Struct exonum::helpers::Height

pub struct Height(pub u64);

Blockchain's height (number of blocks).

Methods

impl Height

fn zero() -> Self

Returns zero value of the height.

Examples

use exonum::helpers::Height;

let height = Height::zero();
assert_eq!(0, height.0);

fn next(&self) -> Self

Returns next value of the height.

Examples

use exonum::helpers::Height;

let height = Height(10);
let next_height = height.next();
assert_eq!(11, next_height.0);

fn previous(&self) -> Self

Returns previous value of the height.

Panics

Panics if self.0 is equal to zero.

Examples

use exonum::helpers::Height;

let height = Height(10);
let previous_height = height.previous();
assert_eq!(9, previous_height.0);

fn increment(&mut self)

Increments the height value.

Examples

use exonum::helpers::Height;

let mut height = Height::zero();
height.increment();
assert_eq!(1, height.0);

fn decrement(&mut self)

Decrements the height value.

Panics

Panics if self.0 is equal to zero.

Examples

use exonum::helpers::Height;

let mut height = Height(20);
height.decrement();
assert_eq!(19, height.0);

Trait Implementations

impl ExonumJson for Height

fn deserialize_field<B: WriteBufferWrapper>(
    value: &Value,
    buffer: &mut B,
    from: Offset,
    to: Offset
) -> Result<(), Box<Error>>

write deserialized field in buffer on place.

fn serialize_field(&self) -> Result<Value, Box<Error + Send + Sync>>

serialize field as json::Value

impl<'a> Field<'a> for Height

fn field_size() -> Offset

Field's header size

unsafe fn read(buffer: &'a [u8], from: Offset, to: Offset) -> Height

Read Field from buffer, with given position, beware of memory unsafety, you should check Field before read.

fn write(&self, buffer: &mut Vec<u8>, from: Offset, to: Offset)

Write Field to buffer, in given position write doesn't lead to memory unsafety.

fn check(
    _: &'a [u8],
    from: CheckedOffset,
    to: CheckedOffset,
    latest_segment: CheckedOffset
) -> Result

Checks if data in the buffer could be deserialized. Returns an index of latest data seen.

impl Debug for Height

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Copy for Height

impl Clone for Height

fn clone(&self) -> Height

Returns a copy of the value.

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

Performs copy-assignment from source.

impl PartialEq for Height

fn eq(&self, __arg_0: &Height) -> bool

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

fn ne(&self, __arg_0: &Height) -> bool

This method tests for !=.

impl Eq for Height

impl PartialOrd for Height

fn partial_cmp(&self, __arg_0: &Height) -> Option<Ordering>

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

fn lt(&self, __arg_0: &Height) -> bool

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

fn le(&self, __arg_0: &Height) -> bool

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

fn gt(&self, __arg_0: &Height) -> bool

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

fn ge(&self, __arg_0: &Height) -> bool

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

impl Ord for Height

fn cmp(&self, __arg_0: &Height) -> 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.

impl Hash for Height

fn hash<__H: Hasher>(&self, __arg_0: &mut __H)

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 Display for Height

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

Formats the value using the given formatter.

impl Serialize for Height

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where
    S: Serializer, 

Serialize this value into the given Serde serializer.

impl<'de> Deserialize<'de> for Height

fn deserialize<D>(deserializer: D) -> Result<Height, D::Error> where
    D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.