pub struct VoterSet<Id: Eq + Ord> { /* private fields */ }
Expand description

A (non-empty) set of voters and associated weights.

A VoterSet identifies all voters that are permitted to vote in a round of the protocol and their associated weights. A VoterSet is furthermore equipped with a total order, given by the ordering of the voter’s IDs.

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impl<Id: Eq + Ord> VoterSet<Id>

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pub fn new<I>(weights: I) -> Option<Self>where Id: Ord + Clone, I: IntoIterator<Item = (Id, u64)>,

Create a voter set from a weight distribution produced by the given iterator.

If the distribution contains multiple weights for the same voter ID, they are understood to be partial weights and are accumulated. As a result, the order in which the iterator produces the weights is irrelevant.

Returns None if the iterator does not yield a valid voter set, which is the case if it either produced no non-zero weights or, i.e. the voter set would be empty, or if the total voter weight exceeds u64::MAX.

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pub fn get(&self, id: &Id) -> Option<&VoterInfo>

Get the voter info for the voter with the given ID, if any.

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pub fn len(&self) -> NonZeroUsize

Get the size of the set.

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pub fn contains(&self, id: &Id) -> bool

Whether the set contains a voter with the given ID.

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pub fn nth_mod(&self, n: usize) -> (&Id, &VoterInfo)

Get the nth voter in the set, modulo the size of the set, as per the associated total order.

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pub fn nth(&self, n: usize) -> Option<(&Id, &VoterInfo)>

Get the nth voter in the set, if any.

Returns None if n >= len.

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pub fn threshold(&self) -> VoterWeight

Get the threshold vote weight required for supermajority w.r.t. this set of voters.

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pub fn total_weight(&self) -> VoterWeight

Get the total weight of all voters.

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pub fn iter(&self) -> impl Iterator<Item = (&Id, &VoterInfo)>

Get an iterator over the voters in the set, as given by the associated total order.

Trait Implementations§

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impl<Id: Clone + Eq + Ord> Clone for VoterSet<Id>

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fn clone(&self) -> VoterSet<Id>

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<Id: Debug + Eq + Ord> Debug for VoterSet<Id>

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

Formats the value using the given formatter. Read more
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impl<Id: PartialEq + Eq + Ord> PartialEq<VoterSet<Id>> for VoterSet<Id>

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fn eq(&self, other: &VoterSet<Id>) -> 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<Id: Eq + Eq + Ord> Eq for VoterSet<Id>

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impl<Id: Eq + Ord> StructuralEq for VoterSet<Id>

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impl<Id: Eq + Ord> StructuralPartialEq for VoterSet<Id>

Auto Trait Implementations§

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impl<Id> RefUnwindSafe for VoterSet<Id>where Id: RefUnwindSafe,

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impl<Id> Send for VoterSet<Id>where Id: Send,

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impl<Id> Sync for VoterSet<Id>where Id: Sync,

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impl<Id> Unpin for VoterSet<Id>where Id: Unpin,

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impl<Id> UnwindSafe for VoterSet<Id>where Id: UnwindSafe,

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> Conv for T

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fn conv<T>(self) -> Twhere Self: Into<T>,

Converts self into T using Into<T>. Read more
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impl<T> FmtForward for T

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fn fmt_binary(self) -> FmtBinary<Self>where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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fn fmt_display(self) -> FmtDisplay<Self>where Self: Display,

Causes self to use its Display implementation when Debug-formatted.
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fn fmt_lower_exp(self) -> FmtLowerExp<Self>where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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fn fmt_lower_hex(self) -> FmtLowerHex<Self>where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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fn fmt_octal(self) -> FmtOctal<Self>where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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fn fmt_pointer(self) -> FmtPointer<Self>where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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fn fmt_upper_exp(self) -> FmtUpperExp<Self>where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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fn fmt_upper_hex(self) -> FmtUpperHex<Self>where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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fn fmt_list(self) -> FmtList<Self>where &'a Self: for<'a> IntoIterator,

Formats each item in a sequence. 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, 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> Pipe for Twhere T: ?Sized,

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fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> Rwhere Self: Sized,

Pipes by value. This is generally the method you want to use. Read more
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Borrows self and passes that borrow into the pipe function. Read more
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fn pipe_ref_mut<'a, R>(&'a mut self, func: impl FnOnce(&'a mut Self) -> R) -> Rwhere R: 'a,

Mutably borrows self and passes that borrow into the pipe function. Read more
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Borrows self, then passes self.borrow() into the pipe function. Read more
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Borrows self, then passes self.as_ref() into the pipe function.
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Mutably borrows self, then passes self.as_mut() into the pipe function.
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Borrows self, then passes self.deref() into the pipe function.
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fn pipe_deref_mut<'a, T, R>( &'a mut self, func: impl FnOnce(&'a mut T) -> R ) -> Rwhere Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

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fn tap(self, func: impl FnOnce(&Self)) -> Self

Immutable access to a value. Read more
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fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self

Mutable access to a value. Read more
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fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Selfwhere Self: Borrow<B>, B: ?Sized,

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fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Selfwhere Self: DerefMut<Target = T> + Deref, T: ?Sized,

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fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self

Calls .tap() only in debug builds, and is erased in release builds.
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fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self

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Calls .tap_borrow() only in debug builds, and is erased in release builds.
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Calls .tap_borrow_mut() only in debug builds, and is erased in release builds.
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Calls .tap_ref() only in debug builds, and is erased in release builds.
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Calls .tap_deref() only in debug builds, and is erased in release builds.
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fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Selfwhere Self: DerefMut<Target = T> + Deref, T: ?Sized,

Calls .tap_deref_mut() only in debug builds, and is erased in release builds.
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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)

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impl<T> TryConv for T

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type Error = Infallible

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Performs the conversion.
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type Error = <U as TryFrom<T>>::Error

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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.