Struct chrono::naive::internals::Mdf

pub(super) struct Mdf(u32);

Month, day of month and year flags: (month << 9) | (day << 4) | flags M_MMMD_DDDD_LFFF

The whole bits except for the least 3 bits are referred as Mdl (month, day of month, and leap year flag), which is an index to the MDL_TO_OL lookup table.

The conversion between the packed calendar date (Mdf) and the ordinal date (NaiveDate) is based on the moderately-sized lookup table (~1.5KB) and the packed representation is chosen for efficient lookup.

The methods of Mdf validate their inputs as late as possible. Dates that can’t exist, like February 30, can still be represented. This allows the validation to be combined with the final table lookup, which is good for performance.

Tuple Fields

0: u32

Implementations

impl Mdf

pub(super) const fn new( month: u32, day: u32, YearFlags: YearFlags ) -> Option<Mdf>

Makes a new Mdf value from month, day and YearFlags.

This method doesn’t fully validate the range of the month and day parameters, only as much as what can’t be deferred until later. The year flags are trusted to be correct.

Errors

Returns None if month > 12 or day > 31.

pub(super) const fn from_ol(ol: i32, YearFlags: YearFlags) -> Mdf

Makes a new Mdf value from an i32 with an ordinal and a leap year flag, and year flags.

The ol is trusted to be valid, and the flags are trusted to match it.

pub(super) const fn month(&self) -> u32

Returns the month of this Mdf.

pub(super) const fn with_month(&self, month: u32) -> Option<Mdf>

Replaces the month of this Mdf, keeping the day and flags.

Errors

Returns None if month > 12.

pub(super) const fn day(&self) -> u32

Returns the day of this Mdf.

pub(super) const fn with_day(&self, day: u32) -> Option<Mdf>

Replaces the day of this Mdf, keeping the month and flags.

Errors

Returns None if day > 31.

pub(super) const fn with_flags(&self, YearFlags: YearFlags) -> Mdf

Replaces the flags of this Mdf, keeping the month and day.

pub(super) const fn ordinal(&self) -> Option<u32>

Returns the ordinal that corresponds to this Mdf.

This does a table lookup to calculate the corresponding ordinal. It will return an error if the Mdl turns out not to be a valid date.

Errors

Returns None if month == 0 or day == 0, or if a the given day does not exist in the given month.

pub(super) const fn year_flags(&self) -> YearFlags

Returns the year flags of this Mdf.

pub(super) const fn ordinal_and_flags(&self) -> Option<i32>

Returns the ordinal that corresponds to this Mdf, encoded as a value including year flags.

This does a table lookup to calculate the corresponding ordinal. It will return an error if the Mdl turns out not to be a valid date.

Errors

Returns None if month == 0 or day == 0, or if a the given day does not exist in the given month.

Trait Implementations

impl Clone for Mdf

fn clone(&self) -> Mdf

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Mdf

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

Formats the value using the given formatter.

impl PartialEq<Mdf> for Mdf

fn eq(&self, other: &Mdf) -> bool

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

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd<Mdf> for Mdf

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

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

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

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

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

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

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

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

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

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

impl Copy for Mdf

impl StructuralPartialEq for Mdf