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Relax BoundedVec trait restrictions (#8749)

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* requiring users to maintain an unchecked invariant is unsafe

* relax trait restrictions on BoundedVec<T, S>

A normal `Vec<T>` can do many things without any particular trait
bounds on `T`. This commit relaxes the bounds on `BoundedVec<T, S>`
to give it similar capabilities.
This commit is contained in:
Peter Goodspeed-Niklaus
2021-05-07 22:04:16 +02:00
committed by GitHub
parent 9e894ce135
commit b689790171
6 changed files with 156 additions and 115 deletions
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substrate/frame/support/src/storage/mod.rs
+3 -6
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@@ -20,10 +20,7 @@
use sp_core::storage::ChildInfo;
use sp_std::prelude::*;
use codec::{FullCodec, FullEncode, Encode, EncodeLike, Decode};
use crate::{
hash::{Twox128, StorageHasher, ReversibleStorageHasher},
traits::Get,
};
use crate::hash::{Twox128, StorageHasher, ReversibleStorageHasher};
use sp_runtime::generic::{Digest, DigestItem};
pub use sp_runtime::TransactionOutcome;
@@ -811,13 +808,13 @@ pub trait StorageDecodeLength: private::Sealed + codec::DecodeLength {
/// outside of this crate.
mod private {
use super::*;
use bounded_vec::{BoundedVecValue, BoundedVec};
use bounded_vec::BoundedVec;
pub trait Sealed {}
impl<T: Encode> Sealed for Vec<T> {}
impl<Hash: Encode> Sealed for Digest<Hash> {}
impl<T: BoundedVecValue, S: Get<u32>> Sealed for BoundedVec<T, S> {}
impl<T, S> Sealed for BoundedVec<T, S> {}
impl<K, V, S> Sealed for bounded_btree_map::BoundedBTreeMap<K, V, S> {}
}