Crate ordinal_map 

The library provides Ordinal trait to map types to usize values, proc-macro to derive Ordinal trait for structs and enums, and map and set implementations that use these types as keys efficiently.

Example

use ordinal_map::map::total::OrdinalTotalMap;
#[derive(ordinal_map::Ordinal)]
enum ErrorCategory {
    Network,
    Disk,
    Logic,
}

fn classify_error(error: &str) -> ErrorCategory {
    // ...
}

let mut error_counts: OrdinalTotalMap<ErrorCategory, u64> = OrdinalTotalMap::default();

for error in &errors {
    let category = classify_error(error);
    error_counts[&category] += 1;
}

Modules

map

Constant time lookup map implementations where keys implement the Ordinal trait.

set

Constant time lookup set implementations where entries implement the Ordinal trait.

Structs

AtomicOrdinal

Ordinal stored in AtomicUsize.

OrdinalValues

Iterator over Ordinal values.

Traits

Ordinal

Two-way map from a type to usize range from 0..ORDINAL_SIZE.

Derive Macros

Ordinal

Derive Ordinal for structs or enums.