Struct varuint::Varint

pub struct Varint<T: VarintBaseType>(pub T);

Variable length signed integer.

Examples

use std::mem;

use varuint::{Varint, Serializable, Deserializable};

fn test_varint(v: i128, size: usize) {
    println!("{}", v);
    let v = Varint(v);
    assert_eq!(size, v.size_hint());
    let mut arr: [u8; 17] = unsafe { mem::uninitialized() };
    assert_eq!(size, v.serialize(&mut (&mut arr as &mut [u8])).unwrap());
    assert_eq!(v, Varint::deserialize(&mut (&arr as &[u8])).unwrap());
}

test_varint(0, 1);
test_varint(1, 1);
test_varint(-1, 1);

test_varint(-120, 1);
test_varint(120, 1);

test_varint(-2031/2, 2);
test_varint(2031/2, 2);

test_varint(-67567/2, 3);
test_varint(67567/2, 3);

test_varint(-16777215/2, 4);
test_varint(16777215/2, 4);

test_varint(-4294967295/2, 5);
test_varint(4294967295/2, 5);

test_varint(-1099511627775/2, 6);
test_varint(1099511627775/2, 6);

test_varint(-281474976710655/2, 7);
test_varint(281474976710655/2, 7);

test_varint(-72057594037927935/2, 8);
test_varint(72057594037927935/2, 8);

test_varint(i64::min_value().into(), 9);
test_varint(i64::max_value().into(), 9);

test_varint(i128::min_value(), 17);
test_varint(i128::max_value(), 17);

Trait Implementations

impl Serializable for Varint<u8>

fn size_hint(&self) -> usize

Get a hint of encoded value byte-length

fn serialize(&self, w: &mut dyn Write) -> Result<usize>

Serialize a value, returns bytes written

impl Serializable for Varint<u16>

fn size_hint(&self) -> usize

Get a hint of encoded value byte-length

fn serialize(&self, w: &mut dyn Write) -> Result<usize>

Serialize a value, returns bytes written

impl Serializable for Varint<u32>

fn size_hint(&self) -> usize

Get a hint of encoded value byte-length

fn serialize(&self, w: &mut dyn Write) -> Result<usize>

Serialize a value, returns bytes written

impl Serializable for Varint<u64>

fn size_hint(&self) -> usize

Get a hint of encoded value byte-length

fn serialize(&self, w: &mut dyn Write) -> Result<usize>

Serialize a value, returns bytes written

impl Serializable for Varint<u128>

fn size_hint(&self) -> usize

Get a hint of encoded value byte-length

fn serialize(&self, w: &mut dyn Write) -> Result<usize>

Serialize a value, returns bytes written

impl Serializable for Varint<i8>

fn size_hint(&self) -> usize

Get a hint of encoded value byte-length

fn serialize(&self, w: &mut dyn Write) -> Result<usize>

Serialize a value, returns bytes written

impl Serializable for Varint<i16>

fn size_hint(&self) -> usize

Get a hint of encoded value byte-length

fn serialize(&self, w: &mut dyn Write) -> Result<usize>

Serialize a value, returns bytes written

impl Serializable for Varint<i32>

fn size_hint(&self) -> usize

Get a hint of encoded value byte-length

fn serialize(&self, w: &mut dyn Write) -> Result<usize>

Serialize a value, returns bytes written

impl Serializable for Varint<i64>

fn size_hint(&self) -> usize

Get a hint of encoded value byte-length

fn serialize(&self, w: &mut dyn Write) -> Result<usize>

Serialize a value, returns bytes written

impl Serializable for Varint<i128>

fn size_hint(&self) -> usize

Get a hint of encoded value byte-length

fn serialize(&self, w: &mut dyn Write) -> Result<usize>

Serialize a value, returns bytes written

impl Deserializable for Varint<u8>

fn deserialize(r: &mut dyn Read) -> Result<Self>

Deserialize value from a Read

impl Deserializable for Varint<u16>

fn deserialize(r: &mut dyn Read) -> Result<Self>

Deserialize value from a Read

impl Deserializable for Varint<u32>

fn deserialize(r: &mut dyn Read) -> Result<Self>

Deserialize value from a Read

impl Deserializable for Varint<u64>

fn deserialize(r: &mut dyn Read) -> Result<Self>

Deserialize value from a Read

impl Deserializable for Varint<u128>

fn deserialize(r: &mut dyn Read) -> Result<Self>

Deserialize value from a Read

impl Deserializable for Varint<i8>

fn deserialize(r: &mut dyn Read) -> Result<Self>

Deserialize value from a Read

impl Deserializable for Varint<i16>

fn deserialize(r: &mut dyn Read) -> Result<Self>

Deserialize value from a Read

impl Deserializable for Varint<i32>

fn deserialize(r: &mut dyn Read) -> Result<Self>

Deserialize value from a Read

impl Deserializable for Varint<i64>

fn deserialize(r: &mut dyn Read) -> Result<Self>

Deserialize value from a Read

impl Deserializable for Varint<i128>

fn deserialize(r: &mut dyn Read) -> Result<Self>

Deserialize value from a Read

impl<T: Clone + VarintBaseType> Clone for Varint<T>

fn clone(&self) -> Varint<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: PartialEq + VarintBaseType> PartialEq<Varint<T>> for Varint<T>

fn eq(&self, other: &Varint<T>) -> bool

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

fn ne(&self, other: &Varint<T>) -> bool

This method tests for !=.

impl<T: PartialOrd + VarintBaseType> PartialOrd<Varint<T>> for Varint<T>

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

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

fn lt(&self, other: &Varint<T>) -> bool

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

fn le(&self, other: &Varint<T>) -> bool

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

fn gt(&self, other: &Varint<T>) -> bool

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

fn ge(&self, other: &Varint<T>) -> bool

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

impl<T: Ord + VarintBaseType> Ord for Varint<T>

fn cmp(&self, other: &Varint<T>) -> Ordering

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

🔬 This is a nightly-only experimental API. (clamp)

Returns max if self is greater than max, and min if self is less than min. Otherwise this will return self. Panics if min > max.

impl<T: Eq + VarintBaseType> Eq for Varint<T>

impl<T: Copy + VarintBaseType> Copy for Varint<T>

impl From<i8> for Varint<i8>

fn from(i: i8) -> Self

Performs the conversion.

impl From<i8> for Varint<i16>

fn from(i: i8) -> Self

Performs the conversion.

impl From<i8> for Varint<i32>

fn from(i: i8) -> Self

Performs the conversion.

impl From<i8> for Varint<i64>

fn from(i: i8) -> Self

Performs the conversion.

impl From<i8> for Varint<i128>

fn from(i: i8) -> Self

Performs the conversion.

impl From<i16> for Varint<i16>

fn from(i: i16) -> Self

Performs the conversion.

impl From<i16> for Varint<i32>

fn from(i: i16) -> Self

Performs the conversion.

impl From<i16> for Varint<i64>

fn from(i: i16) -> Self

Performs the conversion.

impl From<i16> for Varint<i128>

fn from(i: i16) -> Self

Performs the conversion.

impl From<i32> for Varint<i32>

fn from(i: i32) -> Self

Performs the conversion.

impl From<i32> for Varint<i64>

fn from(i: i32) -> Self

Performs the conversion.

impl From<i32> for Varint<i128>

fn from(i: i32) -> Self

Performs the conversion.

impl From<i64> for Varint<i64>

fn from(i: i64) -> Self

Performs the conversion.

impl From<i64> for Varint<i128>

fn from(i: i64) -> Self

Performs the conversion.

impl From<i128> for Varint<i128>

fn from(v: i128) -> Self

Performs the conversion.

impl From<u8> for Varint<u128>

fn from(v: u8) -> Self

Performs the conversion.

impl From<u16> for Varint<u128>

fn from(v: u16) -> Self

Performs the conversion.

impl From<u32> for Varint<u128>

fn from(v: u32) -> Self

Performs the conversion.

impl From<u64> for Varint<u128>

fn from(v: u64) -> Self

Performs the conversion.

impl From<u128> for Varint<u128>

fn from(v: u128) -> Self

Performs the conversion.

impl Default for Varint<u128>

fn default() -> Self

Returns the "default value" for a type.

impl Default for Varint<i8>

fn default() -> Self

Returns the "default value" for a type.

impl Default for Varint<i16>

fn default() -> Self

Returns the "default value" for a type.

impl Default for Varint<i32>

fn default() -> Self

Returns the "default value" for a type.

impl Default for Varint<i64>

fn default() -> Self

Returns the "default value" for a type.

impl Default for Varint<i128>

fn default() -> Self

Returns the "default value" for a type.

impl<T: VarintBaseType> Deref for Varint<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<T: VarintBaseType> DerefMut for Varint<T>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<T: Hash + VarintBaseType> Hash for Varint<T>

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

Feeds this value into the given [Hasher].

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

Feeds a slice of this type into the given [Hasher].

impl<T: Debug + VarintBaseType> Debug for Varint<T>

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

Formats the value using the given formatter.

impl<T: VarintBaseType + Display> Display for Varint<T>

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

Formats the value using the given formatter.