devela::sys::mem

Struct Slice

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pub struct Slice<T>(/* private fields */);
Expand description

Slice-related operations, most of them const.

It is designed as a utility namespace and does not hold or wrap data itself. Instead, it operates on slices provided directly as arguments to its static methods.

See also: ExtSlice, Mem, Ptr.

Implementations§

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impl<T> Slice<T>

§core::slice namespaced methods

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pub const fn from_ref(s: &T) -> &[T]

Converts a reference to T into a slice of length 1 (without copying).

See core::slice::from_ref.

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pub const fn from_mut(s: &mut T) -> &mut [T]

Converts a reference to T into a slice of length 1 (without copying).

See core::slice::from_mut.

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pub const unsafe fn from_raw_parts<'a>(data: *const T, len: usize) -> &'a [T]

Available on crate feature unsafe_slice only.

Forms a shared slice from a pointer and a length.

§Safety

See core::slice::from_raw_parts

See also Ptr::slice_from_raw_parts.

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pub const unsafe fn from_raw_parts_mut<'a>( data: *mut T, len: usize, ) -> &'a mut [T]

Available on crate feature unsafe_slice only.

Forms an exclusive slice from a pointer and a length.

§Safety

See core::slice::from_raw_parts_mut.

See also Ptr::slice_from_raw_parts_mut.

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impl<T> Slice<T>

§Methods for shared subslicing using index-based splitting.

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pub const fn range_to(slice: &[T], end: usize) -> &[T]

Returns a subslice up to the given end index.

Equivalent to &slice[..end].

§Panics

Panics if end > slice.len().

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pub const fn range_from(slice: &[T], start: usize) -> &[T]

Returns a subslice starting from the given start index.

Equivalent to &slice[start..].

§Panics

Panics if start > slice.len().

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pub const fn range(slice: &[T], start: usize, end: usize) -> &[T]

Returns a subslice from start (inclusive) to end (exclusive).

Equivalent to &slice[start..end].

§Panics

Panics if start > len or end > slice.len().

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pub const fn take_first(slice: &[T], n: usize) -> &[T]

Returns the first n elements of the slice.

Equivalent to &slice[..n].

§Panics

Panics if n > slice.len().

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pub const fn take_last(slice: &[T], n: usize) -> &[T]

Returns the last n elements of the slice.

Equivalent to &slice[slice.len() - n..].

§Panics

Panics if n > slice.len().

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pub const fn take_omit_last(slice: &[T], n: usize) -> &[T]

Returns the slice omitting the last n elements.

Equivalent to &slice[..slice.len() - n].

§Panics

Panics if n > slice.len().

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pub const fn range_to_checked(slice: &[T], end: usize) -> Option<&[T]>

Returns a subslice up to the given end index.

Equivalent to &slice[..end].

Returns None if end > slice.len().

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pub const fn range_from_checked(slice: &[T], start: usize) -> Option<&[T]>

Returns a subslice starting from the given start index.

Equivalent to &slice[start..].

Returns None if start > slice.len().

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pub const fn range_checked( slice: &[T], start: usize, end: usize, ) -> Option<&[T]>

Returns a subslice from start (inclusive) to end (exclusive).

Equivalent to &slice[start..end].

Returns None if start > slice.len() or end > slice.len().

§Features

This method makes use of of the unsafe_slice feature is enabled.

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pub const fn take_first_checked(slice: &[T], n: usize) -> Option<&[T]>

Returns the first n elements of the slice.

Equivalent to &slice[..n].

Returns None if n > slice.len().

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pub const fn take_last_checked(slice: &[T], n: usize) -> Option<&[T]>

Returns the last n elements of the slice.

Equivalent to &slice[slice.len() - n..].

Returns None if n > slice.len().

§Features

This method makes use of of the unsafe_slice feature is enabled.

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pub const fn take_omit_last_checked(slice: &[T], n: usize) -> Option<&[T]>

Returns the slice omitting the last n elements.

Equivalent to &slice[..slice.len() - n].

Returns None if n > slice.len().

§Features

This method makes use of of the unsafe_slice feature is enabled.

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impl<T> Slice<T>

§Methods for exclusive subslicing using index-based splitting.

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pub const fn range_to_mut(slice: &mut [T], end: usize) -> &mut [T]

Returns an exclusive subslice up to the given end index.

Equivalent to &mut slice[..end].

§Panics

Panics if end > slice.len().

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pub const fn range_from_mut(slice: &mut [T], start: usize) -> &mut [T]

Returns an exclusive subslice starting from the given start index.

Equivalent to &mut slice[start..].

§Panics

Panics if start > slice.len().

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pub const fn range_mut(slice: &mut [T], start: usize, end: usize) -> &mut [T]

Returns an exclusive subslice from start (inclusive) to end (exclusive).

Equivalent to &mut slice[start..end].

§Panics

Panics if start > slice.len() or end > slice.len().

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pub const fn take_first_mut(slice: &mut [T], n: usize) -> &mut [T]

Returns the first n elements of the exclusive slice.

Equivalent to &mut slice[..n].

§Panics

Panics if n > slice.len().

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pub const fn take_last_mut(slice: &mut [T], n: usize) -> &mut [T]

Returns the last n elements of the exclusive slice.

Equivalent to &mut slice[slice.len() - n..].

§Panics

Panics if n > slice.len().

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pub const fn take_omit_last_mut(slice: &mut [T], n: usize) -> &mut [T]

Returns the exclusive slice omitting the last n elements.

Equivalent to &mut slice[..slice.len() - n].

§Panics

Panics if n > slice.len().

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pub const fn range_to_mut_checked( slice: &mut [T], end: usize, ) -> Option<&mut [T]>

Returns a subslice up to the given end index.

Equivalent to &mut slice[..end].

Returns None if end > slice.len().

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pub const fn range_from_mut_checked( slice: &mut [T], start: usize, ) -> Option<&mut [T]>

Returns a subslice starting from the given start index.

Equivalent to &mut slice[start..].

Returns None if start > slice.len().

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pub const fn range_mut_checked( slice: &mut [T], start: usize, end: usize, ) -> Option<&mut [T]>

Returns a subslice from start (inclusive) to end (exclusive).

Equivalent to &mut slice[start..end].

Returns None if start > slice.len() or end > slice.len().

§Features

This method makes use of of the unsafe_slice feature is enabled.

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pub const fn take_first_mut_checked( slice: &mut [T], n: usize, ) -> Option<&mut [T]>

Returns the first n elements of the slice.

Equivalent to &mut slice[..n].

Returns None if n > slice.len().

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pub const fn take_last_mut_checked( slice: &mut [T], n: usize, ) -> Option<&mut [T]>

Returns the last n elements of the slice.

Equivalent to &mut slice[slice.len() - n..].

Returns None if n > slice.len().

§Features

This method makes use of of the unsafe_slice feature is enabled.

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pub const fn take_omit_last_mut_checked( slice: &mut [T], n: usize, ) -> Option<&mut [T]>

Returns the slice omitting the last n elements.

Equivalent to &mut slice[..slice.len() - n].

Returns None if n > slice.len().

§Features

This method makes use of of the unsafe_slice feature is enabled.

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impl<T> Slice<T>

§Methods for splitting.

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pub const fn lsplit(slice: &[T], len: usize) -> &[T]

Returns the leftmost sub-slice with the given maximum len.

If len > self.len() it returns the full slice.

§Example
let v = [1, 2, 3, 4, 5, 6];
assert_eq!(Slice::lsplit(&v, 3), &[1, 2, 3]);
assert_eq!(Slice::lsplit(&v, 0), &[] as &[i32]);
assert_eq!(Slice::lsplit(&v, 10), &[1, 2, 3, 4, 5, 6]);
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pub const fn lsplit_mut(slice: &mut [T], len: usize) -> &mut [T]

Returns the leftmost exclusive sub-slice with the given maximum len.

If left_len > slice.len() it returns the full slice.

§Example
let mut v = [1, 2, 3, 4, 5, 6];
assert_eq!(Slice::lsplit_mut(&mut v, 3), &mut [1, 2, 3]);
assert_eq!(Slice::lsplit_mut(&mut v, 0), &mut [] as &mut [i32]);
assert_eq!(Slice::lsplit_mut(&mut v, 10), &mut [1, 2, 3, 4, 5, 6]);

See also Slice::lsplit_mut.

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pub const fn rsplit(slice: &[T], len: usize) -> &[T]

Returns the rightmost sub-slice with the given maximum len.

If left_len > slice.len() it returns the full slice.

§Example
let v = [1, 2, 3, 4, 5, 6];
assert_eq!(Slice::rsplit(&v, 3), &[4, 5, 6]);
assert_eq!(Slice::rsplit(&v, 0), &[] as &[i32]);
assert_eq!(Slice::rsplit(&v, 10), &[1, 2, 3, 4, 5, 6]);
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pub const fn rsplit_mut(slice: &mut [T], len: usize) -> &mut [T]

Returns the rightmost mutable sub-slice with the given maximum len.

If left_len > slice.len() it returns the full slice.

§Example
let mut v = [1, 2, 3, 4, 5, 6];
assert_eq!(Slice::rsplit_mut(&mut v, 3), &mut [4, 5, 6]);
assert_eq!(Slice::rsplit_mut(&mut v, 0), &mut [] as &mut [i32]);
assert_eq!(Slice::rsplit_mut(&mut v, 10), &mut [1, 2, 3, 4, 5, 6]);

See also Slice::lsplit_mut.

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pub const fn msplit_left(slice: &[T], len: usize) -> &[T]

Returns the middle sub-slice with the given maximum len and a left bias.

In case of a non-perfect middle split, it will have one character more on the left.

If len > slice.len() returns the full slice.

§Example
let v = [1, 2, 3, 4, 5, 6];
assert_eq!(Slice::msplit_left(&v, 0), &[] as &[i32]);
assert_eq!(Slice::msplit_left(&v, 1), &[3]);
assert_eq!(Slice::msplit_left(&v, 2), &[3, 4]);
assert_eq!(Slice::msplit_left(&v, 3), &[2, 3, 4]);
assert_eq!(Slice::msplit_left(&v, 4), &[2, 3, 4, 5]);
assert_eq!(Slice::msplit_left(&v, 5), &[1, 2, 3, 4, 5]);
assert_eq!(Slice::msplit_left(&v, 10), &[1, 2, 3, 4, 5, 6]);

See also Slice::msplit_right.

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pub const fn msplit_left_mut(slice: &mut [T], len: usize) -> &mut [T]

Returns the middle exclusive sub-slice with the given maximum len and a left bias.

In case of a non-perfect middle split, it will have one character more on the left.

If len > slice.len() returns the full slice.

§Example
let mut v = [1, 2, 3, 4, 5, 6];
assert_eq!(Slice::msplit_left_mut(&mut v, 0), &mut [] as &mut [i32]);
assert_eq!(Slice::msplit_left_mut(&mut v, 1), &mut [3]);
assert_eq!(Slice::msplit_left_mut(&mut v, 2), &mut [3, 4]);
assert_eq!(Slice::msplit_left_mut(&mut v, 3), &mut [2, 3, 4]);
assert_eq!(Slice::msplit_left_mut(&mut v, 4), &mut [2, 3, 4, 5]);
assert_eq!(Slice::msplit_left_mut(&mut v, 5), &mut [1, 2, 3, 4, 5]);
assert_eq!(Slice::msplit_left_mut(&mut v, 10), &mut [1, 2, 3, 4, 5, 6]);

See also Slice::msplit_right_mut.

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pub const fn msplit_right(slice: &[T], len: usize) -> &[T]

Returns the middle sub-slice with the given maximum len and a right bias.

In case of a non-perfect middle split, it will have one character more on the right.

If len > slice.len() returns the full slice.

§Example
let v = [1, 2, 3, 4, 5, 6];
assert_eq!(Slice::msplit_right(&v, 0), &[] as &[i32]);
assert_eq!(Slice::msplit_right(&v, 1), &[4]);
assert_eq!(Slice::msplit_right(&v, 2), &[3, 4]);
assert_eq!(Slice::msplit_right(&v, 3), &[3, 4, 5]);
assert_eq!(Slice::msplit_right(&v, 4), &[2, 3, 4, 5]);
assert_eq!(Slice::msplit_right(&v, 5), &[2, 3, 4, 5, 6]);
assert_eq!(Slice::msplit_right(&v, 10), &[1, 2, 3, 4, 5, 6]);

See also Slice::msplit_left.

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pub const fn msplit_right_mut(slice: &mut [T], len: usize) -> &mut [T]

Returns the middle exclusive sub-slice with the given maximum len and a right bias.

In case of a non-perfect middle split, it will have one character more on the right.

If len > slice.len() returns the full slice.

§Example
let mut v = [1, 2, 3, 4, 5, 6];
assert_eq!(Slice::msplit_right_mut(&mut v, 0), &mut [] as &mut[i32]);
assert_eq!(Slice::msplit_right_mut(&mut v, 1), &mut [4]);
assert_eq!(Slice::msplit_right_mut(&mut v, 2), &mut [3, 4]);
assert_eq!(Slice::msplit_right_mut(&mut v, 3), &mut [3, 4, 5]);
assert_eq!(Slice::msplit_right_mut(&mut v, 4), &mut [2, 3, 4, 5]);
assert_eq!(Slice::msplit_right_mut(&mut v, 5), &mut [2, 3, 4, 5, 6]);
assert_eq!(Slice::msplit_right_mut(&mut v, 10), &mut [1, 2, 3, 4, 5, 6]);

See also Slice::msplit_left_mut.

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impl Slice<u8>

§Methods for slices of bytes.

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pub const fn trim_leading_bytes(slice: &[u8], byte: u8) -> &[u8]

Returns a subslice without the given leading bytes.

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pub const fn replace_leading_bytes(slice: &mut [u8], old: u8, new: u8)

Replaces the old leading byte with a new byte.

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impl Slice<u8>

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pub const fn eq(a: &[u8], b: &[u8]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<u16>

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pub const fn eq(a: &[u16], b: &[u16]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<u32>

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pub const fn eq(a: &[u32], b: &[u32]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<u64>

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pub const fn eq(a: &[u64], b: &[u64]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<u128>

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pub const fn eq(a: &[u128], b: &[u128]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<usize>

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pub const fn eq(a: &[usize], b: &[usize]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<i8>

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pub const fn eq(a: &[i8], b: &[i8]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<i16>

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pub const fn eq(a: &[i16], b: &[i16]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<i32>

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pub const fn eq(a: &[i32], b: &[i32]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<i64>

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pub const fn eq(a: &[i64], b: &[i64]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<i128>

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pub const fn eq(a: &[i128], b: &[i128]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<isize>

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pub const fn eq(a: &[isize], b: &[isize]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<f32>

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pub const fn eq(a: &[f32], b: &[f32]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<f64>

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pub const fn eq(a: &[f64], b: &[f64]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<bool>

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pub const fn eq(a: &[bool], b: &[bool]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<char>

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pub const fn eq(a: &[char], b: &[char]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<f16>

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pub const fn eq(a: &[f16], b: &[f16]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<f128>

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pub const fn eq(a: &[f128], b: &[f128]) -> bool

Checks the equality of two slices of primitives in compile-time.

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impl Slice<&str>

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pub const fn eq(a: &str, b: &str) -> bool

Checks the equality of two string slices in compile-time.

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impl Slice<&[&str]>

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pub const fn eq(a: &[&str], b: &[&str]) -> bool

Checks the equality of two slices of string slices in compile-time.

Auto Trait Implementations§

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impl<T> Freeze for Slice<T>

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impl<T> RefUnwindSafe for Slice<T>
where T: RefUnwindSafe,

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impl<T> Send for Slice<T>
where T: Send,

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impl<T> Sync for Slice<T>
where T: Sync,

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impl<T> Unpin for Slice<T>
where T: Unpin,

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impl<T> UnwindSafe for Slice<T>
where T: UnwindSafe,

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> ArchivePointee for T

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type ArchivedMetadata = ()

The archived version of the pointer metadata for this type.
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fn pointer_metadata( _: &<T as ArchivePointee>::ArchivedMetadata, ) -> <T as Pointee>::Metadata

Converts some archived metadata to the pointer metadata for itself.
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> ByteSized for T

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const BYTE_ALIGN: usize = _

The alignment of this type in bytes.
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const BYTE_SIZE: usize = _

The size of this type in bytes.
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fn byte_align(&self) -> usize

Returns the alignment of this type in bytes.
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fn byte_size(&self) -> usize

Returns the size of this type in bytes. Read more
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fn ptr_size_ratio(&self) -> [usize; 2]

Returns the size ratio between Ptr::BYTES and BYTE_SIZE. Read more
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where T: ?Sized,

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fn chain<F>(self, f: F) -> R
where F: FnOnce(Self) -> R, Self: Sized,

Chain a function which takes the parameter by value.
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where F: FnOnce(&Self) -> R,

Chain a function which takes the parameter by shared reference.
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where F: FnOnce(&mut Self) -> R,

Chain a function which takes the parameter by exclusive reference.
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impl<T> ExtAny for T
where T: Any + ?Sized,

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fn type_id() -> TypeId

Returns the TypeId of Self. Read more
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where Self: Sized,

Upcasts &self as &dyn Any. Read more
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Upcasts &mut self as &mut dyn Any. Read more
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where Self: Sized,

Upcasts Box<self> as Box<dyn Any>. Read more
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fn downcast_ref<T: 'static>(&self) -> Option<&T>

Available on crate feature unsafe_layout only.
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Available on crate feature unsafe_layout only.
Returns some exclusive reference to the inner value if it is of type T. Read more
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impl<T> ExtMem for T
where T: ?Sized,

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const NEEDS_DROP: bool = _

Know whether dropping values of this type matters, in compile-time.
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Returns the minimum alignment of the type in bytes. Read more
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Returns the alignment of the pointed-to value in bytes. Read more
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Returns the size of a type in bytes. Read more
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where Self: Copy,

Bitwise-copies a value. Read more
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fn mem_drop(self)
where Self: Sized,

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where Self: Sized,

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where Self: Default,

Replaces self with its default value, returning the previous value of self. Read more
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fn mem_swap(&mut self, other: &mut Self)
where Self: Sized,

Swaps the value of self and other without deinitializing either one. Read more
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unsafe fn mem_zeroed<T>() -> T

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Returns the value of type T represented by the all-zero byte-pattern. Read more
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where Self: Sync + Unpin,

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where Self: Sync + Unpin,

Available on crate feature unsafe_slice only.
View a Sync + Unpin self as &mut [u8]. Read more
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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T, N1, N2> Niching<NichedOption<T, N1>> for N2
where T: SharedNiching<N1, N2>, N1: Niching<T>, N2: Niching<T>,

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unsafe fn is_niched(niched: *const NichedOption<T, N1>) -> bool

Returns whether the given value has been niched. Read more
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fn resolve_niched(out: Place<NichedOption<T, N1>>)

Writes data to out indicating that a T is niched.
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impl<T> Pointable for T

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const ALIGN: usize

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Pointee for T

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type Metadata = ()

The metadata type for pointers and references to this type.
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impl<T, U> ToSample<U> for T
where U: FromSample<T>,

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fn to_sample_(self) -> U

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<S, T> Duplex<S> for T
where T: FromSample<S> + ToSample<S>,

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impl<T> Ungil for T
where T: Send,