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docs: Rephrase EnumerableStorageMap comment in Rustdocs (#2647)

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Luke Schoen authored and Bastian Köcher committed 2019-05-22 09:18:18 +02:00
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commit 1ce221f0d8
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substrate/srml/support/src/storage/mod.rs
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@@ -332,8 +332,8 @@ impl<K: Codec, V: Codec, U> StorageMap<K, V> for U where U: hashed::generator::S
/// A storage map that can be enumerated.
///
/// Note that type is primarily useful for off-chain computations.
/// Runtime implementors should avoid enumerating storage entries.
/// Primarily useful for off-chain computations.
/// Runtime implementors should avoid enumerating storage entries on-chain.
pub trait EnumerableStorageMap<K: Codec, V: Codec>: StorageMap<K, V> {
/// Return current head element.
fn head() -> Option<K>;