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 method can be used with a stable compiler
(rustc
version 1.30+)
[]
= { = "0.7.24", = ["macros"] }
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)