Trait alloc::slice::SliceIndex
1.28.0 · source · [−]pub unsafe trait SliceIndex<T>: Sealed where
T: ?Sized, {
type Output: ?Sized;
fn get(self, slice: &T) -> Option<&Self::Output>;
fn get_mut(self, slice: &mut T) -> Option<&mut Self::Output>;
unsafe fn get_unchecked(self, slice: *const T) -> *const Self::Output;
unsafe fn get_unchecked_mut(self, slice: *mut T) -> *mut Self::Output;
fn index(self, slice: &T) -> &Self::Output;
fn index_mut(self, slice: &mut T) -> &mut Self::Output;
}Expand description
A helper trait used for indexing operations.
Implementations of this trait have to promise that if the argument
to get_(mut_)unchecked is a safe reference, then so is the result.
Required Associated Types
Required Methods
slice_index_methods)Returns a shared reference to the output at this location, if in bounds.
slice_index_methods)Returns a mutable reference to the output at this location, if in bounds.
unsafe fn get_unchecked(self, slice: *const T) -> *const Self::Output
unsafe fn get_unchecked(self, slice: *const T) -> *const Self::Output
slice_index_methods)Returns a shared reference to the output at this location, without
performing any bounds checking.
Calling this method with an out-of-bounds index or a dangling slice pointer
is undefined behavior even if the resulting reference is not used.
unsafe fn get_unchecked_mut(self, slice: *mut T) -> *mut Self::Output
unsafe fn get_unchecked_mut(self, slice: *mut T) -> *mut Self::Output
slice_index_methods)Returns a mutable reference to the output at this location, without
performing any bounds checking.
Calling this method with an out-of-bounds index or a dangling slice pointer
is undefined behavior even if the resulting reference is not used.
slice_index_methods)Returns a shared reference to the output at this location, panicking if out of bounds.
Implementations on Foreign Types
impl SliceIndex<str> for RangeTo<usize>
1.20.0 (const: unstable) · source
impl SliceIndex<str> for RangeTo<usize>
1.20.0 (const: unstable) · sourceImplements 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.
type Output = str
fn get(
self,
slice: &str
) -> Option<&<RangeTo<usize> as SliceIndex<str>>::Output>
const: unstable · source
fn get(
self,
slice: &str
) -> Option<&<RangeTo<usize> as SliceIndex<str>>::Output>
const: unstable · sourceslice_index_methods)fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeTo<usize> as SliceIndex<str>>::Output>
const: unstable · source
fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeTo<usize> as SliceIndex<str>>::Output>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeTo<usize> as SliceIndex<str>>::Output
const: unstable · source
unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeTo<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeTo<usize> as SliceIndex<str>>::Output
const: unstable · source
unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeTo<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)impl SliceIndex<str> for RangeToInclusive<usize>
1.26.0 (const: unstable) · source
impl SliceIndex<str> for RangeToInclusive<usize>
1.26.0 (const: unstable) · sourceImplements 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 + 1], except if end has the maximum
value for usize.
This operation is O(1).
Panics
Panics if end does not point to the ending byte offset of a character
(end + 1 is either a starting byte offset as defined by
is_char_boundary, or equal to len), or if end >= len.
type Output = str
fn get(
self,
slice: &str
) -> Option<&<RangeToInclusive<usize> as SliceIndex<str>>::Output>
const: unstable · source
fn get(
self,
slice: &str
) -> Option<&<RangeToInclusive<usize> as SliceIndex<str>>::Output>
const: unstable · sourceslice_index_methods)fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeToInclusive<usize> as SliceIndex<str>>::Output>
const: unstable · source
fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeToInclusive<usize> as SliceIndex<str>>::Output>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeToInclusive<usize> as SliceIndex<str>>::Output
const: unstable · source
unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeToInclusive<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeToInclusive<usize> as SliceIndex<str>>::Output
const: unstable · source
unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeToInclusive<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)fn index(
self,
slice: &str
) -> &<RangeToInclusive<usize> as SliceIndex<str>>::Output
const: unstable · source
fn index(
self,
slice: &str
) -> &<RangeToInclusive<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)fn index_mut(
self,
slice: &mut str
) -> &mut <RangeToInclusive<usize> as SliceIndex<str>>::Output
const: unstable · source
fn index_mut(
self,
slice: &mut str
) -> &mut <RangeToInclusive<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)impl<T> SliceIndex<[T]> for RangeFrom<usize>
1.15.0 (const: unstable) · source
impl<T> SliceIndex<[T]> for RangeFrom<usize>
1.15.0 (const: unstable) · sourcetype Output = [T]
fn get(self, slice: &[T]) -> Option<&[T]>
const: unstable · source
fn get(self, slice: &[T]) -> Option<&[T]>
const: unstable · sourceslice_index_methods)fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
const: unstable · source
fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
const: unstable · source
unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
const: unstable · source
unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
const: unstable · sourceslice_index_methods)impl<T> SliceIndex<[T]> for RangeInclusive<usize>
1.26.0 (const: unstable) · source
impl<T> SliceIndex<[T]> for RangeInclusive<usize>
1.26.0 (const: unstable) · sourcetype Output = [T]
fn get(self, slice: &[T]) -> Option<&[T]>
const: unstable · source
fn get(self, slice: &[T]) -> Option<&[T]>
const: unstable · sourceslice_index_methods)fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
const: unstable · source
fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
const: unstable · source
unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
const: unstable · source
unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
const: unstable · sourceslice_index_methods)impl<T> SliceIndex<[T]> for RangeToInclusive<usize>
1.26.0 (const: unstable) · source
impl<T> SliceIndex<[T]> for RangeToInclusive<usize>
1.26.0 (const: unstable) · sourcetype Output = [T]
fn get(self, slice: &[T]) -> Option<&[T]>
const: unstable · source
fn get(self, slice: &[T]) -> Option<&[T]>
const: unstable · sourceslice_index_methods)fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
const: unstable · source
fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
const: unstable · source
unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
const: unstable · source
unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
const: unstable · sourceslice_index_methods)impl<T> SliceIndex<[T]> for Range<usize>
1.15.0 (const: unstable) · source
impl<T> SliceIndex<[T]> for Range<usize>
1.15.0 (const: unstable) · sourcetype Output = [T]
fn get(self, slice: &[T]) -> Option<&[T]>
const: unstable · source
fn get(self, slice: &[T]) -> Option<&[T]>
const: unstable · sourceslice_index_methods)fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
const: unstable · source
fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
const: unstable · source
unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
const: unstable · source
unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
const: unstable · sourceslice_index_methods)impl SliceIndex<str> for RangeInclusive<usize>
1.26.0 (const: unstable) · source
impl SliceIndex<str> for RangeInclusive<usize>
1.26.0 (const: unstable) · sourceImplements substring slicing with syntax &self[begin ..= end] or &mut self[begin ..= end].
Returns a slice of the given string from the byte range
[begin, end]. Equivalent to &self [begin .. end + 1] or &mut self[begin .. end + 1], except if end has the maximum value for
usize.
This operation is O(1).
Panics
Panics if begin does not point to the starting byte offset of
a character (as defined by is_char_boundary), if end does not point
to the ending byte offset of a character (end + 1 is either a starting
byte offset or equal to len), if begin > end, or if end >= len.
type Output = str
fn get(
self,
slice: &str
) -> Option<&<RangeInclusive<usize> as SliceIndex<str>>::Output>
const: unstable · source
fn get(
self,
slice: &str
) -> Option<&<RangeInclusive<usize> as SliceIndex<str>>::Output>
const: unstable · sourceslice_index_methods)fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeInclusive<usize> as SliceIndex<str>>::Output>
const: unstable · source
fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeInclusive<usize> as SliceIndex<str>>::Output>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeInclusive<usize> as SliceIndex<str>>::Output
const: unstable · source
unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeInclusive<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeInclusive<usize> as SliceIndex<str>>::Output
const: unstable · source
unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeInclusive<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)fn index(
self,
slice: &str
) -> &<RangeInclusive<usize> as SliceIndex<str>>::Output
const: unstable · source
fn index(
self,
slice: &str
) -> &<RangeInclusive<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)fn index_mut(
self,
slice: &mut str
) -> &mut <RangeInclusive<usize> as SliceIndex<str>>::Output
const: unstable · source
fn index_mut(
self,
slice: &mut str
) -> &mut <RangeInclusive<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)impl<T> SliceIndex<[T]> for RangeTo<usize>
1.15.0 (const: unstable) · source
impl<T> SliceIndex<[T]> for RangeTo<usize>
1.15.0 (const: unstable) · sourcetype Output = [T]
fn get(self, slice: &[T]) -> Option<&[T]>
const: unstable · source
fn get(self, slice: &[T]) -> Option<&[T]>
const: unstable · sourceslice_index_methods)fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
const: unstable · source
fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
const: unstable · source
unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
const: unstable · source
unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
const: unstable · sourceslice_index_methods)impl<T> SliceIndex<[T]> for (Bound<usize>, Bound<usize>)
1.53.0 · source
impl<T> SliceIndex<[T]> for (Bound<usize>, Bound<usize>)
1.53.0 · sourcetype Output = [T]
fn get(
self,
slice: &[T]
) -> Option<&<(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::Output>
source
fn get(
self,
slice: &[T]
) -> Option<&<(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::Output>
sourceslice_index_methods)fn get_mut(
self,
slice: &mut [T]
) -> Option<&mut <(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::Output>
source
fn get_mut(
self,
slice: &mut [T]
) -> Option<&mut <(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::Output>
sourceslice_index_methods)unsafe fn get_unchecked(
self,
slice: *const [T]
) -> *const <(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::Output
source
unsafe fn get_unchecked(
self,
slice: *const [T]
) -> *const <(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::Output
sourceslice_index_methods)unsafe fn get_unchecked_mut(
self,
slice: *mut [T]
) -> *mut <(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::Output
source
unsafe fn get_unchecked_mut(
self,
slice: *mut [T]
) -> *mut <(Bound<usize>, Bound<usize>) as SliceIndex<[T]>>::Output
sourceslice_index_methods)impl SliceIndex<str> for RangeFull
1.20.0 (const: unstable) · source
impl SliceIndex<str> for RangeFull
1.20.0 (const: unstable) · sourceImplements substring slicing with syntax &self[..] or &mut self[..].
Returns a slice of the whole string, i.e., returns &self or &mut self. Equivalent to &self[0 .. len] or &mut self[0 .. len]. Unlike
other indexing operations, this can never panic.
This operation is O(1).
Prior to 1.20.0, these indexing operations were still supported by
direct implementation of Index and IndexMut.
Equivalent to &self[0 .. len] or &mut self[0 .. len].
type Output = str
fn get(self, slice: &str) -> Option<&<RangeFull as SliceIndex<str>>::Output>
const: unstable · source
fn get(self, slice: &str) -> Option<&<RangeFull as SliceIndex<str>>::Output>
const: unstable · sourceslice_index_methods)fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeFull as SliceIndex<str>>::Output>
const: unstable · source
fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeFull as SliceIndex<str>>::Output>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeFull as SliceIndex<str>>::Output
const: unstable · source
unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeFull as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeFull as SliceIndex<str>>::Output
const: unstable · source
unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeFull as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)impl SliceIndex<str> for RangeFrom<usize>
1.20.0 (const: unstable) · source
impl SliceIndex<str> for RangeFrom<usize>
1.20.0 (const: unstable) · sourceImplements 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
fn get(
self,
slice: &str
) -> Option<&<RangeFrom<usize> as SliceIndex<str>>::Output>
const: unstable · source
fn get(
self,
slice: &str
) -> Option<&<RangeFrom<usize> as SliceIndex<str>>::Output>
const: unstable · sourceslice_index_methods)fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeFrom<usize> as SliceIndex<str>>::Output>
const: unstable · source
fn get_mut(
self,
slice: &mut str
) -> Option<&mut <RangeFrom<usize> as SliceIndex<str>>::Output>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeFrom<usize> as SliceIndex<str>>::Output
const: unstable · source
unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <RangeFrom<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeFrom<usize> as SliceIndex<str>>::Output
const: unstable · source
unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <RangeFrom<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)impl SliceIndex<str> for Range<usize>
1.20.0 (const: unstable) · source
impl SliceIndex<str> for Range<usize>
1.20.0 (const: unstable) · sourceImplements substring slicing with syntax &self[begin .. end] or &mut self[begin .. end].
Returns a slice of the given string from the byte range
[begin, 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 begin or end does not point to the starting byte offset of
a character (as defined by is_char_boundary), if begin > end, or if
end > len.
Examples
let s = "Löwe 老虎 Léopard";
assert_eq!(&s[0 .. 1], "L");
assert_eq!(&s[1 .. 9], "öwe 老");
// these will panic:
// byte 2 lies within `ö`:
// &s[2 ..3];
// byte 8 lies within `老`
// &s[1 .. 8];
// byte 100 is outside the string
// &s[3 .. 100];type Output = str
fn get(self, slice: &str) -> Option<&<Range<usize> as SliceIndex<str>>::Output>
const: unstable · source
fn get(self, slice: &str) -> Option<&<Range<usize> as SliceIndex<str>>::Output>
const: unstable · sourceslice_index_methods)fn get_mut(
self,
slice: &mut str
) -> Option<&mut <Range<usize> as SliceIndex<str>>::Output>
const: unstable · source
fn get_mut(
self,
slice: &mut str
) -> Option<&mut <Range<usize> as SliceIndex<str>>::Output>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <Range<usize> as SliceIndex<str>>::Output
const: unstable · source
unsafe fn get_unchecked(
self,
slice: *const str
) -> *const <Range<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <Range<usize> as SliceIndex<str>>::Output
const: unstable · source
unsafe fn get_unchecked_mut(
self,
slice: *mut str
) -> *mut <Range<usize> as SliceIndex<str>>::Output
const: unstable · sourceslice_index_methods)impl<T> SliceIndex<[T]> for RangeFull
1.15.0 (const: unstable) · source
impl<T> SliceIndex<[T]> for RangeFull
1.15.0 (const: unstable) · sourcetype Output = [T]
fn get(self, slice: &[T]) -> Option<&[T]>
const: unstable · source
fn get(self, slice: &[T]) -> Option<&[T]>
const: unstable · sourceslice_index_methods)fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
const: unstable · source
fn get_mut(self, slice: &mut [T]) -> Option<&mut [T]>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
const: unstable · source
unsafe fn get_unchecked(self, slice: *const [T]) -> *const [T]
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
const: unstable · source
unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut [T]
const: unstable · sourceslice_index_methods)impl<T> SliceIndex<[T]> for usize
1.15.0 (const: unstable) · source
impl<T> SliceIndex<[T]> for usize
1.15.0 (const: unstable) · sourcetype Output = T
fn get(self, slice: &[T]) -> Option<&T>
const: unstable · source
fn get(self, slice: &[T]) -> Option<&T>
const: unstable · sourceslice_index_methods)fn get_mut(self, slice: &mut [T]) -> Option<&mut T>
const: unstable · source
fn get_mut(self, slice: &mut [T]) -> Option<&mut T>
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked(self, slice: *const [T]) -> *const T
const: unstable · source
unsafe fn get_unchecked(self, slice: *const [T]) -> *const T
const: unstable · sourceslice_index_methods)unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut T
const: unstable · source
unsafe fn get_unchecked_mut(self, slice: *mut [T]) -> *mut T
const: unstable · sourceslice_index_methods)