Enum TimeZoneAbbreviation

pub(crate) enum TimeZoneAbbreviation<'t> {
    Borrowed(&'t str),
    Owned(ArrayStr<9>),
}

A light abstraction over different representations of a time zone abbreviation.

The lifetime parameter 't corresponds to the lifetime of the time zone that produced this abbreviation.

Variants

Borrowed(&'t str)

For when the abbreviation is borrowed directly from other data. For example, from TZif or from POSIX TZ strings.

Owned(ArrayStr<9>)

For when the abbreviation has to be derived from other data. For example, from a fixed offset.

The idea here is that a TimeZone shouldn’t need to store the string representation of a fixed offset. Particularly in core-only environments, this is quite wasteful. So we make the string on-demand only when it’s requested.

An alternative design is to just implement Display and reuse Offset’s Display impl, but then we couldn’t offer a -> &str API. I feel like that’s just a bit overkill, and really just comes from the core-only straight-jacket.

Implementations

impl<'t> TimeZoneAbbreviation<'t>

fn as_str<'a>(&'a self) -> &'a str

Returns this abbreviation as a string borrowed from self.

Notice that, like Cow, the lifetime of the string returned is tied to self and thus may be shorter than 't.

Trait Implementations

impl<'t> Clone for TimeZoneAbbreviation<'t>

fn clone(&self) -> TimeZoneAbbreviation<'t>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'t> Debug for TimeZoneAbbreviation<'t>

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

Formats the value using the given formatter.

impl<'t> Hash for TimeZoneAbbreviation<'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 for TimeZoneAbbreviation<'t>

fn cmp(&self, other: &TimeZoneAbbreviation<'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 for TimeZoneAbbreviation<'t>

fn eq(&self, other: &TimeZoneAbbreviation<'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 for TimeZoneAbbreviation<'t>

fn partial_cmp(&self, other: &TimeZoneAbbreviation<'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> Eq for TimeZoneAbbreviation<'t>

impl<'t> StructuralPartialEq for TimeZoneAbbreviation<'t>