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Add swap and decode_len to DoubleMap finishing #3749 (#4264)

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* Add `swap` and `decode_len` to `DoubleMap`

*  Add tests to `swap` and `decode_len` for `DoubleMap` (WIP)

* Address review comments

* Remove function that is not in scope

* fix test

* better naming
This commit is contained in:
thiolliere
2019-12-02 13:01:29 +01:00
committed by Bastian Köcher
parent 810ac845b5
commit 22c00ff424
5 changed files with 109 additions and 2 deletions
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substrate/frame/support/src/storage/mod.rs
+21
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@@ -284,6 +284,14 @@ pub trait StorageDoubleMap<K1: FullEncode, K2: FullEncode, V: FullCodec> {
KArg1: EncodeLike<K1>,
KArg2: EncodeLike<K2>;
/// Swap the values of two key-pairs.
fn swap<XKArg1, XKArg2, YKArg1, YKArg2>(x_k1: XKArg1, x_k2: XKArg2, y_k1: YKArg1, y_k2: YKArg2)
where
XKArg1: EncodeLike<K1>,
XKArg2: EncodeLike<K2>,
YKArg1: EncodeLike<K1>,
YKArg2: EncodeLike<K2>;
fn insert<KArg1, KArg2, VArg>(k1: KArg1, k2: KArg2, val: VArg)
where
KArg1: EncodeLike<K1>,
@@ -330,4 +338,17 @@ pub trait StorageDoubleMap<K1: FullEncode, K2: FullEncode, V: FullCodec> {
V: EncodeAppend<Item=Item>,
Items: IntoIterator<Item=EncodeLikeItem> + Clone + EncodeLike<V>,
Items::IntoIter: ExactSizeIterator;
/// Read the length of the value in a fast way, without decoding the entire value.
///
/// `V` is required to implement `Codec::DecodeLength`.
///
/// Note that `0` is returned as the default value if no encoded value exists at the given key.
/// Therefore, this function cannot be used as a sign of _existence_. use the `::exists()`
/// function for this purpose.
fn decode_len<KArg1, KArg2>(key1: KArg1, key2: KArg2) -> Result<usize, &'static str>
where
KArg1: EncodeLike<K1>,
KArg2: EncodeLike<K2>,
V: codec::DecodeLength + Len;
}