Macro phf_map 

phf_map!() { /* proc-macro */ }

Macro to create a static (compile-time) Map.

Requires the macros feature.

Supported key expressions are:

• literals: bools, (byte) strings, bytes, chars, and integers (integer literals in the first key’s type shape must have suffixes; later unsuffixed integers infer from the same position in that first key)
• arrays of u8 integer literals
• tuples of any supported key expressions, up to 12 elements
• dereferenced byte string literals
• OR patterns using | to map multiple keys to the same value
• UniCase::unicode(string), UniCase::ascii(string), or Ascii::new(string) if the unicase feature is enabled
• UncasedStr::new(string) if the uncased feature is enabled

All keys must use the same supported key expression type as the first key.

Example

use phf::{phf_map, Map};

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

fn main () {
    assert_eq!(MY_MAP["hello"], 1);
}

OR Patterns

You can use OR patterns to map multiple keys to the same value:

use phf::{phf_map, Map};

static OPERATORS: Map<&'static str, &'static str> = phf_map! {
    "+" | "add" | "plus" => "addition",
    "-" | "sub" | "minus" => "subtraction",
    "*" | "mul" | "times" => "multiplication",
};

fn main() {
    assert_eq!(OPERATORS["+"], "addition");
    assert_eq!(OPERATORS["add"], "addition");
    assert_eq!(OPERATORS["plus"], "addition");
}