Struct OptionVarULE 

#[repr(C, packed(1))]
pub struct OptionVarULE<U: VarULE + ?Sized>(/* private fields */);

A type allowing one to represent Option<U> for VarULE U types.

use zerovec::ule::OptionVarULE;
use zerovec::VarZeroVec;

let mut zv: VarZeroVec<OptionVarULE<str>> = VarZeroVec::new();

zv.make_mut().push(&None::<&str>);
zv.make_mut().push(&Some("hello"));
zv.make_mut().push(&Some("world"));
zv.make_mut().push(&None::<&str>);

assert_eq!(zv.get(0).unwrap().as_ref(), None);
assert_eq!(zv.get(1).unwrap().as_ref(), Some("hello"));

Implementations

impl<U: VarULE + ?Sized> OptionVarULE<U>

pub fn as_ref(&self) -> Option<&U>

Obtain this as an Option<&U>

Trait Implementations

impl<U: VarULE + ?Sized + Debug> Debug for OptionVarULE<U>

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

Formats the value using the given formatter.

impl<T, U> EncodeAsVarULE<OptionVarULE<U>> for Option<T>

where T: EncodeAsVarULE<U>, U: VarULE + ?Sized,

fn encode_var_ule_as_slices<R>(&self, _: impl FnOnce(&[&[u8]]) -> R) -> R

Calls cb with a piecewise list of byte slices that when concatenated produce the memory pattern of the corresponding instance of T.

fn encode_var_ule_len(&self) -> usize

Return the length, in bytes, of the corresponding VarULE type

fn encode_var_ule_write(&self, dst: &mut [u8])

Write the corresponding VarULE type to the dst buffer. dst should be the size of Self::encode_var_ule_len()

impl<U: VarULE + ?Sized + Ord> Ord for OptionVarULE<U>

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

This method returns an Ordering between self and other.

impl<U: VarULE + ?Sized + PartialEq> PartialEq for OptionVarULE<U>

fn eq(&self, other: &Self) -> 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<U: VarULE + ?Sized + PartialOrd> PartialOrd for OptionVarULE<U>

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

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<U: VarULE + ?Sized> VarULE for OptionVarULE<U>

fn validate_bytes(slice: &[u8]) -> Result<(), UleError>

Validates a byte slice, &[u8].

unsafe fn from_bytes_unchecked(bytes: &[u8]) -> &Self

Takes a byte slice, &[u8], and return it as &Self with the same lifetime, assuming that this byte slice has previously been run through Self::parse_bytes() with success.

fn parse_bytes(bytes: &[u8]) -> Result<&Self, UleError>

Parses a byte slice, &[u8], and return it as &Self with the same lifetime.

fn as_bytes(&self) -> &[u8]

Given &Self, returns a &[u8] with the same lifetime.

fn to_boxed(&self) -> Box<Self>

Allocate on the heap as a Box<T>

impl<'a, T> ZeroMapKV<'a> for OptionVarULE<T>

where T: VarULE + ?Sized,

type Container = VarZeroVec<'a, OptionVarULE<T>>

The container that can be used with this type: ZeroVec or VarZeroVec.

type Slice = VarZeroSlice<OptionVarULE<T>>

type GetType = OptionVarULE<T>

The type produced by Container::get()

type OwnedType = Box<OptionVarULE<T>>

The type produced by Container::replace() and Container::remove(), also used during deserialization. If Self is human readable serialized, deserializing to Self::OwnedType should produce the same value once passed through Self::owned_as_self()

impl<U: VarULE + ?Sized + Eq> Eq for OptionVarULE<U>

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: (unsized)