Macro ident::impl_hash_identity

macro_rules! impl_hash_identity {
    (($type:tt, $hasher:tt)) => { ... };
    (($type:tt, $hasher:tt) $($t:tt)*) => { ... };
    ($type:tt, $hasher:tt) => { ... };
}

A hash is often a useful and convenient identifier value.

This macro implements DeriveIdent<u64> for the passed type using the passed Hasher. (NOTE: the type must derive Hash)

Examples

#[macro_use]
extern crate ident;

use std::collections::hash_map::DefaultHasher;
use ident::*;

#[derive(Hash)]
struct MyType(pub usize);

//Implements DeriveIdent<u64> for MyType using DefaultHasher to calculate the hash.
impl_hash_identity!(MyType, DefaultHasher);

fn main() {
    let x = MyType(5);
    println!("{}", DeriveIdent::<u64>::derive_ident(&x));
}