Struct std::ptr::Alignment

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#[repr(transparent)]
pub struct Alignment(_);
🔬This is a nightly-only experimental API. (ptr_alignment_type #102070)
Expand description

A type storing a usize which is a power of two, and thus represents a possible alignment in the rust abstract machine.

Note that particularly large alignments, while representable in this type, are likely not to be supported by actual allocators and linkers.

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impl Alignment

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pub const MIN: Alignment = _

🔬This is a nightly-only experimental API. (ptr_alignment_type #102070)

The smallest possible alignment, 1.

All addresses are always aligned at least this much.

Examples
#![feature(ptr_alignment_type)]
use std::ptr::Alignment;

assert_eq!(Alignment::MIN.as_usize(), 1);
Run
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pub const fn of<T>() -> Alignment

🔬This is a nightly-only experimental API. (ptr_alignment_type #102070)

Returns the alignment for a type.

This provides the same numerical value as mem::align_of, but in an Alignment instead of a usize.

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pub const fn new(align: usize) -> Option<Alignment>

🔬This is a nightly-only experimental API. (ptr_alignment_type #102070)

Creates an Alignment from a usize, or returns None if it’s not a power of two.

Note that 0 is not a power of two, nor a valid alignment.

const: unstable · source

pub unsafe fn new_unchecked(align: usize) -> Alignment

🔬This is a nightly-only experimental API. (ptr_alignment_type #102070)

Creates an Alignment from a power-of-two usize.

Safety

align must be a power of two.

Equivalently, it must be 1 << exp for some exp in 0..usize::BITS. It must not be zero.

const: unstable · source

pub fn as_usize(self) -> usize

🔬This is a nightly-only experimental API. (ptr_alignment_type #102070)

Returns the alignment as a usize

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pub const fn as_nonzero(self) -> NonZeroUsize

🔬This is a nightly-only experimental API. (ptr_alignment_type #102070)

Returns the alignment as a NonZeroUsize

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pub fn log2(self) -> u32

🔬This is a nightly-only experimental API. (ptr_alignment_type #102070)

Returns the base-2 logarithm of the alignment.

This is always exact, as self represents a power of two.

Examples
#![feature(ptr_alignment_type)]
use std::ptr::Alignment;

assert_eq!(Alignment::of::<u8>().log2(), 0);
assert_eq!(Alignment::new(1024).unwrap().log2(), 10);
Run

Trait Implementations§

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impl Clone for Alignment

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fn clone(&self) -> Alignment

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Alignment

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl From<Alignment> for NonZeroUsize

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fn from(align: Alignment) -> NonZeroUsize

Converts to this type from the input type.
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impl From<Alignment> for usize

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fn from(align: Alignment) -> usize

Converts to this type from the input type.
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impl Hash for Alignment

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fn hash<H>(&self, state: &mut H)where H: Hasher,

Feeds this value into the given Hasher. Read more
1.3.0 · source§

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
const: unstable · source§

impl Ord for Alignment

const: unstable · source§

fn cmp(&self, other: &Alignment) -> Ordering

This method returns an Ordering between self and other. Read more
1.21.0 · source§

fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values. Read more
1.21.0 · source§

fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values. Read more
1.50.0 · source§

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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impl PartialEq<Alignment> for Alignment

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fn eq(&self, other: &Alignment) -> bool

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
const: unstable · source§

impl PartialOrd<Alignment> for Alignment

const: unstable · source§

fn partial_cmp(&self, other: &Alignment) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
1.0.0 · source§

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
1.0.0 · source§

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
1.0.0 · source§

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
1.0.0 · source§

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl TryFrom<NonZeroUsize> for Alignment

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type Error = TryFromIntError

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

Performs the conversion.
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impl TryFrom<usize> for Alignment

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type Error = TryFromIntError

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

Performs the conversion.
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impl Copy for Alignment

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impl Eq for Alignment

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impl StructuralEq for Alignment

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impl StructuralPartialEq for Alignment

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere 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> Borrow<T> for Twhere 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 Twhere 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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere 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 Twhere 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.