1.0.0[][src]Struct core::ops::RangeFrom

pub struct RangeFrom<Idx> {
    pub start: Idx,
}

A range only bounded inclusively below (start..).

The RangeFrom start.. contains all values with x >= start.

Note: Overflow in the Iterator implementation (when the contained data type reaches its numerical limit) is allowed to panic, wrap, or saturate. This behavior is defined by the implementation of the Step trait. For primitive integers, this follows the normal rules, and respects the overflow checks profile (panic in debug, wrap in release). Note also that overflow happens earlier than you might assume: the overflow happens in the call to next that yields the maximum value, as the range must be set to a state to yield the next value.

Examples

assert_eq!((2..), std::ops::RangeFrom { start: 2 });
assert_eq!(2 + 3 + 4, (2..).take(3).sum());

let 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]);  // RangeFrom
assert_eq!(arr[1.. 3], [  1,2    ]);
assert_eq!(arr[1..=3], [  1,2,3  ]);
Run

Fields

start: Idx

The lower bound of the range (inclusive).

Implementations

impl<Idx: PartialOrd<Idx>> RangeFrom<Idx>[src]

pub fn contains<U: ?Sized>(&self, item: &U) -> bool where
    Idx: PartialOrd<U>,
    U: PartialOrd<Idx>, 
1.35.0[src]

Returns true if item is contained in the range.

Examples

assert!(!(3..).contains(&2));
assert!( (3..).contains(&3));
assert!( (3..).contains(&1_000_000_000));

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

Trait Implementations

impl<Idx: Clone> Clone for RangeFrom<Idx>[src]

impl<Idx: Debug> Debug for RangeFrom<Idx>[src]

impl<Idx: Eq> Eq for RangeFrom<Idx>[src]

impl<A: Step> FusedIterator for RangeFrom<A>1.26.0[src]

impl<Idx: Hash> Hash for RangeFrom<Idx>[src]

impl<A: Step> Iterator for RangeFrom<A>[src]

type Item = A

The type of the elements being iterated over.

impl<Idx: PartialEq> PartialEq<RangeFrom<Idx>> for RangeFrom<Idx>[src]

impl<T> RangeBounds<T> for RangeFrom<T>1.28.0[src]

impl<'_, T> RangeBounds<T> for RangeFrom<&'_ T>1.28.0[src]

impl<T> SliceIndex<[T]> for RangeFrom<usize>1.15.0[src]

type Output = [T]

The output type returned by methods.

impl SliceIndex<str> for RangeFrom<usize>1.20.0[src]

Implements substring slicing with syntax &self[begin ..] or &mut self[begin ..].

Returns a slice of the given string from the byte range [begin, len). Equivalent to &self[begin .. len] or &mut self[begin .. len].

This operation is O(1).

Prior to 1.20.0, these indexing operations were still supported by direct implementation of Index and IndexMut.

Panics

Panics if begin does not point to the starting byte offset of a character (as defined by is_char_boundary), or if begin >= len.

type Output = str

The output type returned by methods.

impl<Idx> StructuralEq for RangeFrom<Idx>[src]

impl<Idx> StructuralPartialEq for RangeFrom<Idx>[src]

impl<A: Step> TrustedLen for RangeFrom<A>[src]

Auto Trait Implementations

impl<Idx> Send for RangeFrom<Idx> where
    Idx: Send

impl<Idx> Sync for RangeFrom<Idx> where
    Idx: Sync

impl<Idx> Unpin for RangeFrom<Idx> where
    Idx: Unpin

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.