[−][src]Trait shardio::SortKey
Specify a key function from data items of type T
to a sort key of type Key
.
Impelment this trait to create a custom sort order.
The function sort_key
returns a Cow
so that we abstract over Owned or
Borrowed data.
extern crate shardio; use shardio::*; use std::borrow::Cow; // The default sort order for DataStruct will be by field1. #[derive(Ord, PartialOrd, Eq, PartialEq)] struct DataStruct { field1: usize, field2: String, } // Define a marker struct for your new sort order struct Field2SortKey; // Define the new sort key by extracting field2 from DataStruct impl SortKey<DataStruct> for Field2SortKey { type Key = String; fn sort_key(t: &DataStruct) -> Cow<String> { Cow::Borrowed(&t.field2) } }
Associated Types
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impl<T> SortKey<T> for DefaultSort where
T: Ord + Clone,
[src]
T: Ord + Clone,