phf 0.7.24

Runtime support for perfect hash function data structures

Compile-time generated maps and sets.

The phf::Map and phf::Set types have roughly comparable performance to a standard hash table, but can be generated as compile-time static values.

Usage

If the macros Cargo feature is enabled, the phf_map, phf_set, phf_ordered_map, and phf_ordered_set macros can be used to construct the PHF type. This currently requires a nightly compiler.

[dependencies]
phf = { version = "0.7.24", features = ["macros"] }
#![feature(proc_macro_hygiene)]

use phf::{phf_map, phf_set};

static MY_MAP: phf::Map<&'static str, u32> = phf_map! {
    "hello" => 1,
    "world" => 2,
};

static MY_SET: phf::Set<&'static str> = phf_set! {
    "hello world",
    "hola mundo",
};

fn main() {
    assert_eq!(MY_MAP["hello"], 1);
    assert!(MY_SET.contains("hello world"));
}

Alternatively, you can use the phf_codegen crate to generate PHF datatypes in a build script. This method can be used with a stable compiler.