Struct Opaque 

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

An opaque integer type, used to represent enum variants, usize and isize.

Supports converting to and from all integer primitive types.

Conversion errors where the value wouldn’t fit in the requested type, are coerced to EncodingErrors

Beware of providing an Opaque with an integer literal without a specific type!

By default, rust will infer i32 as the type, thus it will be converted to a Signed enum variant value, and you will get a (bad) surprise when you try to then encode/decode an enum that uses Unsigned variant discriminants (most enums).

How to avoid this?

• Write the type in the num literal E.G. Opaque::from(3u32) or Opaque::from(3 as u32)
• Better yet, use an explicit opaque value (Opaque::signed, Opaque::unsigned)

Implementations

impl Opaque

pub fn signed<V>(value: V) -> Self

where V: Sign<Sign = Signed>, Self: From<V>,

Constructs a new opaque integer, enforcing at compile time that the number type is signed

pub fn unsigned<V>(value: V) -> Self

where V: Sign<Sign = Unsigned>, Self: From<V>,

Constructs a new opaque integer, enforcing at compile time that the number type is unsigned

pub fn sign(&self) -> Signedness

Returns the Signedness of the opaque integer.

Trait Implementations

impl Clone for Opaque

fn clone(&self) -> Opaque

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Opaque

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

Formats the value using the given formatter.

impl Display for Opaque

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

Formats the value using the given formatter.

impl From<i128> for Opaque

fn from(value: i128) -> Self

Converts to this type from the input type.

impl From<i16> for Opaque

fn from(value: i16) -> Self

Converts to this type from the input type.

impl From<i32> for Opaque

fn from(value: i32) -> Self

Converts to this type from the input type.

impl From<i64> for Opaque

fn from(value: i64) -> Self

Converts to this type from the input type.

impl From<i8> for Opaque

fn from(value: i8) -> Self

Converts to this type from the input type.

impl From<isize> for Opaque

fn from(value: isize) -> Self

Converts to this type from the input type.

impl From<u128> for Opaque

fn from(value: u128) -> Self

Converts to this type from the input type.

impl From<u16> for Opaque

fn from(value: u16) -> Self

Converts to this type from the input type.

impl From<u32> for Opaque

fn from(value: u32) -> Self

Converts to this type from the input type.

impl From<u64> for Opaque

fn from(value: u64) -> Self

Converts to this type from the input type.

impl From<u8> for Opaque

fn from(value: u8) -> Self

Converts to this type from the input type.

impl From<usize> for Opaque

fn from(value: usize) -> Self

Converts to this type from the input type.

impl Hash for Opaque

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 Opaque

fn eq(&self, other: &Opaque) -> 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 TryInto<i128> for Opaque

type Error = EncodingError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<i128, Self::Error>

Performs the conversion.

impl TryInto<i16> for Opaque

type Error = EncodingError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<i16, Self::Error>

Performs the conversion.

impl TryInto<i32> for Opaque

type Error = EncodingError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<i32, Self::Error>

Performs the conversion.

impl TryInto<i64> for Opaque

type Error = EncodingError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<i64, Self::Error>

Performs the conversion.

impl TryInto<i8> for Opaque

type Error = EncodingError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<i8, Self::Error>

Performs the conversion.

impl TryInto<isize> for Opaque

type Error = EncodingError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<isize, Self::Error>

Performs the conversion.

impl TryInto<u128> for Opaque

type Error = EncodingError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<u128, Self::Error>

Performs the conversion.

impl TryInto<u16> for Opaque

type Error = EncodingError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<u16, Self::Error>

Performs the conversion.

impl TryInto<u32> for Opaque

type Error = EncodingError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<u32, Self::Error>

Performs the conversion.

impl TryInto<u64> for Opaque

type Error = EncodingError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<u64, Self::Error>

Performs the conversion.

impl TryInto<u8> for Opaque

type Error = EncodingError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<u8, Self::Error>

Performs the conversion.

impl TryInto<usize> for Opaque

type Error = EncodingError

The type returned in the event of a conversion error.

fn try_into(self) -> Result<usize, Self::Error>

Performs the conversion.

impl Copy for Opaque

impl Eq for Opaque

impl StructuralPartialEq for Opaque