Struct extendr_api::prelude::dyn_stack::StackReq

pub struct StackReq {
    align: NonZero<usize>,
    size: usize,
}

Stack allocation requirements.

Fields

align: NonZero<usize>

size: usize

Implementations

impl StackReq

pub const fn empty() -> StackReq

Allocation requirements for an empty unaligned buffer.

pub const fn new_aligned<T>(n: usize, align: usize) -> StackReq

Allocation requirements sufficient for n elements of type T, overaligned with alignment align.

Panics

• if align is smaller than the minimum required alignment for an object of type T.
• if align is not a power of two.
• if the size computation overflows

pub const fn new<T>(n: usize) -> StackReq

Allocation requirements sufficient for n elements of type T.

Panics

• if the size computation overflows

pub const fn try_new_aligned<T>( n: usize, align: usize, ) -> Result<StackReq, SizeOverflow>

Same as StackReq::new_aligned, but returns an error in case the size computation overflows.

Panics

• if align is smaller than the minimum required alignment for an object of type T.
• if align is not a power of two.

pub const fn try_new<T>(n: usize) -> Result<StackReq, SizeOverflow>

Same as StackReq::new, but returns an error in case the size computation overflows.

pub const fn size_bytes(&self) -> usize

The number of allocated bytes required, aligned to self.align_bytes().

pub const fn align_bytes(&self) -> usize

The alignment of allocated bytes required.

pub const fn unaligned_bytes_required(&self) -> usize

The number of allocated bytes required, with no alignment constraints.

Panics

• if the size computation overflows

pub const fn try_unaligned_bytes_required(&self) -> Result<usize, SizeOverflow>

Same as StackReq::unaligned_bytes_required, but returns an error if the size computation overflows.

pub const fn and(self, other: StackReq) -> StackReq

The required allocation to allocate storage sufficient for both of self and other, simultaneously and in any order.

Panics

• if the allocation requirement computation overflows.

pub fn all_of(reqs: impl IntoIterator<Item = StackReq>) -> StackReq

The required allocation to allocate storage sufficient for all the requirements produced by the given iterator, simultaneously and in any order.

Panics

• if the allocation requirement computation overflows.

pub const fn or(self, other: StackReq) -> StackReq

The required allocation to allocate storage sufficient for either of self and other, with only one being active at a time.

Panics

• if the allocation requirement computation overflows.

pub fn any_of(reqs: impl IntoIterator<Item = StackReq>) -> StackReq

The required allocation to allocate storage sufficient for any of the requirements produced by the given iterator, with at most one being active at a time.

Panics

• if the allocation requirement computation overflows.

pub const fn try_and(self, other: StackReq) -> Result<StackReq, SizeOverflow>

Same as StackReq::and, but returns an error if the size computation overflows.

pub fn try_all_of( reqs: impl IntoIterator<Item = StackReq>, ) -> Result<StackReq, SizeOverflow>

Same as StackReq::all_of, but returns an error if the size computation overflows.

pub const fn try_or(self, other: StackReq) -> Result<StackReq, SizeOverflow>

Same as StackReq::or, but returns an error if the size computation overflows.

pub fn try_any_of( reqs: impl IntoIterator<Item = StackReq>, ) -> Result<StackReq, SizeOverflow>

Same as StackReq::any_of, but returns an error if the size computation overflows.

Trait Implementations

impl Clone for StackReq

fn clone(&self) -> StackReq

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for StackReq

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

Formats the value using the given formatter.

impl Default for StackReq

fn default() -> StackReq

Returns the “default value” for a type.

impl PartialEq for StackReq

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for StackReq

impl Eq for StackReq

impl StructuralPartialEq for StackReq