就会停止并返回结果。 Read moresource§fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>where
Self: Sized,
I: IntoIterator,
F: FnMut(Self::Item, I::Item) -> Option<Ordering>,
fn partial_cmp_by<I, F>(self, other: I, partial_cmp: F) -> Option<Ordering>where Self: Sized, I: IntoIterator, F: FnMut(Self::Item, I::Item) -> Option<Ordering>,
iter_order_by
#64295)1.5.0 · source§fn eq<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialEq<I::Item>,
Self: Sized,
fn eq<I>(self, other: I) -> boolwhere I: IntoIterator, Self::Item: PartialEq<I::Item>, Self: Sized,
source§fn eq_by<I, F>(self, other: I, eq: F) -> boolwhere
Self: Sized,
I: IntoIterator,
F: FnMut(Self::Item, I::Item) -> bool,
fn eq_by<I, F>(self, other: I, eq: F) -> boolwhere Self: Sized, I: IntoIterator, F: FnMut(Self::Item, I::Item) -> bool,
iter_order_by
#64295)1.5.0 · source§fn ne<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialEq<I::Item>,
Self: Sized,
fn ne<I>(self, other: I) -> boolwhere I: IntoIterator, Self::Item: PartialEq<I::Item>, Self: Sized,
1.5.0 · source§fn lt<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
fn lt<I>(self, other: I) -> boolwhere I: IntoIterator, Self::Item: PartialOrd<I::Item>, Self: Sized,
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I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
fn le<I>(self, other: I) -> boolwhere I: IntoIterator, Self::Item: PartialOrd<I::Item>, Self: Sized,
1.5.0 · source§fn gt<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
fn gt<I>(self, other: I) -> boolwhere I: IntoIterator, Self::Item: PartialOrd<I::Item>, Self: Sized,
1.5.0 · source§fn ge<I>(self, other: I) -> boolwhere
I: IntoIterator,
Self::Item: PartialOrd<I::Item>,
Self: Sized,
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source§fn is_sorted_by<F>(self, compare: F) -> boolwhere
Self: Sized,
F: FnMut(&Self::Item, &Self::Item) -> Option<Ordering>,
fn is_sorted_by<F>(self, compare: F) -> boolwhere Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Option<Ordering>,
is_sorted
#53485)source§fn is_sorted_by_key<F, K>(self, f: F) -> boolwhere
Self: Sized,
F: FnMut(Self::Item) -> K,
K: PartialOrd,
fn is_sorted_by_key<F, K>(self, f: F) -> boolwhere Self: Sized, F: FnMut(Self::Item) -> K, K: PartialOrd,
is_sorted
#53485)source§impl<Idx: PartialEq> PartialEq<RangeInclusive<Idx>> for RangeInclusive<Idx>
impl<Idx: PartialEq> PartialEq<RangeInclusive<Idx>> for RangeInclusive<Idx>
1.28.0 · source§impl<T> RangeBounds<T> for RangeInclusive<&T>
impl<T> RangeBounds<T> for RangeInclusive<&T>
1.28.0 · source§impl<T> RangeBounds<T> for RangeInclusive<T>
impl<T> RangeBounds<T> for RangeInclusive<T>
const: unstable · source§impl<T> SliceIndex<[T]> for RangeInclusive<usize>
impl<T> SliceIndex<[T]> for RangeInclusive<usize>
const: unstable · source§fn get(self, slice: &[T]) -> Option<&[T]>
fn get(self, slice: &[T]) -> Option<&[T]>
slice_index_methods
)const: unstable · source§fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
slice_index_methods
)const: unstable · source§unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
slice_index_methods
)slice
指针调用此方法也是 [undefined 行为]。const: unstable · source§unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
slice_index_methods
)slice
指针调用此方法也是 [undefined 行为]。const: unstable · source§impl SliceIndex<str> for RangeInclusive<usize>
impl SliceIndex<str> for RangeInclusive<usize>
使用语法 &self[begin ..= end]
或 &mut self[begin ..= end]
实现子字符串切片。
从字节范围 [begin
, end
] 返回给定字符串的切片。等效于 &self [begin .. end + 1]
或 &mut self[begin .. end + 1]
,除非 end
具有 usize
的最大值。
此运算为 O(1)。
Panics
如果 begin
没有指向字符的起始字节偏移量 (由 is_char_boundary
定义),如果 end
没有指向字符的结束字节偏移量 (end + 1
是起始字节偏移量或等于 len
),如果 begin > end
,或者如果 end >= len
,就会出现 panics。
const: unstable · source§fn get(self, slice: &str) -> Option<&Self::Output>
fn get(self, slice: &str) -> Option<&Self::Output>
slice_index_methods
)const: unstable · source§fn get_mut(self, slice: &mut str) -> Option<&mut Self::Output>
fn get_mut(self, slice: &mut str) -> Option<&mut Self::Output>
slice_index_methods
)const: unstable · source§unsafe fn get_unchecked(self, slice: *const str) -> *const Self::Output
unsafe fn get_unchecked(self, slice: *const str) -> *const Self::Output
slice_index_methods
)slice
指针调用此方法也是 [undefined 行为]。const: unstable · source§unsafe fn get_unchecked_mut(self, slice: *mut str) -> *mut Self::Output
unsafe fn get_unchecked_mut(self, slice: *mut str) -> *mut Self::Output
slice_index_methods
)slice
指针调用此方法也是 [undefined 行为]。