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Implement macro for session change trait over arbitrary tuples (limit 19) (#1177)

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* Implement macro for session change trait

* Consolidate tuple macro into one
This commit is contained in:
Drew Stone
2018-11-30 18:26:24 +02:00
committed by Bastian Köcher
parent 1dc56b48ab
commit 2327b213e2
1 changed files with 27 additions and 10 deletions
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substrate/srml/session/src/lib.rs
+27 -10
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@@ -51,19 +51,36 @@ pub trait OnSessionChange<T> {
fn on_session_change(time_elapsed: T, should_reward: bool);
}
impl<T> OnSessionChange<T> for () {
fn on_session_change(_: T, _: bool) {}
}
impl<T, A, B> OnSessionChange<T> for (A, B)
where T: Clone, A: OnSessionChange<T>, B: OnSessionChange<T>
{
fn on_session_change(time_elapsed: T, should_reward: bool) {
A::on_session_change(time_elapsed.clone(), should_reward);
B::on_session_change(time_elapsed, should_reward);
macro_rules! for_each_tuple {
($m:ident) => {
for_each_tuple! { @IMPL $m !! A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, }
};
(@IMPL $m:ident !!) => { $m! { } };
(@IMPL $m:ident !! $h:ident, $($t:ident,)*) => {
$m! { $h $($t)* }
for_each_tuple! { @IMPL $m !! $($t,)* }
}
}
macro_rules! impl_session_change {
() => (
impl<T> OnSessionChange<T> for () {
fn on_session_change(_: T, _: bool) {}
}
);
( $($t:ident)* ) => {
impl<T: Clone, $($t: OnSessionChange<T>),*> OnSessionChange<T> for ($($t,)*) {
fn on_session_change(time_elapsed: T, should_reward: bool) {
$($t::on_session_change(time_elapsed.clone(), should_reward);)*
}
}
}
}
for_each_tuple!(impl_session_change);
pub trait Trait: timestamp::Trait {
type ConvertAccountIdToSessionKey: Convert<Self::AccountId, Self::SessionKey>;
type OnSessionChange: OnSessionChange<Self::Moment>;