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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/mod.rs
+7
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@@ -366,6 +366,13 @@ pub trait StorageDoubleMap<K1: FullEncode, K2: FullEncode, V: FullCodec> {
KArg2: EncodeLike<K2>,
F: FnOnce(&mut Self::Query) -> Result<R, E>;
/// Mutate the value under the given keys. Deletes the item if mutated to a `None`.
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;
/// Mutate the item, only if an `Ok` value is returned. Deletes the item if mutated to a `None`.
fn try_mutate_exists<KArg1, KArg2, R, E, F>(k1: KArg1, k2: KArg2, f: F) -> Result<R, E>
where