# Struct sp_runtime::Rational128

``pub struct Rational128(_, _);``
Expand description

Re-export top-level arithmetic stuff. A wrapper for any rational number with a 128 bit numerator and denominator.

## Implementations§

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### impl Rational128

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Zero.

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One

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#### pub fn is_zero(&self) -> bool

If it is zero or not

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#### pub fn from(n: u128, d: u128) -> Rational128

Build from a raw `n/d`.

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#### pub fn from_unchecked(n: u128, d: u128) -> Rational128

Build from a raw `n/d`. This could lead to / 0 if not properly handled.

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#### pub fn n(&self) -> u128

Return the numerator.

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#### pub fn d(&self) -> u128

Return the denominator.

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#### pub fn to_den(self, den: u128) -> Option<Rational128>

Convert `self` to a similar rational number where denominator is the given `den`. This only returns if the result is accurate. `None` is returned if the result cannot be accurately calculated.

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#### pub fn lcm(&self, other: &Rational128) -> Option<u128>

Get the least common divisor of `self` and `other`.

This only returns if the result is accurate. `None` is returned if the result cannot be accurately calculated.

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#### pub fn lazy_saturating_add(self, other: Rational128) -> Rational128

A saturating add that assumes `self` and `other` have the same denominator.

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#### pub fn lazy_saturating_sub(self, other: Rational128) -> Rational128

A saturating subtraction that assumes `self` and `other` have the same denominator.

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#### pub fn checked_add( self, other: Rational128 ) -> Result<Rational128, &'static str>

Overflow might happen during any of the steps. Error is returned in such cases.

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#### pub fn checked_sub( self, other: Rational128 ) -> Result<Rational128, &'static str>

Subtraction. Simply tries to unify the denominators and subtract the numerators.

Overflow might happen during any of the steps. None is returned in such cases.

## Trait Implementations§

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### impl Bounded for Rational128

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#### fn min_value() -> Rational128

Returns the smallest finite number this type can represent
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#### fn max_value() -> Rational128

Returns the largest finite number this type can represent
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### impl Clone for Rational128

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#### fn clone(&self) -> Rational128

Returns a copy of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl Debug for Rational128

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

Formats the value using the given formatter. Read more
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### impl Default for Rational128

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#### fn default() -> Rational128

Returns the “default value” for a type. Read more
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### impl<T> From<T> for Rational128where T: Into<u128>,

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#### fn from(t: T) -> Rational128

Converts to this type from the input type.
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### impl Ord for Rational128

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#### fn cmp(&self, other: &Rational128) -> Ordering

This method returns an `Ordering` between `self` and `other`. Read more
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#### fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values. Read more
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#### fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values. Read more
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#### fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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### impl PartialEq<Rational128> for Rational128

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#### fn eq(&self, other: &Rational128) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### 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.
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### impl PartialOrd<Rational128> for Rational128

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#### fn partial_cmp(&self, other: &Rational128) -> Option<Ordering>

This method returns an ordering between `self` and `other` values if one exists. Read more
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#### fn lt(&self, other: &Rhs) -> bool

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more
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#### fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more
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#### fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more
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#### fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more
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## Blanket Implementations§

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### impl<T> Any for Twhere T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for Twhere T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for Twhere T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> CheckedConversion for T

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#### fn checked_from<T>(t: T) -> Option<Self>where Self: TryFrom<T>,

Convert from a value of `T` into an equivalent instance of `Option<Self>`. Read more
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#### fn checked_into<T>(self) -> Option<T>where Self: TryInto<T>,

Consume self to return `Some` equivalent value of `Option<T>`. Read more
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### impl<T> Clear for Twhere T: Default + Eq + PartialEq<T>,

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#### fn is_clear(&self) -> bool

True iff no bits are set.
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#### fn clear() -> T

Return the value of Self that is clear.
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### impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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#### fn equivalent(&self, key: &K) -> bool

Compare self to `key` and return `true` if they are equal.
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### impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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#### fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T> Instrument for T

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#### fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
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#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
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### impl<T, U> Into<U> for Twhere U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T, Outer> IsWrappedBy<Outer> for Twhere Outer: AsRef<T> + AsMut<T> + From<T>, T: From<Outer>,

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#### fn from_ref(outer: &Outer) -> &T

Get a reference to the inner from the outer.

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#### fn from_mut(outer: &mut Outer) -> &mut T

Get a mutable reference to the inner from the outer.

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### impl<T> LowerBounded for Twhere T: Bounded,

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#### fn min_value() -> T

Returns the smallest finite number this type can represent
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### impl<T> Pointable for T

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#### const ALIGN: usize = mem::align_of::<T>()

The alignment of pointer.
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#### type Init = T

The type for initializers.
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#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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### impl<T> Same<T> for T

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#### type Output = T

Should always be `Self`
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### impl<T> SaturatedConversion for T

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#### fn saturated_from<T>(t: T) -> Selfwhere Self: UniqueSaturatedFrom<T>,

Convert from a value of `T` into an equivalent instance of `Self`. Read more
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#### fn saturated_into<T>(self) -> Twhere Self: UniqueSaturatedInto<T>,

Consume self to return an equivalent value of `T`. Read more
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### impl<T> ToOwned for Twhere T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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### impl<S, T> UncheckedInto<T> for Swhere T: UncheckedFrom<S>,

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#### fn unchecked_into(self) -> T

The counterpart to `unchecked_from`.
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### impl<T, S> UniqueSaturatedFrom<T> for Swhere S: TryFrom<T> + Bounded,

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#### fn unique_saturated_from(t: T) -> S

Convert from a value of `T` into an equivalent instance of `Self`.
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### impl<T, S> UniqueSaturatedInto<T> for Swhere T: Bounded, S: TryInto<T>,

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#### fn unique_saturated_into(self) -> T

Consume self to return an equivalent value of `T`.
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### impl<T> UpperBounded for Twhere T: Bounded,

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#### fn max_value() -> T

Returns the largest finite number this type can represent
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### impl<T> WithSubscriber for T

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#### fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
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#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
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