Struct bonsaidb::core::ordered_varint::Signed

pub struct Signed(_);

A signed integer value.

This type encodes values in the range -2.pow(123)..2.pow(123) by using the first 5 bits to denote a signed byte length. This length ranges from -15..=15. The number of bytes read is always absolute, but the sign of the length is used to determine the overall sign of the encoded value. The remaining 3 bits of the first byte and any additional bytes are then used to store the integer in big-endian encoding.

Trait Implementations

impl Clone for Signed

fn clone(&self) -> Signed

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Signed

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

Formats the value using the given formatter.

impl From<i128> for Signed

fn from(value: i128) -> Signed

Converts to this type from the input type.

impl From<i16> for Signed

fn from(value: i16) -> Signed

Converts to this type from the input type.

impl From<i32> for Signed

fn from(value: i32) -> Signed

Converts to this type from the input type.

impl From<i64> for Signed

fn from(value: i64) -> Signed

Converts to this type from the input type.

impl From<i8> for Signed

fn from(value: i8) -> Signed

Converts to this type from the input type.

impl From<isize> for Signed

fn from(value: isize) -> Signed

Converts to this type from the input type.

impl Hash for Signed

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

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<'k> Key<'k> for Signed

const CAN_OWN_BYTES: bool = false

If true, this type can benefit from an owned Vec<u8>. This flag is used as a hint of whether to attempt to do memcpy operations in some decoding operations to avoid extra allocations.

fn from_ord_bytes<'e>( bytes: ByteSource<'k, 'e> ) -> Result<Signed, <Signed as KeyEncoding<Signed>>::Error>

Deserialize a sequence of bytes previously encoded with KeyEncoding::as_ord_bytes.

fn first_value() -> Result<Signed, NextValueError>

Return the first value in sequence for this type. Not all types implement this.

fn next_value(&self) -> Result<Signed, NextValueError>

Return the next value in sequence for this type. Not all types implement this. Instead of wrapping/overflowing, None should be returned.

impl KeyEncoding<Signed> for Signed

type Error = Error

The error type that can be produced by either serialization or deserialization.

const LENGTH: Option<usize> = None

The size of the key, if constant. If this type doesn’t produce the same number of bytes for each value, this should be None.

fn describe<Visitor>(visitor: &mut Visitor)where Visitor: KeyVisitor,

Describes this type by invoking functions on visitor describing the key being encoded.

fn as_ord_bytes( &self ) -> Result<Cow<'_, [u8]>, <Signed as KeyEncoding<Signed>>::Error>

Convert self into a Cow<'_, [u8]> containing bytes that are able to be compared via memcmp in a way that is comptaible with its own Ord implementation.

impl Ord for Signed

fn cmp(&self, other: &Signed) -> 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<Signed> for Signed

fn eq(&self, other: &Signed) -> 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<Signed> for Signed

fn partial_cmp(&self, other: &Signed) -> 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 Variable for Signed

fn encode_variable<W>(&self, output: W) -> Result<usize, Error>where W: Write,

Encodes self into destination, returning the number of bytes written upon success.

fn decode_variable<R>(input: R) -> Result<Signed, Error>where R: Read,

Decodes a variable length value from source.

fn to_variable_vec(&self) -> Result<Vec<u8, Global>, Error>

Encodes self into a new Vec<u8>.

impl Copy for Signed

impl Eq for Signed

impl StructuralEq for Signed

impl StructuralPartialEq for Signed