GeezerVison is showing doc.rust-lang.org — RangeTo in std::ops - Rust pub struct RangeTo<Idx> {
pub end: Idx,
}
Expand descriptionA 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 ]);
Fields§§end: IdxThe upper bound of the range (exclusive).
Implementations§
1.35.0 (const: unstable) · SourceReturns 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));
Trait Implementations§
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
The returned type after indexing.
Performs the indexing ( container[index]) operation. Read more
Performs the mutable 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 and
split_off_mut that returns the bound of the one-sided range.
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 more1.28.0 (const: unstable) · Source§If you need to use this implementation where T is unsized,
consider using the RangeBounds impl for a 2-tuple of Bound<&T>,
i.e. replace ..end with (Bound::Unbounded, Bound::Excluded(end)).
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 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. 1.15.0 (const: unstable) · Source§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. 1.20.0 (const: unstable) · Source§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. Auto Trait Implementations§Blanket Implementations§
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
🔬This is a nightly-only experimental API. (clone_to_uninit #126799) Performs copy-assignment from self to dest. Read more
Returns the argument unchanged.
Calls U::from(self).
That is, this conversion is whatever the implementation of
From<T> for U chooses to do.
The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion. |