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Add mutate_exists to StorageDoubleMap. (#6704)

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This commit is contained in:
Shaopeng Wang
2020-08-04 20:02:24 +12:00
committed by GitHub
parent c7d6a11460
commit 3a853d4dde
3 changed files with 33 additions and 0 deletions
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substrate/frame/support/src/storage/generator/double_map.rs
+9
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@@ -228,6 +228,15 @@ impl<K1, K2, V, G> storage::StorageDoubleMap<K1, K2, V> for G where
Self::try_mutate(k1, k2, |v| Ok::<R, Never>(f(v))).expect("`Never` can not be constructed; qed")
}
fn mutate_exists<KArg1, KArg2, R, F>(k1: KArg1, k2: KArg2, f: F) -> R
where
KArg1: EncodeLike<K1>,
KArg2: EncodeLike<K2>,
F: FnOnce(&mut Option<V>) -> R,
{
Self::try_mutate_exists(k1, k2, |v| Ok::<R, Never>(f(v))).expect("`Never` can not be constructed; qed")
}
fn try_mutate<KArg1, KArg2, R, E, F>(k1: KArg1, k2: KArg2, f: F) -> Result<R, E> where
KArg1: EncodeLike<K1>,
KArg2: EncodeLike<K2>,