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Switch to new proc-macro crate for implementing traits for tuples (#3598)

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* Switch to new proc-macro crate for implementing traits for tuples

* Switch back to stable `Cargo.lock` format

* Reduce tuple number to match rusts default implementation
This commit is contained in:
Bastian Köcher
2019-09-11 19:10:02 +02:00
committed by GitHub
parent 433d752831
commit d136b8eb81
16 changed files with 139 additions and 306 deletions
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substrate/srml/support/src/traits.rs
+1 -20
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@@ -24,8 +24,6 @@ use primitives::u32_trait::Value as U32;
use crate::sr_primitives::traits::{MaybeSerializeDebug, SimpleArithmetic, Saturating};
use crate::sr_primitives::ConsensusEngineId;
use super::for_each_tuple;
/// Anything that can have a `::len()` method.
pub trait Len {
/// Return the length of data type.
@@ -63,29 +61,12 @@ impl<V: PartialEq, T: Get<V>> Contains<V> for T {
}
/// The account with the given id was killed.
#[impl_trait_for_tuples::impl_for_tuples(30)]
pub trait OnFreeBalanceZero<AccountId> {
/// The account was the given id was killed.
fn on_free_balance_zero(who: &AccountId);
}
macro_rules! impl_on_free_balance_zero {
() => (
impl<AccountId> OnFreeBalanceZero<AccountId> for () {
fn on_free_balance_zero(_: &AccountId) {}
}
);
( $($t:ident)* ) => {
impl<AccountId, $($t: OnFreeBalanceZero<AccountId>),*> OnFreeBalanceZero<AccountId> for ($($t,)*) {
fn on_free_balance_zero(who: &AccountId) {
$($t::on_free_balance_zero(who);)*
}
}
}
}
for_each_tuple!(impl_on_free_balance_zero);
/// Trait for a hook to get called when some balance has been minted, causing dilution.
pub trait OnDilution<Balance> {
/// Some `portion` of the total balance just "grew" by `minted`. `portion` is the pre-growth