Struct swim_structure::item::Absent

#[repr(C)]
pub struct Absent { /* fields omitted */ }

Value variant representing an undefined value.

Methods

impl Absent

pub const fn new() -> Absent

Constructs a new Absent value.

pub fn as_value<'a>(&self) -> &Value<'a>

Upcasts this Absent reference to a Value reference.

pub fn as_mut_value<'a>(&mut self) -> &mut Value<'a>

Upcasts this Absent reference to a mutable Value reference.

pub fn into_value<'a>(self) -> Value<'a>

Upcasts Absent to a Value.

pub fn into_item<'a>(self) -> Item<'a>

Upcasts Absent to an Item.

Trait Implementations

impl PartialEq<Absent> for Absent

fn eq(&self, _that: &Absent) -> bool

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

#[must_use]

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

This method tests for !=.

impl Eq for Absent

impl<'a> From<Absent> for Item<'a>

fn from(absent: Absent) -> Item<'a>

Performs the conversion.

impl<'a> From<Absent> for Value<'a>

fn from(absent: Absent) -> Value<'a>

Performs the conversion.

impl Debug for Absent

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Hash for Absent

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

Feeds this value into the given [Hasher].

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

Feeds a slice of this type into the given [Hasher].

impl Clone for Absent

fn clone(&self) -> Absent

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> AsMut<Value<'a>> for Absent

fn as_mut(&mut self) -> &mut Value<'a>

Performs the conversion.

impl<'a> AsRef<Value<'a>> for Absent

fn as_ref(&self) -> &Value<'a>

Performs the conversion.

impl<'b> Stow<'b, Absent> for Absent

unsafe fn stow(
    src: *mut Absent,
    dst: *mut Absent,
    _hold: &dyn Hold<'b>
) -> Result<(), HoldError>

Moves the value at the src pointer to the dst pointer, recursively moving all child values into the hold. If a child stow operation fails, then any already completed child stow operations get reverted by calling unstow on the child.

unsafe fn unstow(_src: *mut Absent, _dst: *mut Absent)

Reverts the most recent stow operation by moving the value at the dst pointer back to the src pointer from whence it came. The memory at the src address will be in the same state the stow operation left it in.

impl TryClone for Absent

fn try_clone(&self) -> Result<Absent, HoldError>

Returns a clone of self; returns an error if the clone fails.

impl<'a> CloneIntoHold<'a, Absent> for Absent

fn try_clone_into_hold(&self, _hold: &dyn Hold<'a>) -> Result<Absent, HoldError>

Returns a clone of self allocated in hold; returns an error if the clone fails.

default fn clone_into_hold(&self, hold: &dyn Hold<'a>) -> T

Returns a clone of self allocated in hold.