1.0.0[][src]Struct std::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: Currently, no overflow checking is done for the Iterator implementation; if you use an integer range and the integer overflows, it might panic in debug mode or create an endless loop in release mode. This overflow behavior might change in the future.

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> RangeFrom<Idx> where
    Idx: PartialOrd<Idx>, 
[src]

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

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

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

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

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

impl Index<RangeFrom<usize>> for String[src]

type Output = str

The returned type after indexing.

impl IndexMut<RangeFrom<usize>> for String1.3.0[src]

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

type Item = A

The type of the elements being iterated over.

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

Auto Trait Implementations

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

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

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

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<I> IntoIterator for I where
    I: Iterator
[src]

type Item = <I as Iterator>::Item

The type of the elements being iterated over.

type IntoIter = I

Which kind of iterator are we turning this into?

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

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.