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Simplify some Option / Result / ? operator patterns (#8653)

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* Simplify some Option / Result / ? operator patterns

When those match a combinator exactly.

Tool-aided by [comby-rust](https://github.com/huitseeker/comby-rust).

* adjust after review

* adjust post-review
This commit is contained in:
François Garillot
2021-04-23 09:36:10 -04:00
committed by GitHub
parent 541692c4a8
commit 052be8bbef
37 changed files with 77 additions and 188 deletions
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substrate/frame/support/src/storage/generator/value.rs
+2 -4
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@@ -77,10 +77,8 @@ impl<T: FullCodec, G: StorageValue<T>> storage::StorageValue<T> for G {
let key = Self::storage_value_final_key();
// attempt to get the length directly.
let maybe_old = match unhashed::get_raw(&key) {
Some(old_data) => Some(O::decode(&mut &old_data[..]).map_err(|_| ())?),
None => None,
};
let maybe_old = unhashed::get_raw(&key)
.map(|old_data| O::decode(&mut &old_data[..]).map_err(|_| ())).transpose()?;
let maybe_new = f(maybe_old);
if let Some(new) = maybe_new.as_ref() {
new.using_encoded(|d| unhashed::put_raw(&key, d));