Struct OptionalVarInt 

pub struct OptionalVarInt(/* private fields */);

An optional VarInt encoded as zero for absence and value + 1 for presence.

The in-memory value is the actual value, not the incremented wire selector. -1 collides with the absent selector and i32::MAX cannot be incremented, so constructors reject those two present values.

Implementations

impl OptionalVarInt

pub const fn none() -> Self

Creates an absent value.

pub const fn some(value: i32) -> Result<Self, InvalidOptionalVarIntValue>

Creates a present value when value + 1 has an unambiguous VarInt form.

pub const fn value(self) -> Option<i32>

Returns the actual present value, before wire incrementing.

pub const fn is_some(self) -> bool

Returns whether the value is present.

pub const fn is_none(self) -> bool

Returns whether the value is absent.

Trait Implementations

impl Clone for OptionalVarInt

fn clone(&self) -> OptionalVarInt

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for OptionalVarInt

impl Debug for OptionalVarInt

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

Formats the value using the given formatter.

impl Default for OptionalVarInt

fn default() -> OptionalVarInt

Returns the “default value” for a type.

impl Eq for OptionalVarInt

impl Hash for OptionalVarInt

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 PartialEq for OptionalVarInt

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for OptionalVarInt

impl TryFrom<Option<i32>> for OptionalVarInt

type Error = InvalidOptionalVarIntValue

The type returned in the event of a conversion error.

fn try_from(value: Option<i32>) -> Result<Self, Self::Error>

Performs the conversion.

impl TypeCodec for OptionalVarInt

fn encode(&self, writer: &mut impl Write) -> Result<(), CodecError>

Encodes this value to the writer.

fn decode(reader: &mut impl Read) -> Result<Self, CodecError>

Decodes this value from the reader.