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mutate returns a value (#945)

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* mutate returns a value

* code comment fixes

* fix the compile
This commit is contained in:
guanqun
2018-10-26 17:13:16 +08:00
committed by Gav Wood
parent 10210b9520
commit b1976c9014
3 changed files with 32 additions and 19 deletions
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substrate/srml/support/src/storage/mod.rs
+4 -4
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@@ -169,7 +169,7 @@ pub trait StorageValue<T: Codec> {
fn put<Arg: Borrow<T>>(val: Arg);
/// Mutate the value
fn mutate<F: FnOnce(&mut Self::Query)>(f: F);
fn mutate<R, F: FnOnce(&mut Self::Query) -> R>(f: F) -> R;
/// Clear the storage value.
fn kill();
@@ -193,7 +193,7 @@ impl<T: Codec, U> StorageValue<T> for U where U: generator::StorageValue<T> {
fn put<Arg: Borrow<T>>(val: Arg) {
U::put(val.borrow(), &RuntimeStorage)
}
fn mutate<F: FnOnce(&mut Self::Query)>(f: F) {
fn mutate<R, F: FnOnce(&mut Self::Query) -> R>(f: F) -> R {
U::mutate(f, &RuntimeStorage)
}
fn kill() {
@@ -296,7 +296,7 @@ pub trait StorageMap<K: Codec, V: Codec> {
fn remove<KeyArg: Borrow<K>>(key: KeyArg);
/// Mutate the value under a key.
fn mutate<KeyArg: Borrow<K>, F: FnOnce(&mut Self::Query)>(key: KeyArg, f: F);
fn mutate<KeyArg: Borrow<K>, R, F: FnOnce(&mut Self::Query) -> R>(key: KeyArg, f: F) -> R;
/// Take the value under a key.
fn take<KeyArg: Borrow<K>>(key: KeyArg) -> Self::Query;
@@ -329,7 +329,7 @@ impl<K: Codec, V: Codec, U> StorageMap<K, V> for U where U: generator::StorageMa
U::remove(key.borrow(), &RuntimeStorage)
}
fn mutate<KeyArg: Borrow<K>, F: FnOnce(&mut Self::Query)>(key: KeyArg, f: F) {
fn mutate<KeyArg: Borrow<K>, R, F: FnOnce(&mut Self::Query) -> R>(key: KeyArg, f: F) -> R {
U::mutate(key.borrow(), f, &RuntimeStorage)
}