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mutate_exists for StorageValue with ValueQuery (#13245)

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* mutate_exists for StorageValue with ValueQuery

Signed-off-by: muraca <mmuraca247@gmail.com>

* added `#[crate::storage_alias]` to tests

Signed-off-by: muraca <mmuraca247@gmail.com>

* added StorageEntryMetadata

Signed-off-by: muraca <mmuraca247@gmail.com>

* Update frame/support/src/lib.rs

---------

Signed-off-by: muraca <mmuraca247@gmail.com>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
This commit is contained in:
Matteo Muraca
2023-01-28 00:47:17 +01:00
committed by GitHub
parent c9361bed1a
commit a9277002b9
4 changed files with 105 additions and 0 deletions
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substrate/frame/support/src/storage/mod.rs
+6
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@@ -114,6 +114,12 @@ pub trait StorageValue<T: FullCodec> {
/// Mutate the value if closure returns `Ok`
fn try_mutate<R, E, F: FnOnce(&mut Self::Query) -> Result<R, E>>(f: F) -> Result<R, E>;
/// Mutate the value. Deletes the item if mutated to a `None`.
fn mutate_exists<R, F: FnOnce(&mut Option<T>) -> R>(f: F) -> R;
/// Mutate the value if closure returns `Ok`. Deletes the item if mutated to a `None`.
fn try_mutate_exists<R, E, F: FnOnce(&mut Option<T>) -> Result<R, E>>(f: F) -> Result<R, E>;
/// Clear the storage value.
fn kill();