Struct mmtkvdb::storable::NoValue

pub struct NoValue;

Unit type denoting no value (for databases which only contain keys but no values)

Trait Implementations

impl Clone for NoValue

fn clone(&self) -> NoValue

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for NoValue

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

Formats the value using the given formatter.

impl Default for NoValue

fn default() -> NoValue

Returns the “default value” for a type.

impl Hash for NoValue

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl Ord for NoValue

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

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

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

Restrict a value to a certain interval.

impl PartialEq<NoValue> for NoValue

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

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

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.

impl PartialOrd<NoValue> for NoValue

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

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

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl Storable for NoValue

const CONST_BYTES_LEN: bool = true

Does byte representation have fixed length?

const TRIVIAL_CMP: bool = true

Does Storable::cmp_bytes_unchecked perform a trivial (byte wise) lexicographical comparison?

type BytesRef<'a> = &'static [u8]

Byte representation as GenericCow

fn to_bytes(&self) -> Self::BytesRef<'_>

Converts to byte slice

fn bytes_len(&self) -> usize

Length of byte representation

type AlignedRef<'a> = &'static NoValue

Aligned version of Self as GenericCow

unsafe fn from_bytes_unchecked(_bytes: &[u8]) -> Self::AlignedRef<'_>

Converts from byte slice

unsafe fn cmp_bytes_unchecked(_a: &[u8], _b: &[u8]) -> Ordering

Compares byte representation

const OPTIMIZE_INT: bool = false

Is type equivalent to c_uint or the C type size_t, and is its byte representation in native byte order?

unsafe fn cmp_bytes_by_ord_unchecked(a: &[u8], b: &[u8]) -> Orderingwhere Self: Ord,

Compares byte representation using Ord

impl StorableConstBytesLen for NoValue

const BYTES_LEN: usize = 0usize

Length of byte representation as constant

impl Copy for NoValue

impl Eq for NoValue

impl StructuralEq for NoValue

impl StructuralPartialEq for NoValue