Struct Counter 

pub struct Counter<T: Countable>(/* private fields */);

An opaque counter that produces unique IDs of type T via Counter::get_and_increment.

This is separate from the ID types themselves so that holding an ID does not give the ability to mint new IDs.

Implementations

impl<T: Countable> Counter<T>

pub fn get_and_increment(&mut self) -> T

Gets the current counter value and increments for the next call.

pub fn range_up_to(&self) -> impl DoubleEndedIterator<Item = T> + FusedIterator

Returns an iterator from zero up to (but excluding) the current counter value.

This is useful for iterating already-allocated values.

Trait Implementations

impl<T: Clone + Countable> Clone for Counter<T>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Copy + Countable> Copy for Counter<T>

impl<T: Debug + Countable> Debug for Counter<T>

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

Formats the value using the given formatter.

impl<T: Countable> Default for Counter<T>

fn default() -> Self

Returns the “default value” for a type.

impl<T: Eq + Countable> Eq for Counter<T>

impl<T: Hash + Countable> Hash for Counter<T>

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<T: Ord + Countable> Ord for Counter<T>

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

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

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

where Self: Sized,

Restrict a value to a certain interval.

impl<T: PartialEq + Countable> PartialEq for Counter<T>

fn eq(&self, other: &Counter<T>) -> 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<T: PartialOrd + Countable> PartialOrd for Counter<T>

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl<T: PartialEq + Countable> StructuralPartialEq for Counter<T>