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Introduce default-setting prime for collective (#5137)

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* Introduce default-setting prime for collective

* Docs.

* Elections phragmen supports prime

* Fix

* Membership supports prime

* Fix

* Update frame/collective/src/lib.rs

Co-Authored-By: Shawn Tabrizi <shawntabrizi@gmail.com>

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
This commit is contained in:
Gavin Wood
2020-03-05 15:57:03 +01:00
committed by GitHub
parent d3208aa7bc
commit 0573f1408d
7 changed files with 399 additions and 50 deletions
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substrate/frame/support/src/traits.rs
+12
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@@ -808,6 +808,8 @@ impl WithdrawReasons {
pub trait ChangeMembers<AccountId: Clone + Ord> {
/// A number of members `incoming` just joined the set and replaced some `outgoing` ones. The
/// new set is given by `new`, and need not be sorted.
///
/// This resets any previous value of prime.
fn change_members(incoming: &[AccountId], outgoing: &[AccountId], mut new: Vec<AccountId>) {
new.sort_unstable();
Self::change_members_sorted(incoming, outgoing, &new[..]);
@@ -817,6 +819,8 @@ pub trait ChangeMembers<AccountId: Clone + Ord> {
/// new set is thus given by `sorted_new` and **must be sorted**.
///
/// NOTE: This is the only function that needs to be implemented in `ChangeMembers`.
///
/// This resets any previous value of prime.
fn change_members_sorted(
incoming: &[AccountId],
outgoing: &[AccountId],
@@ -825,6 +829,8 @@ pub trait ChangeMembers<AccountId: Clone + Ord> {
/// Set the new members; they **must already be sorted**. This will compute the diff and use it to
/// call `change_members_sorted`.
///
/// This resets any previous value of prime.
fn set_members_sorted(new_members: &[AccountId], old_members: &[AccountId]) {
let (incoming, outgoing) = Self::compute_members_diff(new_members, old_members);
Self::change_members_sorted(&incoming[..], &outgoing[..], &new_members);
@@ -865,14 +871,20 @@ pub trait ChangeMembers<AccountId: Clone + Ord> {
}
(incoming, outgoing)
}
/// Set the prime member.
fn set_prime(_prime: Option<AccountId>) {}
}
impl<T: Clone + Ord> ChangeMembers<T> for () {
fn change_members(_: &[T], _: &[T], _: Vec<T>) {}
fn change_members_sorted(_: &[T], _: &[T], _: &[T]) {}
fn set_members_sorted(_: &[T], _: &[T]) {}
fn set_prime(_: Option<T>) {}
}
/// Trait for type that can handle the initialization of account IDs at genesis.
pub trait InitializeMembers<AccountId> {
/// Initialize the members to the given `members`.