Enum RoundingMode 

#[repr(u8)]
pub enum RoundingMode {
    No = 0,
    Up = 1,
    Down = 2,
    Ceiling = 3,
    Floor = 4,
    HalfUp = 5,
    HalfDown = 6,
    HalfEven = 7,
}

Determines how to calculate the last digit of the number

Default rounding mode is HalfUp.

Variants

No = 0

Special no-rounding mode.

Up = 1

Always round away from zero

• 5.5 → 6.0
• 2.5 → 3.0
• 1.6 → 2.0
• 1.1 → 2.0
• -1.1 → -2.0
• -1.6 → -2.0
• -2.5 → -3.0
• -5.5 → -6.0

Down = 2

Always round towards zero

• 5.5 → 5.0
• 2.5 → 2.0
• 1.6 → 1.0
• 1.1 → 1.0
• -1.1 → -1.0
• -1.6 → -1.0
• -2.5 → -2.0
• -5.5 → -5.0

Ceiling = 3

Towards +∞

• 5.5 → 6.0
• 2.5 → 3.0
• 1.6 → 2.0
• 1.1 → 2.0
• -1.1 → -1.0
• -1.6 → -1.0
• -2.5 → -2.0
• -5.5 → -5.0

Floor = 4

Towards -∞

• 5.5 → 5.0
• 2.5 → 2.0
• 1.6 → 1.0
• 1.1 → 1.0
• -1.1 → -2.0
• -1.6 → -2.0
• -2.5 → -3.0
• -5.5 → -6.0

HalfUp = 5

Round to ‘nearest neighbor’, or up if ending decimal is 5

• 5.5 → 6.0
• 2.5 → 3.0
• 1.6 → 2.0
• 1.1 → 1.0
• -1.1 → -1.0
• -1.6 → -2.0
• -2.5 → -3.0
• -5.5 → -6.0

HalfDown = 6

Round to ‘nearest neighbor’, or down if ending decimal is 5

• 5.5 → 5.0
• 2.5 → 2.0
• 1.6 → 2.0
• 1.1 → 1.0
• -1.1 → -1.0
• -1.6 → -2.0
• -2.5 → -2.0
• -5.5 → -5.0

HalfEven = 7

Round to ‘nearest neighbor’, if equidistant, round towards nearest even digit

• 5.5 → 6.0
• 2.5 → 2.0
• 1.6 → 2.0
• 1.1 → 1.0
• -1.1 → -1.0
• -1.6 → -2.0
• -2.5 → -2.0
• -5.5 → -6.0

Implementations

impl RoundingMode

pub const fn default() -> Self

Returns default rounding mode.

pub const fn is_default(&self) -> bool

Returns true if given RoundingMode is default.

Trait Implementations

impl Clone for RoundingMode

fn clone(&self) -> RoundingMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RoundingMode

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

Formats the value using the given formatter.

impl Default for RoundingMode

fn default() -> Self

Returns the “default value” for a type.

impl Display for RoundingMode

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

Formats the value using the given formatter.

impl Hash for RoundingMode

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 PartialEq for RoundingMode

fn eq(&self, other: &RoundingMode) -> 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 Copy for RoundingMode

impl Eq for RoundingMode

impl StructuralPartialEq for RoundingMode