RangeTo in core::ops - Rust (original) (raw)
Struct RangeTo
1.6.0 · Source
pub struct RangeTo<Idx> {
pub end: Idx,
}Expand description
A range only bounded exclusively above (..end).
The RangeTo ..end contains all values with x < end. It cannot serve as an Iterator because it doesn’t have a starting point.
§Examples
The ..end syntax is a RangeTo:
assert_eq!((..5), std::ops::RangeTo { end: 5 });It does not have an IntoIterator implementation, so you can’t use it in a for loop directly. This won’t compile:
// error[E0277]: the trait bound `std::ops::RangeTo<{integer}>:
// std::iter::Iterator` is not satisfied
for i in ..5 {
// ...
}When used as a slicing index, RangeTo produces a slice of all array elements before the index indicated by end.
let arr = [0, 1, 2, 3, 4];
assert_eq!(arr[ .. ], [0, 1, 2, 3, 4]);
assert_eq!(arr[ .. 3], [0, 1, 2 ]); // This is a `RangeTo`
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 ]);The upper bound of the range (exclusive).
1.35.0 · Source
Returns true if item is contained in the range.
§Examples
assert!( (..5).contains(&-1_000_000_000));
assert!( (..5).contains(&4));
assert!(!(..5).contains(&5));
assert!( (..1.0).contains(&0.5));
assert!(!(..1.0).contains(&f32::NAN));
assert!(!(..f32::NAN).contains(&0.5));The returned type after indexing.
Performs the indexing (container[index]) operation. Read more
🔬This is a nightly-only experimental API. (range_into_bounds #136903)
Convert this range into the start and end bounds. Returns (start_bound, end_bound). Read more
🔬This is a nightly-only experimental API. (range_into_bounds #136903)
Compute the intersection of self and other. Read more
🔬This is a nightly-only experimental API. (one_sided_range #69780)
An internal-only helper function for split_off andsplit_off_mut that returns the bound of the one-sided range.
Tests for self and other values to be equal, and is used by ==.
Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
Returns true if item is contained in the range. Read more
🔬This is a nightly-only experimental API. (range_bounds_is_empty #137300)
Returns true if the range contains no items. One-sided ranges (RangeFrom, etc) always return false. Read more
Returns true if item is contained in the range. Read more
🔬This is a nightly-only experimental API. (range_bounds_is_empty #137300)
Returns true if the range contains no items. One-sided ranges (RangeFrom, etc) always return false. Read more
The methods index and index_mut panic if the end of the range is out of bounds.
The output type returned by methods.
🔬This is a nightly-only experimental API. (slice_index_methods)
Returns a shared reference to the output at this location, if in bounds.
🔬This is a nightly-only experimental API. (slice_index_methods)
Returns a mutable reference to the output at this location, if in bounds.
🔬This is a nightly-only experimental API. (slice_index_methods)
Returns a pointer to the output at this location, without performing any bounds checking. Read more
🔬This is a nightly-only experimental API. (slice_index_methods)
Returns a mutable pointer to the output at this location, without performing any bounds checking. Read more
🔬This is a nightly-only experimental API. (slice_index_methods)
Returns a shared reference to the output at this location, panicking if out of bounds.
🔬This is a nightly-only experimental API. (slice_index_methods)
Returns a mutable reference to the output at this location, panicking if out of bounds.
Implements substring slicing with syntax &self[.. end] or &mut self[.. end].
Returns a slice of the given string from the byte range [0, end). Equivalent to &self[0 .. end] or &mut self[0 .. end].
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 end does not point to the starting byte offset of a character (as defined by is_char_boundary), or if end > len.
The output type returned by methods.
🔬This is a nightly-only experimental API. (slice_index_methods)
Returns a shared reference to the output at this location, if in bounds.
🔬This is a nightly-only experimental API. (slice_index_methods)
Returns a mutable reference to the output at this location, if in bounds.
🔬This is a nightly-only experimental API. (slice_index_methods)
Returns a pointer to the output at this location, without performing any bounds checking. Read more
🔬This is a nightly-only experimental API. (slice_index_methods)
Returns a mutable pointer to the output at this location, without performing any bounds checking. Read more
🔬This is a nightly-only experimental API. (slice_index_methods)
Returns a shared reference to the output at this location, panicking if out of bounds.
🔬This is a nightly-only experimental API. (slice_index_methods)
Returns a mutable reference to the output at this location, panicking if out of bounds.