Enum Rounding 

#[non_exhaustive]
pub enum Rounding {
    RoundDown,
    RoundUp,
    RoundTowardsZero,
    RoundAwayFromZero,
    RoundHalfDown,
    RoundHalfUp,
    RoundHalfTowardsZero,
    RoundHalfAwayFromZero,
    RoundHalfToEven,
    RoundHalfToOdd,
}

Available on non-no_re_export only.

Enum to implement different rounding methods.

Method	Result is -2	Result is -1	Result is 0	Result is 1	Result is 2	Implementor
Directed, Down	[-2.0, -1.0)	[-1.0, 0.0)	[0.0, 1.0)	[1.0, 2.0)	[2.0, 3.0)	RoundDown
Directed, Up	(-3.0, -2.0]	(-2.0, -1.0]	(-1.0, 0.0]	(0.0, 1.0]	(1.0, 2.0]	RoundUp
Directed, Towards 0	(-3.0, -2.0]	(-2.0, -1.0]	(-1.0, 1.0)	[1.0, 2.0)	[2.0, 3.0)	RoundTowardsZero
Directed, Away From 0	[-2.0, -1.0)	[-1.0, 0.0)	0.0	(0.0, 1.0]	(1.0, 2.0]	RoundAwayFromZero
Nearest, Half Down	(-2.5, -1.5]	(-1.5, -0.5]	(-0.5, 0.5]	(0.5, 1.5]	(1.5, 2.5]	RoundHalfDown
Nearest, Half Up	[-2.5, -1.5)	[-1.5, -0.5)	[-0.5, 0.5)	[0.5, 1.5)	[1.5, 2.5)	RoundHalfUp
Nearest, Half Towards 0	[-2.5, -1.5)	[-1.5, -0.5)	[-0.5, 0.5]	(0.5, 1.5]	(1.5, 2.5]	RoundHalfTowardsZero
Nearest, Half Away From 0	(-2.5, -1.5]	(-1.5, -0.5]	(-0.5, 0.5)	[0.5, 1.5)	[1.5, 2.5)	RoundHalfAwayFromZero
Nearest, Half To Even	[-2.5, -1.5]	(-1.5, -0.5)	[-0.5, 0.5]	(0.5, 1.5)	[1.5, 2.5]	RoundHalfToEven
Nearest, half To Odd	(-2.5, -1.5)	[-1.5, -0.5]	(-0.5, 0.5)	[0.5, 1.5]	(1.5, 2.5)	RoundHalfToOdd

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

RoundDown

Also known as floor.

RoundUp

Also known as ceiling.

RoundTowardsZero

Also known as truncate.

RoundAwayFromZero

Used by f64::round.

RoundHalfDown

RoundHalfUp

RoundHalfTowardsZero

RoundHalfAwayFromZero

[Default] Probably what you learned in school.

RoundHalfToEven

Often used in binary IEEE Floating-Point arithmetic.

Not for the rounding operation but by other operations, which create more digits as can be stored.

RoundHalfToOdd

Trait Implementations

impl Clone for Rounding

fn clone(&self) -> Rounding

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Rounding

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

Formats the value using the given formatter.

impl Default for Rounding

fn default() -> Rounding

Returns the “default value” for a type.

impl Copy for Rounding