Struct std::ops::RangeFrom1.0.0 [] [src]

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

A range which is only bounded below: { x | start <= x }. Use start.. for its shorthand.

See the contains() method for its characterization.

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

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

    let arr = [0, 1, 2, 3];
    assert_eq!(arr[ .. ], [0,1,2,3]);
    assert_eq!(arr[ ..3], [0,1,2  ]);
    assert_eq!(arr[1.. ], [  1,2,3]);  // RangeFrom
    assert_eq!(arr[1..3], [  1,2  ]);
}Run

Fields

The lower bound of the range (inclusive).

Methods

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

Unstable (range_contains #32311)

: recently added as per RFC

Examples

#![feature(range_contains)]
fn main() {
    assert!( ! (3..).contains(2));
    assert!(   (3..).contains(3));
    assert!(   (3..).contains(1_000_000_000));
}Run

impl<A> RangeFrom<A> where A: Step
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Unstable (step_by #27741)

: recent addition

Creates an iterator starting at the same point, but stepping by the given amount at each iteration.

Examples

#![feature(step_by)]
fn main() {
    let result: Vec<_> = (0..).step_by(2).take(5).collect();
    assert_eq!(result, vec![0, 2, 4, 6, 8]);
}Run

Trait Implementations

impl<T> RangeArgument<T> for RangeFrom<T>
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Unstable (collections_range #30877)

: waiting for dust to settle on inclusive ranges

Start index (inclusive) Read more

Unstable (collections_range #30877)

: waiting for dust to settle on inclusive ranges

End index (exclusive) Read more

impl<A> FusedIterator for RangeFrom<A> where A: Step, &'a A: Add<&'a A>, &'a A::Output == A
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impl<Idx> Debug for RangeFrom<Idx> where Idx: Debug
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Formats the value using the given formatter.

impl<A> Iterator for RangeFrom<A> where A: Step, &'a A: Add<&'a A>, &'a A::Output == A
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The type of the elements being iterated over.

Advances the iterator and returns the next value. Read more

Returns the bounds on the remaining length of the iterator. Read more

Consumes the iterator, counting the number of iterations and returning it. Read more

Consumes the iterator, returning the last element. Read more

Returns the nth element of the iterator. Read more

Takes two iterators and creates a new iterator over both in sequence. Read more

'Zips up' two iterators into a single iterator of pairs. Read more

Takes a closure and creates an iterator which calls that closure on each element. Read more

Creates an iterator which uses a closure to determine if an element should be yielded. Read more

Creates an iterator that both filters and maps. Read more

Creates an iterator which gives the current iteration count as well as the next value. Read more

Creates an iterator which can use peek to look at the next element of the iterator without consuming it. Read more

Creates an iterator that [skip()]s elements based on a predicate. Read more

Creates an iterator that yields elements based on a predicate. Read more

Creates an iterator that skips the first n elements. Read more

Creates an iterator that yields its first n elements. Read more

An iterator adaptor similar to [fold()] that holds internal state and produces a new iterator. Read more

Creates an iterator that works like map, but flattens nested structure. Read more

Creates an iterator which ends after the first [None]. Read more

Do something with each element of an iterator, passing the value on. Read more

Borrows an iterator, rather than consuming it. Read more

Transforms an iterator into a collection. Read more

Consumes an iterator, creating two collections from it. Read more

An iterator adaptor that applies a function, producing a single, final value. Read more

Tests if every element of the iterator matches a predicate. Read more

Tests if any element of the iterator matches a predicate. Read more

Searches for an element of an iterator that satisfies a predicate. Read more

Searches for an element in an iterator, returning its index. Read more

Searches for an element in an iterator from the right, returning its index. Read more

Returns the maximum element of an iterator. Read more

Returns the minimum element of an iterator. Read more

Returns the element that gives the maximum value from the specified function. Read more

Unstable (iter_max_by #36105)

Returns the element that gives the maximum value with respect to the specified comparison function. Read more

Returns the element that gives the minimum value from the specified function. Read more

Unstable (iter_min_by #36105)

Returns the element that gives the minimum value with respect to the specified comparison function. Read more

Reverses an iterator's direction. Read more

Converts an iterator of pairs into a pair of containers. Read more

Creates an iterator which [clone()]s all of its elements. Read more

Repeats an iterator endlessly. Read more

Sums the elements of an iterator. Read more

Iterates over the entire iterator, multiplying all the elements Read more

Lexicographically compares the elements of this Iterator with those of another. Read more

Lexicographically compares the elements of this Iterator with those of another. Read more

Determines if the elements of this Iterator are equal to those of another. Read more

Determines if the elements of this Iterator are unequal to those of another. Read more

Determines if the elements of this Iterator are lexicographically less than those of another. Read more

Determines if the elements of this Iterator are lexicographically less or equal to those of another. Read more

Determines if the elements of this Iterator are lexicographically greater than those of another. Read more

Determines if the elements of this Iterator are lexicographically greater than or equal to those of another. Read more

impl<Idx> PartialEq<RangeFrom<Idx>> for RangeFrom<Idx> where Idx: PartialEq<Idx>
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This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

impl<T> SliceIndex<T> for RangeFrom<usize>
1.13.0
[src]

Unstable (slice_get_slice #35729)

The output type returned by methods.

Unstable (slice_get_slice #35729)

Returns a shared reference to the output at this location, if in bounds. Read more

Unstable (slice_get_slice #35729)

Returns a mutable reference to the output at this location, if in bounds. Read more

Unstable (slice_get_slice #35729)

Returns a shared reference to the output at this location, without performing any bounds checking. Read more

Unstable (slice_get_slice #35729)

Returns a mutable reference to the output at this location, without performing any bounds checking. Read more

Unstable (slice_get_slice #35729)

Returns a shared reference to the output at this location, panicking if out of bounds. Read more

Unstable (slice_get_slice #35729)

Returns a mutable reference to the output at this location, panicking if out of bounds. Read more

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

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl<Idx> Hash for RangeFrom<Idx> where Idx: Hash
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Feeds this value into the state given, updating the hasher as necessary.

Feeds a slice of this type into the state provided.

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